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sorus

(sō′rəs, sôr′əs)

noun pl. sori

a cluster of spore cases, esp. the ones on the undersurface of a fern frond

Origin: ModL < Gr sōros, a heap: see soma

See sorus in American Heritage Dictionary 4

noun pl. so·ri (sôrˈī, sōrˈī)

A cluster of sporangia borne on the underside of a fern frond.
A reproductive structure in certain fungi and lichens.

Origin:

Origin: New Latin sōrus

Origin: , from Greek sōros, heap; see teuə- in Indo-European roots

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