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

Amanita ovalispora Boedijn, Sydowia 5: 320. 1951.
   
 
 
 
 
　Description： Pileus convex to plano-convex, margin sulcato-striate, nearly halfway the cap, 5-7 cm in diam., smooth greyish brown. Flesh very thin, white, 1-2 mm thick near the stalk, rapidly thinning out near the margin. Gills free, pure white to cream colour, whitish with occasional pale yellow tint, moderately crowded, 4-5 mm high in the middle. Stem hollow, pure white to grayish white, 7-10 × 0.6-1.0 cm, at first covered by slightly flocculose or small adpressed scales, especially near the base, soon becoming glabrous, attenuated near the apex and not bulbous at the base. Wall of stem about 2 mm broad. Volva free, sheathing the base of the stem, dirty white, with lobed margin, 2.5-3 cm high, 1.5-2 cm broad. Pileipellis a trichodermium of septate hyphae. Basidia 43-57 × 12-18 μm, clavate, 4- spored, sterigmata 8 μm in NH4OH seen to have numerous amorphous refractive yellowish particles scattered, basal septa without clamp. Basidiospores (8.0-)9.0-11.0(-12.0) × (7.0-)7.5-9.0(-10.0) μm, Q = 1.12-1.38, broad elliptical to elliptical, inamyloid, hyaline, smooth, thin-walled. Gill trama bilateral; mediostram 20-35 μm broad, composed of many longitudinal, elliptical to spindle-form inflated cells, 35-80 × 12-20 μm, interwoven with plenty of cylindrical branched hyphae, 2-5 μm broad, clamp connection absent; subhymenium 30-40 μm thick, inflated-ramose type, composed of 2-3 layers cells, inflated cells short elliptical to barrel-shaped. Volva surface layer composed of longitudinally filamentous hyphae, 2-10 μm broad; inner layer composed of dense, hyaline, cylindrical hyphae, 4-10 μm broad, sometimes intercalary inflated, up to 18 μm diam., while the closest layer to stem composed of loose, hyaline, cylindrical hyphae, 3-8 μm broad, inflated cells usually oval to subglose, up to 55-85 × 43-62 μm, with elliptical inflated cells, up to 60-120 × 30-57 μm, single and terminal. Stem trama largely composed longitudinally cylindrical hyphae, up to 250-350 × 23-40 μm, terminal clavate, interwoven filamentous hyphae, 4-8 μm diam. Cheilocystidia sterile, often composed of pyriform to broad clavate, with ovate to short elliptical (25-35 × 20-24 μm), thin-walled, hyaline inflated cells.
 
 
 
 
 
　Specimens：

Taiwan, Nantou: Sun Moon Lake, alt. 800m, 8 Sept. 1994, Huang, H. W. 789; same location, 12 Jul 2000, Chen, CM. 2413.
 
 
 
　Habitat： Solitary under broad-leaved trees.
 
 
 
　Distribution：

Taiwan, China, Indonesia.
 
 
 
　References：

Chen, CM et al. 2002.
   
   
   
　Provided：

C. M. Chen
 
 
　Note： The distinguishing characters of A. ovalispora are its free volva, hollow stem and the convex to plano-convex pileus with sulcato-striate margin, which extends to nearly halfway of the cap. Lamellae are gray-brownish in color when dried, a distinct characters for the species.