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 Agaricus porphyrocephalus
SynonymsPsalliota porphyrea
BiostatusPresent in region - Exotic
Images (click to enlarge)
Caption: B, A. porphyrocephalus, Bars = 5 µm. | 
Caption: fruitbody
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 45-65 mm diam., thick, fleshy, convex
when young, finally broadly convex, often with central depression, dark red-purple
(5R 4/4-3/2) scales on lilac surface, scales decreasing towards the margin,
bruising dark red (5R 4/8); margin inrolled when young, finally inrolled to
straight, uneven edge, with remnants of veil; lamellae insertion free, thin,
crowded, pink (5R 4/4-6/4) when young, finally reddish brown 5R 3/2); edge concolorous,
fertile; trama parallel to irregular. Stipe 35-45 x 12-18 mm, central, solid
to fistulose, cylindrical, sometimes wider at the middle, narrowing towards
the base, dark pinkish above annulus (5R 6/4-7/4), purplish below annulus (5R
5/4-6/4), surface sometimes streaked below annulus, bruising dark red-purple
(5R 4/4-3/2). Annulus pendant, thin, purple-brown, ephemeral. Flesh white (N9.5),
slowly becoming
reddish (5R 6/6-6/8) upon cutting or bruising;
odour and taste pleasant. Schaffer's cross-reaction negative.
Basidia 4-spored, 15-35 x 8-10 µm, broadly
clavate to clavate, with sterigmata 2-5 µm. Basidiospores dark brown in mass,
size (7.7-)8.5(-9.3) x (4.9-)5.7(-6.4) µm, elongation (1.1-)1.3(-1.4) µm, ellipsoid
to ovoid, pale brown to dark brown (2.5YR 4/4-5YR 4/4) in water, refractive
centre (2 droplets), apiculus lateral, germ-pore not visible.
Habitat: In rings in lawn or pasture, reported amongst
Paspalum grass.
Distribution: NEW ZEALAND Northland, Auckland (Taylor 1983).
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