
1) Cover 2) Covering 3) Natural covering
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https://www.crosswordclues.com/clue/peridium

The peridium is the protective layer that encloses a mass of spores in fungi. This outer covering is a distinctive feature of the Gasteromycetes. Depending on the species, the peridium may vary from being paper-thin to thick and rubbery or even hard. Typically, peridia consist of one to three layers. If there is only a single layer, it is called a...
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http://en.wikipedia.org/wiki/Peridium

A wall or membrane of sterile cells around a fruiting body (e.g., around a sporangium or delimiting an aecium). (Pl. peridia.)
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http://ppathw3.cals.cornell.edu/glossary/Defs_P.htm

• (n.) The envelope or coat of certain fungi, such as the puffballs and earthstars.
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http://thinkexist.com/dictionary/meaning/peridium/
Pe·rid'i·um noun ;
plural Peridia . [ New Latin , from Greek ... about + ..., a dim. ending.]
(Botany) The envelope or coat of certain fungi, such as the puffballs and earthstars.
Found on
http://www.encyclo.co.uk/webster/P/55

Type: Term Pronunciation: pe-rid′ē-ŭm Definitions: 1. In fungi, the hyphal structure that surrounds the asci.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=67008

[
n] - outer layer of the spore-bearing organ in many fungi
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http://www.webdictionary.co.uk/definition.php?query=peridium

peridium The envelope or coat of certain fungi, such as the puffballs and earthstars.
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http://www.wordinfo.info/words/index/info/view_unit/1046/2
noun outer layer of the spore-bearing organ in many fungi
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.