thallophyte


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thal·lo·phyte

(thal'ō-fīt),
A member of the division Thallophyta.
Farlex Partner Medical Dictionary © Farlex 2012

thallophyte

(thăl′ə-fīt′)
n.
Any of a group of organisms, including the algae, fungi, and lichens, that show no differentiation into stem, root, or leaf and were formerly regarded as constituting a subkingdom of the plant kingdom.

thal′lo·phyt′ic (-fĭt′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

thallophyte

any plant of the group (or former division) Thallophyta, containing the most primative types of plants characterized by the possession of a THALLUS. They vary in size from unicellular types to giant seaweeds up to 75 m in length. The group includes Algae, Bacteria, Fungi, slime fungi (Myxomycetes) and lichens. The Thallophyta clearly have several different evolutionary origins and the term is not used in modern systematics.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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While the terminology of the units has still not been fixed, researchers mostly followed the procedures of the Braun-Blanquet approach: studied releves and described floristically delimited units for the thallophyte vegetation using the rank-indicating terminations of the ICPN (-etum, -ion, -alia, -etea).
The extensive number of already described thallophyte syntaxa shows that construction of a meaningful syntaxonomic system for the thallophytic vegetation is feasible (see also WILMANNS, 1998).
In Pringsheim's (1876b) experience, the first neutral generation of thallophytes (i.e., the spore-producing thallus that develops from the fertilized egg) often proceeded directly to spore-production, with greater or lesser suppression of the vegetative parts relative to subsequent neutral generations.
Homologous alternation occurred in most thallophytes and "might be described as a mere differentiation--often a very slight one--of successive gametophytes." In support of his theory, Bower disputed the hitherto generally accepted homology between the zoospores of thallophytes and the spores of archegoniates.
A consideration of the evolutionary and taxonomic significance of some biochemical, micromorphological and physiological characteristics in the Thallophytes. Q.