Evolution of stelar system in gymnosperm
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“The stele is defined as a central vascular cylinder, with or without pith and delimited the cortex by endodermis.”
“In higher vascular plants (Pteridophytes, Gymnosperms and Angiosperms), the leaf traces are large, and it appears that they play an important role in the vascular system of axis. The whole setup of leaf traces appears as a composite structure in these plants.”
“The vascular plants have been divided into two groups on the basis of the presence or absence of the leaf gaps. The ferns, gymnosperms and angiosperms are included in Pteropsida. whereas the lycopods, horse-tails, etc., are included in Lycopsida.”
“In higher vascular plants (Pteridophytes, Gymnosperms and Angiosperms), the leaf traces are large, and it appears that they play an important role in the vascular system of axis. The whole setup of leaf traces appears as a composite structure in these plants.”
“The vascular plants have been divided into two groups on the basis of the presence or absence of the leaf gaps. The ferns, gymnosperms and angiosperms are included in Pteropsida. whereas the lycopods, horse-tails, etc., are included in Lycopsida.”
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