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 Agaricus semotus
BiostatusPresent in region - Exotic
Images (click to enlarge)
Caption: D, A. semotus, Bars = 5 µm. | 
Owner: G. Stevenson | 
Owner: J.A. Cooper | 
Owner: J.A. Cooper | 
Owner: J.A. Cooper | 
Caption: cap showing schaeffer reaction
Owner: J.A. Cooper | 
Caption: cheilocystidia
Owner: J.A. Cooper | 
Caption: spores
Owner: J.A. Cooper | |
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 15-40 mm diam., thin, convex when young, finally applanate, centre slightly umbonate, with fawn (3.5YR 5.2/4.0) scales on white (N9.5) background at centre, decreasing towards margin, bruising brownish orange (2.5YR 5/7-6/8); margin inrolled when young, finally straight, edge smooth, with remnants of veil; lamellae insertion free, thin, crowded, of several lengths to alternate, orchraceous salmon (4YR 7.0/7.5) when young, finally umber (7YR 3.7/5.8), edge pale, sterile; trama parallel to irregular. Stipe 20-40 x 4-10 mm, central, fistulose, cylindrical, club-shaped with swollen sometimes twisted base, smooth to silky, white (N9.5) to umber (7YR 3.7/5.8) above annulus, yellow (2.5Y 9/8) below annulus, especially towards base, bruising yellow (2.5Y 9/8-8/8), base with mycelial cords. Annulus pendant, thin, ± ephemeral, white above, yellow below, surface silky. Flesh white, becoming yellow (2.5Y 9/8-8/8) at stipe base upon cutting or bruising; odour of anise; taste sweet. Schaffer's cross-reaction positive.
Basidia 4-spored, 12-20 x 5-7 µm, clavate with sterigmata 3-4 µm. Cheilocystidia 15-29 x 6-8 µm, clavate, abundant, hyaline. Basidiospores dark brown (5YR 3/2) in mass, size (5.7-)6.4(-6.9) x (4.0-)4.5(-4.9) µm, elongation (1.3-)1.5(-1.7) µm, ellipsoid, pale brown in water (2.5YR 4/4), refractive centre (2-3 droplets), apiculus lateral, germ pore not visible.
Habitat: Gregarious.
Distribution: NEW ZEALAND Northland.
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