calyptra corolla PO:0025330 operculum corolla (exact) corolla calyptrae (exact, plural) 蘚帽花冠 (Japanese, exact) 2011-09-15T02:56:38Z plant_anatomy Often found in Eucalyptus and other Myrtaceae. The petals are generally completely fused. If an outer operculum (calyptra calyx) is present, it covers the inner operculum (calyptra corolla). Species of the subgenus Monocalyptrus have only a calyptra corolla (inner operculum) while in most other species, a calyptra calyx is also present, at least early in flower development. Not the same structure as a spore capsule calyptra or fruit operculum. Sometimes erroneously referred to as part of a fruit. inner operculum (exact) caliptra corola (Spanish, exact) rwalls corolline operculum (exact) A fused corolla (PO:0025581) that is composed of fused petals (PO:0025583). fused corolla