PERIDIUM

peridium

(noun) outer layer of the spore-bearing organ in many fungi

Source: WordNet® 3.1

Etymology

Noun

peridium (plural peridia or peridiums)

(mycology) The outer layer that covers the spore-bearing organ in many fungi.

Source: Wiktionary

Pe*rid"i*um, n.; pl. Peridia. Etym: [NL., fr. Gr. (Bot.)

Definition: The envelope or coat of certain fungi, such as the puffballs and earthstars.

Source: Webster’s Unabridged Dictionary 1913 Edition