|
Thu, Dec 20, 07 at 3:41
| what are some of them, in terms of leaf structure, vascular tissues, etc? Looking at some of the agathis and podocarpus species, they look so much more like angiosperms, like flowering trees, than gymnosperms. So, I wonder, what are some other differences between angiosperms and gymnosperms besides the obvious seed structure? How about leaf structure, vascular differences, etc. Anybody know? |
Follow-Up Postings:
|
| Gymnosperms (apart from Gnetophytes) don't have vessels in their xylem (wood); Angiosperms do. There are other differences, but it's a bit early in the morning for me to remember them all yet ;-) Otherwise, it is fairly tricky, as convergent evolution has resulted in many characters developing similar appearance as an optimum for various purposes, even though in structural development and origin they differ (e.g. alder 'cones', yew 'berries', broad-leaved Agathis leaves, needle-like Erica leaves, etc., etc.). Resin |
|
- Posted by fledgeling_ 4b SD (My Page) on Thu, Dec 20, 07 at 10:36
| The transporting tissue of Angiosperms are vessel elements. The Gymnosperms have a different structure, tracheids, that preform the same function. http://en.wikipedia.org/wiki/Tracheid The presence of resin canals, on the conifers that usually have them (Dont remember which do and which dont), are a dead giveaway. |
Please Note: Only registered members are able to post messages to this forum. If you are a member, please log in. If you aren't yet a member, join now!
Return to the Conifers Forum
Instructions
- You must be a registered member and logged in to post messages on our forums.
- Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review the contents and make changes.
- After posting your message, you may need to refresh the forum page in order to see it.
- It is illegal to post copyrighted material without the owner's consent.
- HTML codes are allowed in the message field only.
- No advertising is allowed in any of the forums.
- If you would like to practice posting or uploading photos, please visit our Test forum.
- If you need assistance, please Contact Us and we will be happy to help.