peridium

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pe·rid·i·um

(pe-rid'ē-ŭm),
In fungi, the hyphal structure that surrounds the asci.
[G. pēridion, dim. of pēra, leather pouch]

peridium

(pə-rĭd′ē-əm)
n. pl. perid·ia (-ē-ə)
The covering of the spore-bearing organ in many fungi.

pe·rid′i·al (-ē-əl) adj.