Bryophytes - Research Article from Macmillan Science Library: Plant Sciences

This encyclopedia article consists of approximately 7 pages of information about Bryophytes.
This section contains 1,910 words
(approx. 7 pages at 300 words per page)
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Liverworts and Hornworts

Liverworts.

Liverwort sporophytes develop completely enclosed within gametophyte tissues until their capsules are ready to open. The seta, which is initially very short, consists of small, thin-walled hyaline cells. Just prior to capsule opening, the seta cells lengthen, thereby increasing the length of the seta up to twenty times its original dimensions. This rapid elongation pushes the darkly pigmented capsule and upper part of the whitish seta out of the gametophytic tissues. With drying, the capsule opens by splitting into four segments, or valves. The spores are dispersed into the winds by the twisting motions of numerous intermixed sterile cells called elaters. In contrast to mosses, which disperse their spores over several days, liverworts disperse the entire spore mass of a single capsule in just a few minutes.

Hornworts.

Hornworts resemble some liverworts in having simple, unspecialized thalloid gametophytes, but they differ in many other characters...

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This section contains 1,910 words
(approx. 7 pages at 300 words per page)
Buy the Bryophytes Encyclopedia Article
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Macmillan Science Library: Plant Sciences
Bryophytes from Macmillan Science Library: Plant Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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