Velum : (noun) 1: 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 [syn: partial veil]
2: 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 [syn:
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