Definitions for: Sorus

[n] cluster of sporangia usually on underside of a fern frond
[n] a spore-producing structure in certain lichens and fungi

Webster (1913) Definition: So"rus, n.
(a) In parasitic fungi, any mass of spores bursting
through the epidermis of a host plant.
(b) In lichens, a heap of soredia on the thallus.

So"rus, n.; pl. Sori. [NL., fr. Gr. ? a heap.] (Bot.)
One of the fruit dots, or small clusters of sporangia, on the
back of the fronds of ferns.

See Also: indusium, reproductive structure

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