Photo: © Steve Trudell
Amanita porphyria
(Alb.& Schw. ex Fr.) Secr.

Pileus: 3.5 - 4.0 cm broad; convex to parabolic at first then umbonate, occasionally depressed; margins incurved to inrolled at first then straight and even at maturity, at times with veil remnants; surface dry to moist with appressed fibrils and with irregularly sized warts; when young, disc dark brown becoming paler towards margin, when mature, light to greyish brown; warts buff to dark grey to greyish orange; context 3 - 4 mm at junction with stipe, moist, fragile, white to grey, darker directly underneath cuticle; taste mild; odour indistinct to earthy.

Lamellae: Ascending to notched when young, then becoming free at maturity; spaced average to crowded; edges even to fimbriate; white to ivory when young becoming pallid to grey when mature, becoming grey when bruised; 1 - 3 lamellulae present.

Stipe: 6.0 - 10 cm long X 0.4 - 0.8 cm wide at apex, 1.0 - 2.0 cm wide at base; equal to tapering upwards, with an abrupt flattened bulb; surface dry, pruinose to scabrous at apex above annulus, below annulus striate to fibrillose with appressed fibrils banding towards base; colour pallid to buff, light grey especially towards base.

Annulus: Membranous, superior (located at top 1/3 of stipe); at first attached then becoming movable and often disappearing; grey, upper surface longitudinal striate, under surface pruinose.

Volva: Grey membranous, attached, tightly adhering to stipe base, with a narrow free rim at the apex, sometimes with patches above the volva.

Microcharacteristics: Spore print print; spores 7 - 11 X 7 - 9 µm, globose to subglobose, smooth, amyloid; globose hymenial sterile cells abundant.

Comments: This species has a solitary to scattered habit and is recognized by its greyish brown membranous annulus and the bulb at the base of the stipe with its tightly adhering grey volva.

Further Reading:

Jenkins, D. 1986. Amanita of North America. Madd River Press. pp 200.

Thiers, H.D. 1982. The Agaricales (gilled fungi) of California. 1. Amanitaceae. Mad River Press. Eureka Ca. pp 53.

Thiers, H.D. and J.F. Ammirati. 1982. New species of Amanita from Western North America. 1982. Mycotaxon. 15: 155-166.