sorus

noun
so·​rus | \ˈsȯr-əs \
plural sori\ ˈsȯr-​ˌī , -​ˌē \

Definition of sorus 

: a cluster of plant reproductive bodies: such as

a : a cluster of sporangia on the underside of a fertile fern frond

b : a mass of spores bursting through the epidermis of the host plant of a parasitic fungus

c : a cluster of gemmae on the thallus of a lichen

First Known Use of sorus

1832, in the meaning defined above

History and Etymology for sorus

New Latin, from Greek sōros heap

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The first known use of sorus was in 1832

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