prothalloidadj.
/prəʊˈθalɔɪd/, U.S. /proʊˈθæˌlɔɪd/ Botany. Now rare.
Of the nature of or resembling a prothallus. Cf. prothallial adj.
ΘΚΠ
the world > plants > part of plant > reproductive part(s) > spore or sporule > cryptogam or plant having spores > [adjective] > of or having parts > of or having thallus
thalline1856
thalloid1857
thallodic1860
prothalline1868
thallodal1871
prothalloid1874
protonemal1875
prothallial1876
thalliform1891
protonematal1900
thalloidal1900
thallose1900
1874 Smithsonian Contrb. Knowl. 19 222 Thallus developing from a confervoid prothalloid filament.
1896 Amer. Naturalist 30 355 The expanded green prothalloid structure performed the same function.
1912 New Phytologist 11 306 In some, merely distorted remains of prothalloid leaves have been found, which afford little clue to their original arrangement.
1967 M. E. Hale Biol. Lichens i. 12 (caption) White non-lichenized prothalloid margin of Catillaria sulphurata.
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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adj.1874