Origin of prothallus
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for prothallus
With L. inundatum, however, the prothallus is green and leaf-like.
Malic acid has, however, been discovered to be present in the prothallus as a whole.
On the under side of the prothallus two kinds of organs appear (Fig. 510).The Elements of Botany
The prothallus is a small underground body destitute of chlorophyll.
Upon the prothallus, or somewhat sunken in it, the sexual organs appear.The Nursery Book
Liberty Hyde Bailey
- botany the small flat free-living gametophyte that bears the reproductive organs of ferns, horsetails, and club mosses. It is either a green disc on the soil surface or it is colourless and subterranean
C19: from New Latin, from pro- before + Greek thallus a young shoot
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- The gametophyte of homosporous ferns and some other plants. Prothalli have chlorophyll for photosynthesis, but they are not differentiated into roots, stems, or leaves. They are usually small, flat, and delicate. Prothalli develop from germinated spores, and they bear both archegonia for producing eggs and antheridia for producing sperm. See more at alternation of generations.
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