nemathecium
殖瘤
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Nemathecium \Nem`a*the"ci*um\ (? or ?), n.; pl. {Nemathecia}.
[NL., fr. Gr. nh^ma a thread + ? a box.] (Bot.)
A peculiar kind of fructification on certain red alg[ae],
consisting of an external mass of filaments at length
separating into tetraspores.