partial veil

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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
• Hypernyms:
veil, velum
• Hyponyms:
cortina
• Part Meronyms:
annulus, skirt