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 Agaricus bisporus var. bisporus
BiostatusPresent in region - Exotic
Images (click to enlarge)
Caption: A. bisporus var. bisporus, Bars = 5 µm |
Article: Mitchell, A.D.; Walter, M. (1999). Species of Agaricus occurring in New Zealand. New Zealand Journal of Botany 37(4): 715-725 (http://www.rsnz.org/publish/abstracts.php).
Description: Pileus 50-80(-120) mm diam., thick, convex,
fleshy, strong brown to brownish orange (5YR 5/4-4/5) scales on white surface
(N9.5), bruising reddish (5R 7/6-6/8); margin thick, inrolled when young, finally
straight, with remnants of veil; lamellae insertion free, thin, crowded of several
lengths, pink (5R 8/4) when young, finally moderate brown (7.5YR 4/4); edge
pale and sterile; trama parallel to irregular. Stipe 30-50 x 10-30 mm, central,
solid to fistulose, cylindrical, base rounded to narrowing, surface smooth,
white (N9.5) above annulus, white to brownish below annulus (7.5YR 4/4-5YR 4/4),
slight reddening (5R 6/8) on bruising. Annulus peronate, thick and broad, bifurcated
edges, white above (N9.5), brown below (7.5YR 4/4-5YR 4/4) white (N9.5) towards
the edges, surface smooth. Flesh gradually reddening (5R 7/6-6/8) on cutting
or bruising; odour and taste pleasant. Schaffer's cross-reaction negative.
Basidia (l-)2(-4)-spored, 15-25 x 9-11 µm,
broadly clavate, with sterigmata 3-5 µm. Cheilocystidia 30-80 x 7-9 (12) µm,
clavate, hyaline, abundant. Basidiospores dark brown in mass, size (6.8-)7.7(-8.5)
x (5.6-)6.1(-6.6) µm, elongation (1.0-)1.3(-1.5) µm, broadly ellipsoid, fawn
to pale brown in water, refractive centre (2 droplets), apiculus lateral, germ-pore
not visible.
Habitat: Gregarious or in rings in pasture, often
in areas with high manure content. Good edible quality.
Distribution: NEW ZEALAND Canterbury, Otago. Commonly cultivated
mushroom.
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