membrane of the young sporophore of various mushrooms extending from the margin of the cap to the stem and is ruptured by growth; represented in mature mushroom by an annulus around the stem and sometimes a cortina on the margin of the cap
membrane initially completely investing the young sporophore of various mushrooms that is ruptured by growth; represented in the mature mushroom by a volva around lower part of stem and scales on upper surface of the cap
a membrane found on the subumbrella surface of jellyfishes of the Class Hydrozoa. Also a ciliated swimming organ of the veliger larvae. Shelf-like membrane structure on the subumbrella (ventral) surface, which extends from the outer edge to the manubrium. Synapomorphy of Hydrozoa2.