Physcomitrium
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Physcomitrium is a genus of mosses, commonly called urn moss after its urn-like calyptra, that includes about 80 species and has a cosmopolitan distribution. The scientific name comes from the Ancient
Physcomitrium pyriforme
Operculum (botany)
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In botany, an operculum or calyptra is a cap-like structure in some flowering plants, mosses, and fungi. It is a covering, hood or lid, describing a feature in plant morphology.
Physcomitrium
…Physcomitrium is a genus of mosses, commonly called urn moss after its urn-like calyptra, that includes about 80 species and has a cosmopolitan distribution. The scientific name comes from the Ancient Greek words physkē, meaning large…
Red operculum of Eucalyptus erythrocorys
Operculum and scar of Eucalyptus blakelyi
Calyptra of Tortula muralis
Calyptra on top of the brown spore capsule (sporophyte) of the moss Physcomitrella patens. The brownish archegonial venter is still visible.