Phylum:Basidiomycota >> Class: Basidiomycetes >>  Order: Agaricales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Amanita griseofarinosa

Amanita griseofarinosa Hongo in Mem. Fac. Liberal Arts Shiga Univ., Pt. 2, Nat. Sci. 11: 39. 1961.

 Description: Pileus 5-8.5(-10) cm broad, broadly convex becoming plane, rarely uplifted, " surface dry, pale drab, densely covered with grayish to fuscus, powdery-floccose patches of universal veil tissue which often become aggregated into fugacious warts," slightly gelatinous to viscid when wet, with non-sulcate, appendiculate margin; flesh white, moderately brittle, abruptly thin near the margin but moderately thick near the stem, unchanging when cut, smell faint. Gills close to subdistant, free, white, ventricose, 3-7 mm wide, with subflocculose edges; short gills subtruncate to attenuate. Ring grayish to yellowish grey, distinctly pulverulent-floccose, fugacious. Stem 8-14 × 0.5-0.9 cm, attenuated upward, subclavate to obovoid, solid, surface covered with yellowish gray, pulverulent-flocculose remnants of friable partial veil and volva. Pileipellis filamentous hyphae (2.5-)5-9 µm diam., radially extended with brown inflated cells, slightly gelatinized. Basidia (40-)55-63(-68) × (9-)12-16(-18) µm, clavate, 4-spored, sterigmata 4-5 µm long, basal septa without clamps. Basidiospores (8.0-)9.5-11.5(-12) × (7.0-)8.0-10.0(-10.5) µm, Q = 1.13-1.44, subglobose to broad elliptical (Fig.1b), amyloid, hyaline, smooth, thin-walled. Gill trama 50-120 µm broad, composed of parallel, hyaline, cylindrical hyphae, 2-8 µm, with abundant intercalary inflated cells, subhymenium inflated ramose (Fig. 2b), composed of 2-3 elliptical cells. Volva filamentous hyphae on pileus rare, 2-6 µm; inflated cells abundant, globose, subglobose, ovate (31-40 × 55-58 µm) to elliptical (44-47 × 64-72 µm), occasionally subfusiform, grayish brown, terminal or in short, terminal chains; volval remnants at stem base very similar, but with more hyphae and generally smaller cells. Stem trama largely composed of longitudinally cylindrical hyphae, up to 250-350 × 23-40 μm, terminal clavate, interwoven filamentous hyphae, 4-8 μm diam. Ring mostly composed of globose, subglobose, ovate to elliptical inflated cells, inflated cells grayish brown, sometimes subfusiform with projectile-shaped.

Nantou, Hui-Sun Forest Experimental Station, alt.1750m, 9 Aug. 2000, Chen CM. 2469; same location, 10 May 2001, Chen CM. 2773.

 Habitat: Solitary to scattered under broad-leaved trees.

Taiwan, China, Japan.


Chen, CM et al. 2002.


C. M. Chen

 Note: A. griseofarinosa has remnants of volva on pileus, which has irregularly disposed and inflated cells intermixed with many hyphae. Its dark-color and slender carpophore with distinctly floccose ring, extending over stem in the young, is an uncommon character in section Lepidella group. In many respects with the volva characters in particular, A. griseofarinosa is fairly similar to Amanita vestita Corner & Bas, but they are distinguishable by their basidium sizes: 55-63 × 12-16 μm for the former and 30-40 × 8-10 μm for the latter. Also, the spores of A. griseofarinosa are more broader (8-10 μm) than those of A. vestita (5.5-6 μm).