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 Agaricus bitorquis
SynonymsPsalliota bitorquis
BiostatusPresent in region - Exotic
Images (click to enlarge)
Caption: Watercolour
Owner: G.M. Taylor | 
Caption: Watercolour
Owner: G.M. Taylor | 
Caption: A. bitorquis, 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 (30-)50(-70) mm diam., thick, fleshy,
convex when young, finally broadly convex-applanate, surface silky to fibrillose,
white (N9.5) when young, bruising orchraceous brown (7.5YR 6/4-4/4), with soil
particles often adhering to surface; margin thin, inrolled edge with remnants
of veil when young; lamellae insertion free, thin, crowded, pink (5R 8/4) when
young, finally moderate brown to dark brown (5YR 4/4-3/2), edge pale and sterile;
trama parallel to irregular. Stipe 25-45 x 10-30 mm, central, solid, cylindrical,
to widening at centre, base narrowing, surface smooth to fibrillose, white (N9.5)
above annulus, browning below annulus (5YR 4/4-3/2). Annulus double: lower brownish
(5YR 4/4-3/2), peronate, prominent; upper white (N9.5), pendant, surface fibrillose,
indistinct. Flesh slowly becoming reddish brown (5R5/8-2.5YR5/8) on cutting
or on bruising; odour and taste pleasant. Schaffer's cross-reaction negative.
Basidia (2-)4-spored, 22-38 x 5-11 µm, clavate
with sterigmata 4-8(-10) µm. Cheilocystidia 12-37 x 6-11 µm, broadly clavate,
hyaline to fawn, abundant. Basidiospores dark brown in mass, size (6.9-)7.4(-7.9)
x (5.5-)6.0(-6.4) µm, elongation (1.1-)1.3(-1.4) µm, ellipsoid, pale brown to
brown in water, refractive centre (1-2 droplets), apiculus lateral, germ-pore
not visible.
Habitat: Gregarious, may be hypogean in lawn or pasture.
Good edible quality.
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