Sorus

[sәurәs]

(noun.) cluster of sporangia usually on underside of a fern frond.

(noun.) a spore-producing structure in certain lichens and fungi.

Typist: Millie--From WordNet

(n.) One of the fruit dots, or small clusters of sporangia, on the back of the fronds of ferns.

Checker: Thelma

n. a heap:—pl. Sō′ri.—adj. Sō′rose bearing sori.

Checker: Ramona