The Collaborative International Dictionary
Sporidium
Sporidium \Spo*rid"i*um\ (sp[-o]*r[i^]d"[i^]*[u^]m), n.; pl. Sporidia (-[.a]). [NL. See Spore.] (Bot.)
A secondary spore, or a filament produced from a spore, in certain kinds of minute fungi.
A spore.
Wiktionary
sporidium
n. 1 (context botany English) A secondary spore, or a filament produced from a spore, in certain kinds of minute fungi. 2 A spore.