Wiktionary

coenosorus

English

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Blechnum appendiculatum has coenosori (red bits) along the midrib of each pinna.
 
Pteris cretica's coenosori are located around the margins.

Etymology

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coeno- (“common”) +‎ sorus

Noun

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coenosorus (plural coenosori)

  1. (botany) A compound sorus consisting of multiple fused sori.

Further reading

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