In plant anatomy and evolution a microphyll is a type of plantleaf with one single, unbranched leaf vein. Plants with microphyll leaves occur early in the fossil record, and few such plants exist today. In the classical concept of a microphyll, the leaf vein emerges from the protostele without leaving a leaf gap. Leaf gaps are small areas above the node of some leaves where there is no vascular tissue, as it has all been diverted to the leaf. Megaphylls, in contrast, have multiple veins within the leaf and leaf gaps above them in the stem.
Leaf vasculature
The clubmosses and horsetails have microphylls, as in all extant species there is only a single vascular trace in each leaf. Despite their name, microphylls are not always small: those of Isoëtes can reach 20–100 centimetres in length, and the extinct Lepidodendron bore microphylls up to 78 cm long.
Evolution
The enation theory of microphyll evolution posits that small outgrowths, or enations, developed from the side of early stems (such as those found in the Zosterophylls). Outgrowths of the protostele (the central vasculature) later emerged towards the enations (as in Asteroxylon), and eventually continued to grow fully into the leaf to form the mid-vein (such as in Baragwanathia). The fossil record appears to display these traits in this order, but this may be a coincidence, as the record is incomplete. The telome theory proposes instead that both microphylls and megaphylls originated by the reduction; microphylls by reduction of a single telome branch, and megaphylls by evolution from branched portions of a telome.
Video shows what microphyll means. A leaf having a single unbranched vein, or a structure that is derived from such a leaf.. A very small leaf. Microphyll Meaning. How to pronounce, definition audio dictionary. How to say microphyll. Powered by MaryTTS, Wiktionary
published: 27 Apr 2015
Microphyll and Macrophyll
published: 01 Nov 2022
How to Pronounce microphyll - American English
Learn how to say/pronounce microphyll in American English. Subscribe for more videos!
published: 13 Jan 2018
Microphyll Woodlands
published: 17 Jul 2018
Evolution of leaf | evolution of microphylls and megaphylls
#evolutionofleaf
#visiblescience
#alevelbiology
#mdcatbiology
#fscbiology
this lecture is about
EVOLUTION OF LEAF
Early vascular land plants did not have true leaves or roots. They were small in size, withdichotomously branched erect smooth aerial parts and equally strong subterranean anchoring
and absorptive rhizome.
Fig. 9.12 Cooksonia : an early vascular plant bearing sporangia at the tips of the branches.
Cooksonia (Fig. 9.12) had the same structural layout
i.e. naked stem without leaves. Such plants started
to form leaves as small scale like out growths.
These out growths were not supplied with vascular
tissues, therefore they were not regarded as true
leaves. Lycopods were the irst plants that formed
the true leaves and roots.
However in lycopods (e.g. Lyc...
published: 12 Feb 2023
Evolution of Microphyll
https://youtu.be/w-i4CdFb6Yc
published: 14 Feb 2022
LYCOPOD CLUBMOSSES & MICROPHYLL LEAVES
@drjahn41
published: 26 Oct 2023
Evolution Of Leaf | Microphyll | Megaphyll | Class 11
About This Channel.....................
I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I'm 100% correct in all my videos, but I do try to obtain the information from credible sources.
One-stop destination for all biology lectures.
_ students in class 11, 12 or appearing for competitive medical exams ( NMDCAT ) will find it very beneficial
_ The videos are categories under various heading to make the students life simplified
Visit My Other Channel Playlist .....................
NMDCAT PART 1: https://youtube.com/playlist?list=PLSXzOBvA_c1Mwe5KZtn9NXyHWPHvPTPG2
NMDCAT PART 2: https://youtube.com/playlist?list=PLSXzOBvA_c1MkXL0rEFZgTYI8rkpxYiZh
Class 11th Lectures: https://youtube.com/playlist?list=PLSXzOBvA_c1Mw...
published: 01 Dec 2022
How To Say Microphyll
Learn how to say Microphyll with EmmaSaying free pronunciation tutorials.
Definition and meaning can be found here:
https://www.google.com/search?q=define+Microphyll
Improve your English pronunciation with our short tutorials. Explore vowel and consonant sounds while perfecting your accent. Elevate your speaking fluency starting today!
published: 13 Nov 2017
Microphylls and Megaphylls with Diagram | D/B Micro and megaphylls in 1st year Biology
D/B Microphylls and Megaphylls
with diagram
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Video shows what microphyll means. A leaf having a single unbranched vein, or a structure that is derived from such a leaf.. A very small leaf. Microphyll Mean...
Video shows what microphyll means. A leaf having a single unbranched vein, or a structure that is derived from such a leaf.. A very small leaf. Microphyll Meaning. How to pronounce, definition audio dictionary. How to say microphyll. Powered by MaryTTS, Wiktionary
Video shows what microphyll means. A leaf having a single unbranched vein, or a structure that is derived from such a leaf.. A very small leaf. Microphyll Meaning. How to pronounce, definition audio dictionary. How to say microphyll. Powered by MaryTTS, Wiktionary
#evolutionofleaf
#visiblescience
#alevelbiology
#mdcatbiology
#fscbiology
this lecture is about
EVOLUTION OF LEAF
Early vascular land plants did not have t...
#evolutionofleaf
#visiblescience
#alevelbiology
#mdcatbiology
#fscbiology
this lecture is about
EVOLUTION OF LEAF
Early vascular land plants did not have true leaves or roots. They were small in size, withdichotomously branched erect smooth aerial parts and equally strong subterranean anchoring
and absorptive rhizome.
Fig. 9.12 Cooksonia : an early vascular plant bearing sporangia at the tips of the branches.
Cooksonia (Fig. 9.12) had the same structural layout
i.e. naked stem without leaves. Such plants started
to form leaves as small scale like out growths.
These out growths were not supplied with vascular
tissues, therefore they were not regarded as true
leaves. Lycopods were the irst plants that formed
the true leaves and roots.
However in lycopods (e.g. Lycopodium) the leaves
are small in size. Each leaf has a single undivided
vein (vascular supply). Such a leaf is called
microphyll.
Large leaves having divided veins and veinlets
with an expanded leaf blade or lamina are known as megaphylls. Megaphylls are characteristic
for ferns and seed plants. It is suggested that evolution of megaphylls started from a dichotomous
branching system in some primitive psilopsids approximately 350 million years ago. It is assumed
that evolution of a megaphyll included series of successive evolutionary steps (Fig. 9.13) which are
as follows Overtopping
The dichotomously branched aerial portion of the stem showed unequal branching. Some branches
remained short while others grew and expanded at a much faster pace. All these branches grew in
diferent planes. Such an unequal development of various branches is called overtopping.
Planation
Next important step was the arrangement of unequal dichotomies in one plane. This process is
termed as planation.
Fusion/Webbing
Overtopping and planation was followed by a process known as fusion or webbing. The space
between the overtopped dichotomous branches was occupied by a sheet of parenchyma cells
which connected these branches forming a lat lamina or leaf blade type of structure, having many
dichotomously branched veins (Fig. 9.13).
During the course of evolution fusion of the vascular strands resulted in net or reticulate venation
pattern. The process of evolution of leaf was very slow and gradual which completed in more than
15-20 million years.
#evolutionofleaf
#visiblescience
#alevelbiology
#mdcatbiology
#fscbiology
this lecture is about
EVOLUTION OF LEAF
Early vascular land plants did not have true leaves or roots. They were small in size, withdichotomously branched erect smooth aerial parts and equally strong subterranean anchoring
and absorptive rhizome.
Fig. 9.12 Cooksonia : an early vascular plant bearing sporangia at the tips of the branches.
Cooksonia (Fig. 9.12) had the same structural layout
i.e. naked stem without leaves. Such plants started
to form leaves as small scale like out growths.
These out growths were not supplied with vascular
tissues, therefore they were not regarded as true
leaves. Lycopods were the irst plants that formed
the true leaves and roots.
However in lycopods (e.g. Lycopodium) the leaves
are small in size. Each leaf has a single undivided
vein (vascular supply). Such a leaf is called
microphyll.
Large leaves having divided veins and veinlets
with an expanded leaf blade or lamina are known as megaphylls. Megaphylls are characteristic
for ferns and seed plants. It is suggested that evolution of megaphylls started from a dichotomous
branching system in some primitive psilopsids approximately 350 million years ago. It is assumed
that evolution of a megaphyll included series of successive evolutionary steps (Fig. 9.13) which are
as follows Overtopping
The dichotomously branched aerial portion of the stem showed unequal branching. Some branches
remained short while others grew and expanded at a much faster pace. All these branches grew in
diferent planes. Such an unequal development of various branches is called overtopping.
Planation
Next important step was the arrangement of unequal dichotomies in one plane. This process is
termed as planation.
Fusion/Webbing
Overtopping and planation was followed by a process known as fusion or webbing. The space
between the overtopped dichotomous branches was occupied by a sheet of parenchyma cells
which connected these branches forming a lat lamina or leaf blade type of structure, having many
dichotomously branched veins (Fig. 9.13).
During the course of evolution fusion of the vascular strands resulted in net or reticulate venation
pattern. The process of evolution of leaf was very slow and gradual which completed in more than
15-20 million years.
About This Channel.....................
I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I...
About This Channel.....................
I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I'm 100% correct in all my videos, but I do try to obtain the information from credible sources.
One-stop destination for all biology lectures.
_ students in class 11, 12 or appearing for competitive medical exams ( NMDCAT ) will find it very beneficial
_ The videos are categories under various heading to make the students life simplified
Visit My Other Channel Playlist .....................
NMDCAT PART 1: https://youtube.com/playlist?list=PLSXzOBvA_c1Mwe5KZtn9NXyHWPHvPTPG2
NMDCAT PART 2: https://youtube.com/playlist?list=PLSXzOBvA_c1MkXL0rEFZgTYI8rkpxYiZh
Class 11th Lectures: https://youtube.com/playlist?list=PLSXzOBvA_c1Mwe5KZtn9NXyHWPHvPTPG2
Class 12th Lectures: https://youtube.com/playlist?list=PLSXzOBvA_c1MkXL0rEFZgTYI8rkpxYiZh
Class 10th Lectures:
https://youtube.com/playlist?list=PLSXzOBvA_c1PzItWzs9PNc3R-ALvCCBd1
Subscribe My Channel:
https://youtube.com/c/ALIACADEMYA7R
Subscribe My other channel for federal and KPK board Lectures:
https://youtube.com/channel/UC5PnwruPWPetHvskbVOKHWQ
Social Link........................
Instagram:
https://instagram.com/ranaalibiologist?utm_medium=copy_linkIDENTICAL TWINs
About This Channel.....................
I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I'm 100% correct in all my videos, but I do try to obtain the information from credible sources.
One-stop destination for all biology lectures.
_ students in class 11, 12 or appearing for competitive medical exams ( NMDCAT ) will find it very beneficial
_ The videos are categories under various heading to make the students life simplified
Visit My Other Channel Playlist .....................
NMDCAT PART 1: https://youtube.com/playlist?list=PLSXzOBvA_c1Mwe5KZtn9NXyHWPHvPTPG2
NMDCAT PART 2: https://youtube.com/playlist?list=PLSXzOBvA_c1MkXL0rEFZgTYI8rkpxYiZh
Class 11th Lectures: https://youtube.com/playlist?list=PLSXzOBvA_c1Mwe5KZtn9NXyHWPHvPTPG2
Class 12th Lectures: https://youtube.com/playlist?list=PLSXzOBvA_c1MkXL0rEFZgTYI8rkpxYiZh
Class 10th Lectures:
https://youtube.com/playlist?list=PLSXzOBvA_c1PzItWzs9PNc3R-ALvCCBd1
Subscribe My Channel:
https://youtube.com/c/ALIACADEMYA7R
Subscribe My other channel for federal and KPK board Lectures:
https://youtube.com/channel/UC5PnwruPWPetHvskbVOKHWQ
Social Link........................
Instagram:
https://instagram.com/ranaalibiologist?utm_medium=copy_linkIDENTICAL TWINs
Learn how to say Microphyll with EmmaSaying free pronunciation tutorials.
Definition and meaning can be found here:
https://www.google.com/search?q=define+Micro...
Learn how to say Microphyll with EmmaSaying free pronunciation tutorials.
Definition and meaning can be found here:
https://www.google.com/search?q=define+Microphyll
Improve your English pronunciation with our short tutorials. Explore vowel and consonant sounds while perfecting your accent. Elevate your speaking fluency starting today!
Learn how to say Microphyll with EmmaSaying free pronunciation tutorials.
Definition and meaning can be found here:
https://www.google.com/search?q=define+Microphyll
Improve your English pronunciation with our short tutorials. Explore vowel and consonant sounds while perfecting your accent. Elevate your speaking fluency starting today!
Video shows what microphyll means. A leaf having a single unbranched vein, or a structure that is derived from such a leaf.. A very small leaf. Microphyll Meaning. How to pronounce, definition audio dictionary. How to say microphyll. Powered by MaryTTS, Wiktionary
#evolutionofleaf
#visiblescience
#alevelbiology
#mdcatbiology
#fscbiology
this lecture is about
EVOLUTION OF LEAF
Early vascular land plants did not have true leaves or roots. They were small in size, withdichotomously branched erect smooth aerial parts and equally strong subterranean anchoring
and absorptive rhizome.
Fig. 9.12 Cooksonia : an early vascular plant bearing sporangia at the tips of the branches.
Cooksonia (Fig. 9.12) had the same structural layout
i.e. naked stem without leaves. Such plants started
to form leaves as small scale like out growths.
These out growths were not supplied with vascular
tissues, therefore they were not regarded as true
leaves. Lycopods were the irst plants that formed
the true leaves and roots.
However in lycopods (e.g. Lycopodium) the leaves
are small in size. Each leaf has a single undivided
vein (vascular supply). Such a leaf is called
microphyll.
Large leaves having divided veins and veinlets
with an expanded leaf blade or lamina are known as megaphylls. Megaphylls are characteristic
for ferns and seed plants. It is suggested that evolution of megaphylls started from a dichotomous
branching system in some primitive psilopsids approximately 350 million years ago. It is assumed
that evolution of a megaphyll included series of successive evolutionary steps (Fig. 9.13) which are
as follows Overtopping
The dichotomously branched aerial portion of the stem showed unequal branching. Some branches
remained short while others grew and expanded at a much faster pace. All these branches grew in
diferent planes. Such an unequal development of various branches is called overtopping.
Planation
Next important step was the arrangement of unequal dichotomies in one plane. This process is
termed as planation.
Fusion/Webbing
Overtopping and planation was followed by a process known as fusion or webbing. The space
between the overtopped dichotomous branches was occupied by a sheet of parenchyma cells
which connected these branches forming a lat lamina or leaf blade type of structure, having many
dichotomously branched veins (Fig. 9.13).
During the course of evolution fusion of the vascular strands resulted in net or reticulate venation
pattern. The process of evolution of leaf was very slow and gradual which completed in more than
15-20 million years.
About This Channel.....................
I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I'm 100% correct in all my videos, but I do try to obtain the information from credible sources.
One-stop destination for all biology lectures.
_ students in class 11, 12 or appearing for competitive medical exams ( NMDCAT ) will find it very beneficial
_ The videos are categories under various heading to make the students life simplified
Visit My Other Channel Playlist .....................
NMDCAT PART 1: https://youtube.com/playlist?list=PLSXzOBvA_c1Mwe5KZtn9NXyHWPHvPTPG2
NMDCAT PART 2: https://youtube.com/playlist?list=PLSXzOBvA_c1MkXL0rEFZgTYI8rkpxYiZh
Class 11th Lectures: https://youtube.com/playlist?list=PLSXzOBvA_c1Mwe5KZtn9NXyHWPHvPTPG2
Class 12th Lectures: https://youtube.com/playlist?list=PLSXzOBvA_c1MkXL0rEFZgTYI8rkpxYiZh
Class 10th Lectures:
https://youtube.com/playlist?list=PLSXzOBvA_c1PzItWzs9PNc3R-ALvCCBd1
Subscribe My Channel:
https://youtube.com/c/ALIACADEMYA7R
Subscribe My other channel for federal and KPK board Lectures:
https://youtube.com/channel/UC5PnwruPWPetHvskbVOKHWQ
Social Link........................
Instagram:
https://instagram.com/ranaalibiologist?utm_medium=copy_linkIDENTICAL TWINs
Learn how to say Microphyll with EmmaSaying free pronunciation tutorials.
Definition and meaning can be found here:
https://www.google.com/search?q=define+Microphyll
Improve your English pronunciation with our short tutorials. Explore vowel and consonant sounds while perfecting your accent. Elevate your speaking fluency starting today!
In plant anatomy and evolution a microphyll is a type of plantleaf with one single, unbranched leaf vein. Plants with microphyll leaves occur early in the fossil record, and few such plants exist today. In the classical concept of a microphyll, the leaf vein emerges from the protostele without leaving a leaf gap. Leaf gaps are small areas above the node of some leaves where there is no vascular tissue, as it has all been diverted to the leaf. Megaphylls, in contrast, have multiple veins within the leaf and leaf gaps above them in the stem.
Leaf vasculature
The clubmosses and horsetails have microphylls, as in all extant species there is only a single vascular trace in each leaf. Despite their name, microphylls are not always small: those of Isoëtes can reach 20–100 centimetres in length, and the extinct Lepidodendron bore microphylls up to 78 cm long.
Evolution
The enation theory of microphyll evolution posits that small outgrowths, or enations, developed from the side of early stems (such as those found in the Zosterophylls). Outgrowths of the protostele (the central vasculature) later emerged towards the enations (as in Asteroxylon), and eventually continued to grow fully into the leaf to form the mid-vein (such as in Baragwanathia). The fossil record appears to display these traits in this order, but this may be a coincidence, as the record is incomplete. The telome theory proposes instead that both microphylls and megaphylls originated by the reduction; microphylls by reduction of a single telome branch, and megaphylls by evolution from branched portions of a telome.