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
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Examples of partial veil
partial veil
The partial veil that protects the developing gills is initially thick, baggy, and rubbery.
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Often there is a second layer of tissue, the partial veil, covering the bladelike gills that bear spores.
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Mushrooms that lack a partial veil do not form an annulus.
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Young specimens are covered with a grayish, slimy partial veil that later ruptures and leaves a sheathlike ring on the stem.
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Both of these species have a less well-developed partial veil, and their flesh is a duller tone lacking yellow-orange tints.
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As the cap expands, the veil breaks, and remnants of the partial veil may remain as a ring, or annulus, around the middle of the stalk or as fragments hanging from the margin of the cap.
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Young mushrooms have a white cobweb-like partial veil that does not last long before it disappears, although it sometimes remains as a non-permanent ring on the upper part of the stem.
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When the partial veil breaks or pulls away from the stem or the cap splits radially, the blackish-brown gleba is exposed, which allows the spores to be dispersed.
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The delicate ring on the upper part of the stem is a remnant of the partial veil that extends from the cap margin to the stalk and covers the gills during development.
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