thallusn.
/ˈθaləs/, U.S. /ˈθæləs/ Botany.
A vegetable structure without vascular tissue, in which there is no differentiation into stem and leaves, and from which true roots are absent.
ΘΚΠ
the world > plants > part of plant > reproductive part(s) > spore or sporule > cryptogam or plant having spores > [noun] > parts of > thallus
thallus1829
proembryo1854
prothallus1854
protonema1857
prothallium1858
thallome1875
blastema1880
prothallus1921
1829 J. C. Loudon Encycl. Plants 874 Lichenes... The thallus..is either pulverulent, crustaceous, membranous, foliaceous, or branched and shrub-like.
1846 J. Lindley Veg. Kingdom 2 A thallus is a fusion of root, stem and leaves, into one general mass.
1854 H. D. Thoreau Walden 326 The laciniated lobed and imbricated thalluses of some lichens.
1875 J. H. Balfour in Encycl. Brit. I. 508/1 Algæ..consist of a brown, red, or green, flattened, cellular, leaf-like expansion, called a thallus.
Compounds
attributive and in other combinations.
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1861 R. Bentley Man. Bot. i. ii. 67 Such are..termed Cormophytes or stem-producing plants, to distinguish them from the thallus-forming plants or Thallophytes.
1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 160 The flat extension of the thallus or thallus-like stem.
1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 130 In contradistinction to Thallus-plants (Thallophytes), all plants in which leaves can be..distinguished might be termed Phyllophytes.
This entry has not yet been fully updated (first published 1912; most recently modified version published online March 2022).
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n.1829