sorus
noun
so·rus ˈsȯr-əs 
plural sori ˈsȯr-ˌī
-ˌē
: 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
Example Sentences
Recent Examples on the Web Last fall, divers couldn’t find any sorus tissue in the usual spots. 
Carol Leonetti Dannhauser, Hartford Courant, 27 May 2022 Just 4 pounds of sorus can seed 30,000 pounds of kelp for harvest. BostonGlobe.com, 26 June 2021 Fishermen place spore-holding sorus tissue along lengths of rope and submerge them, letting Mother Nature do the rest. BostonGlobe.com, 26 June 2021
Carol Leonetti Dannhauser, Hartford Courant, 27 May 2022 Just 4 pounds of sorus can seed 30,000 pounds of kelp for harvest. BostonGlobe.com, 26 June 2021 Fishermen place spore-holding sorus tissue along lengths of rope and submerge them, letting Mother Nature do the rest. BostonGlobe.com, 26 June 2021 Word History
Etymology
New Latin, from Greek sōros heap
First Known Use
1832, in the meaning defined above
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