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- Title
OBSERVATIONS ON THE STRUCTURE AND BIOLOGY OF HAPLOMITRIUM AND TAKAKIA, HEPATICS WITH ROOTS.
- Authors
Grubb, P. J.
- Abstract
The gametophytes of certain species of Haplomitrium and of Takakia have organs that may be called roots. These normally grow downward, are almost colourless and, unlike flagella-shoots, have no leaf rudiments. They may have up to two orders of branching; they have no root-caps But are covered by mucilage if grown in dry conditions. The axes of most species have a central cylinder of elongated cells. In the aerial shools these cells generally appear 'empty' like the hydroids of mosses. The leaf cells have an outer layer which is relatively impermeable to water and solutes. Shoots of Haplomitrium mnioides are able to maintain their water balance more effectively than those of Plagiochila asplenioides under marginally drying conditions. The endohydric habit of Haplomitrium and Takakia appears to confer little advantage in the field because it is not coupled with a protoplasmic resistance to desiccation.
- Subjects
FERN gametophytes; HAPLOMITRIUM; PLANT roots; PLANT shoots; VESTIGIAL organs; MUCILAGE; PLAGIOCHILA; MOSSES
- Publication
New Phytologist, 1970, Vol 69, Issue 2, p303
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/j.1469-8137.1970.tb02430.x