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rhodosperm
rhodosperm n. 
/ˈroʊdoʊˌspərm/ Botany (now rare) any alga of the former class Rhodospermeae (now called Rhodophyceae); a red alga.
Brit. /ˈrəʊdə(ʊ)spəːm/
, /ˈrəʊdə(ʊ)spəːm/U.S. /ˈroʊdəˌspərm/
, /ˈroʊdəˌspərm//ˈroʊdoʊˌspərm/ΘΚΠ
the world > plants > particular plants > algae > [noun] > red algae
red alga1834
rhodosperm1847
dough balls1876
lithothamnion1895
rhodophyte1932
1847 W. H. Harvey Nereis Australis 4 The Rhodosperms are remarkable for possessing what seems to be a double system of fructification, a thing without parallel in the Vegetable Kingdom.
1866 J. Lindley & T. Moore Treasury Bot. II. 978/1 The Rhodosperms form one of the three great divisions of Algæ.
1903 W. S. Furneaux Sea Shore xv. 358 We will now proceed to examine some of the best known..of the rhodosperms, beginning with the order Ceramiaceæ, which contains a number of red..weeds with jointed thread-like fronds.
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