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A plant body that is not differentiated into special tissue systems or organs and may vary from a single cell to a complex, branching multicellular structure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the body of lower plants (algae, fungi, myxomycetes, lichens). A thallus is not differentiated into stem and leaves. Thalli are characteristic of thallophytes.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Similarly, Agarum clathratum and Saccharina longicruris, as well as a cadre of small thalloid and filamentous species, are also absent from the Boulder Patch flora.
It is probable that several relatively conspicuous subarctic and boreal thalloid species will experience range shifts (e.g., Chordaria flagelliformis, Petalonia fascia, Saccorhiza dermatodea, Agarum clathratum, Saccharina longicruris).
Three basic forms of gametophyte organization occur among the liverworts, commonly referred to as complex thalloid, simple thalloid, and leafy body plans.
The leafy and simple thalloid liverworts have quadrilobed sporocytes, whereas the sporocytes of complex thalloids are generally unlobed.
The complex thalloid liverworts (Marchantiopsida) are an early divergent and highly evolved group of organisms.
Such pre-meiotic bands of microtubules have been reported in deeply lobed, polyplastidic sporocytes of both simple thalloid (Brown & Lemmon, 2004, 2006) and leafy (Brown & Lemmon, 2009) liverworts.
The Fossombroniales are a specialized group of simple thalloids in which the thalli are marginally dissected into leafy appendages that appear ruffled to the naked eye.