Novel and new records published by T.E.S.R.I.

Amanita avellaneosquamosa (Imai) Imai in Ito, Mycol. Fl. Jap.2(5): 250, 1959.

   Amanitopsis avellaneosquamosa Imai in Bot. Mag. (Tokyo) 47: 430 (1933).            

 Pileus 4-11 cm in diam., convex to plano-convex, ground color very pale gray with an occasional pale brownish disc, covered with small, felty-fibrillose, appressed voval remnants, remnants whitish at first, very pale yellow brown in age, detersile; margin finely striate, appendiculate. Gills distant, free, white, turn red when bruised; lamellulae truncate. Stem 50- 140 × 6- 20 mm, tapering toward apex, ground color as pileus, hollow, surface floccose- scaly; basal bulb globose to ovoid. Volva adherent, forming a membranous sac, lobed, white. Pileipellis filamentous hyphae interwoven, 3-8 mm diam., moderately branched, slightly gelatinized. Basidia clavate, 35-52 × 10-13 mm, 4- sterigmata, sterigmata 3-5 mm, basal septa without clamp. Basidiospores (9.0-) 9.5-10.5 (-11.0) × (5.0-) 5.5-6.0 (-6.5) mm, Q = 1.46- 2.10, elliptical (Fig. 1a), amyloid, hyaline, smooth, thin- walled. Gill trama bilateral, subhymenium inflated ramose (Fig. 2a), composed of 2-4 ovate, subglobose to elliptical cells. Volva filamentous hyphae on pileus abundant, 2- 8 mm diam., gelatinized, septa without clamp; inflated cells moderately abundant in the upper layer, subglobose, obpyriform to broadly elliptic, up to 16-18 ×11-16 mm , terminal; with clavate to fusiform-elliptical cells, up to 30-64 × 9-16 mm , intercalary or terminal; inner layer intensely gelatinized, usually with inflated hyphae, 6-17 mm diam.; volval remnants at stem base similar to those on pileus, but outside layer with sparsely interwoven hyphae. Stem trama longitudinally oriented inflated cell, cylindro-clavate, clavate to slenderly clavate, up to 98-257 × 14-58 mm, usually at the terminal of filamentous branching hyphae (2-6 mm diam.); interlaced with enormous sphaerocysts.
Specimens examined：Nantou, Hui-Sun Forest Experimental Station, alt.1750m, C.M.  Chen 2292 (30.X. 1998.); C.M. Chen 2426 (1.VIII. 2000.); C.M. Chen 2475 (10.VIII. 2000.).

Habitat：Solitary under broad-leaved trees.

Distribution：Taiwan, China, Japan.
Remarks: A. avellaneosquamosa is closely related to A. peckiana Kauff. and A. volvata (Peck) Martin of section Amidella group, but the three species are distinguishable in the field by the differences in their morphological characters. A. peckiana has an unstriated pileal margin, crowd gills, and pinkish to pinkish-cream color on pileal remnants, while A. volvata has an unstriated to faintly striated pileal margin, crowd gills and floccose patches on pileus. A. avellaneosquamosa is fairly similar in characters to those of Amanitopsis clarisquamosa Imai as described by Imai (1933), but these two species have been confirmed to be the distinct taxa by the molecular phylogenetic method (Weiβ et al. 1998). Also, A. avellaneosquamosa has smaller spores , sub-distant lamellae and longer striations along the pileal margin, as compared to those of A. clarisquamosa.

, 1961.

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 x 23-40 mm, terminal clavate, interwoven filamentous hyphae, 4-8 mm diam. Ring mostly composed of globose, subglobose, ovate to elliptical inflated cells, inflated cells grayish brown, sometimes subfusiform with projectile-shaped.

Specimens examined：Nantou, Hui-Sun Forest Experimental Station, alt.1750m, C.M. Chen 2469 (9. VIII.2000.); C.M. Chen 2773 (10.V. 2001.).

Habitat：Solitary to scattered under broad-leaved trees.

Distribution：Taiwan, China, Japan.
Remark: 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 mm for the former and 30-40 × 8-10 mm for the latter. Also, the spores of A. griseofarinosa are more broader (8-10 mm) than those of A. vestita (5.5-6 mm).

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