Peridium
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The peridium is the protective layer that encloses a mass of spores in fungi. This outer covering is a distinctive feature of gasteroid fungi.
The outer layer of this bird's nest fungus (Crucibulum laeve) is the peridium.
Internal surface of the peridium of the rare myxomycete Tubifera dudkae is covered with folds
Volva (mycology)
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In mycology, a volva is a cup-like structure at the base of a mushroom that is a remnant of the universal veil, or the remains of the peridium that encloses the immature fruit bodies of gasteroid fung
The volva is the prominent cup-shaped feature at the base of this Amanita caesarea.
Volvariella bombycina
Volvariella surrecta growing parasitically
Volvopluteus gloiocephalus