containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta
The sporophyte is the plant which is differentiated into stem, leaf and root, which show a wonderful variety 01 form; the internal structure also shows increased complexity and variety as compared with the other group of vascular plants, the Pteridophyta.
If, as has been suggested by Bower, the strobiloid types are relatively primitive, the large-leaved Pteridophyta must be supposed to have arisenearly from such forms. The question cannot be discussed fully here, but enough has been said above to show that in the light of our present knowledge the ma
Another question of great interest, which can only be touched upon here and may fitly close the consideration of this division of the Vegetable Kingdom, concerns the evidence as to the derivation of higher groups from the Pteridophyta.
Polyploidy occurs in the heterosporous and homosporous Pteridophyta, but with a much higher frequency in the latter. Ninety-six percent of the homosporous Pteridophyta show a gametic chromos..צפה במאמר
Science
להוסיף Pteridophyta לפרטים
הפכים ל Pteridophyta
תודה על תרומה
תגובות על Pteridophyta
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Pteridophyta הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד
Pteridophyta הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד