thallus

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thal·lus

 (thăl′əs)
n. pl. thal·li (thăl′ī) or thal·lus·es
1. A plant body undifferentiated into stem, root, or leaf.
2. The main body of an alga, fungus, or lichen.

[Latin, green stalk, from Greek thallos, from thallein, to sprout.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

thallus

(ˈθæləs)
n, pl thalli (ˈθælaɪ) or thalluses
(Biology) the undifferentiated vegetative body of algae, fungi, and lichens
[C19: from Latin, from Greek thallos green shoot, from thallein to bloom]
ˈthalloid adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

thal•lus

(ˈθæl əs)

n., pl. thal•li (ˈθæl aɪ) thal•lus•es.
a simple vegetative body undifferentiated into true leaves, stem, and root, ranging from an aggregation of filaments to a complex plantlike form.
[1820–30; < New Latin < Greek thallós young shoot, twig]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

thal·lus

(thăl′əs)
Plural thalli (thăl′ī)
A part of certain plants and plant-like organisms that is a single cell or a mass of cells and cannot be distinguished as a leaf, stem, or root. Fungi, lichens, liverworts, and most algae have thalli.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

thallus

A type of plant that is not separated into stem, leaves, and roots.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.thallus - a plant body without true stems or roots or leaves or vascular systemthallus - a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes
crustose thallus - thin crusty lichen thallus; adheres closely to or is embedded in the surface on which it grows
plant part, plant structure - any part of a plant or fungus
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
References in classic literature ?
As it flows it takes the forms of sappy leaves or vines, making heaps of pulpy sprays a foot or more in depth, and resembling, as you look down on them, the laciniated, lobed, and imbricated thalluses of some lichens; or you are reminded of coral, of leopard's paws or birds' feet, of brains or lungs or bowels, and excrements of all kinds.
corticata enjoys a noticeable SG, this may be due to stands and thalluses are placed on bed for lining.
The belt thrives on steep slopes with little sunlight, forming a cornice or ledge (the "terrace" or "pavement") a meter or more in width, formed by the dead, cemented thalluses of coralline algae of the genus Lithophyllum.