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Sc Sh Sk Sm So Sp St Su Sy
Sol Sor

Sorus

/ˈsôrəs/

Noun, pl. sori

(Botany)

1. A cluster of sporangia (structures producing and containing spores) on the edge or underside of a fern frond. (wikipedia.org and wiktionary.org)

2. Any reproductive structure, in some lichens and fungi that produces spores. (wiktionary.org)

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