nNemathecium(Bot) A peculiar kind of fructification on certain red algæ, consisting of an external mass of filaments at length separating into tetraspores.
Century Dictionary and Cyclopedia
nnematheciumA wart-like elevation developed on the surface of the thallus of some of the higher algæ (Florideæ), and ordinarily containing clusters of tetraspores mixed with barren hyphæ or paraphyses: but in some forms the antheridia and cystocarps are also produced in similar protuberances.
Chambers's Twentieth Century Dictionary
nNematheciumnem-a-thē′si-um a wart-like elevation on the surface of the thallus of certain florideous algæ.