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so·rus | \ ˈsȯr-əs 
\
\ plural sori\ ˈsȯr-ˌī , -ˌē \
, -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
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The first known use of sorus was in 1832
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