taxonID	type	description	language	source
03E487B21C1B104040B7942DFBE3B867.taxon	diagnosis	Diagnosis: — Basidiomata small. Pileus 20 – 60 mm in diam, surface white (1 A 1) to greyish white (1 B 1); white (1 A 1) volval remnants on pileal surface conical to subconical to pyramidal. Stipe 40 – 70 mm long, 7 – 12 mm diam., subcylindrical, densely covered with concentrically arranged appressed to recurved greyish white (1 B 1) somewhat milk white (1 A 2) squamules. Annulus superior, membranous, white (1 A 1) to greyish white (1 B 1). Basidiospores broadly ellipsoid to ellipsoid, amyloid, 9 – 13 (15) × (6) 7 – 9.5 (10) μm. Clamps common. Etymology: — orientisororius, referring to its smaller basidiomata occurring in East Asia in comparison with those of A. vittadinii, a putatively related species found in Europe and North Africa. Types: — CHINA. Inner Mongolia Autonomous Region: Xarmoron Park, Tongliao City, 43 ° 38 ′ 15 ″ N, 122 ° 16 ′ 2 ″ E, elev. 183 m, 10 Aug. 2018, Tolgor Bau, HMJAU 59015 (holotype!), same location, 43 ° 37 ′ 52 ″ N, 122 ° 15 ′ 33 ″ E, elev. 180 m, 18 Aug. 2018, Tolgor Bau, HMJAU 59016 (paratype!). Description: — Basidiomata (Fig. 2, 3) small, rarely medium-sized. Pileus 20 – 60 mm in diam., convex to applanate, surface white (1 A 1) to greyish white (1 B 1); volval remnants on pileal surface conical to subconical to pyramidal, up to 2 – 3 mm in height and 3 – 4 mm in diam., white (1 A 1) to milk white (1 A 2), upper half often pale to yellowish white (2 A 2); margin non-striate, appendiculate; trama white (1 A 1), unchanging when injured. Lamellae free or nearly free, white, milk white (1 A 2) to yellowish white (2 A 2), lamellulae attenuate. Stipe 40 – 70 mm long, 7 – 12 mm diam., subcylindrical, white (1 A 1) to pale yellowish white (2 A 2), densely covered with concentrically arranged appressed to recurved pale yellowish white (2 A 2) squamules; context white (1 A 1), unchanging when injured; stipe base nearly cylindrical or attenuate downwards, 7 – 14 mm diam., upper half covered with floccose, white (1 A 1) to greyish white (1 B 1) to yellowish white (2 A 2) squamules. Annulus superior, membranous, white (1 A 1) to greyish white (1 B 1), upper surface striate, lower surface often with floccose, greyish white (1 B 1) to milk white (1 A 2) warts. Odor unknown. Lamellar trama bilateral. Mediostratum composed of abundant fusiform to clavate inflated cells (16 – 23 μm wide), mixed with abundant filamentous hyphae (5 – 10 μm wide), lateral stratum made up of abundant clavate to subclavate inflated cells (14 – 25 μm wide), mixed with 4 – 11 μm wide filamentous hyphae. Basidia (Fig. 4) 35 – 47 × 9 – 12.5 μm, clavate, 4 – or 2 – spored; sterigmata 4 – 6 μm long. Basidiospores (Fig. 4) [80 / 4 / 3] (8.5) 9 – 13 (15) × (6) 7 – 9.5 (10) μm, Q = (1.20) 1.22 – 1.54 (1.60), Qm = 1.38 ± 0.10, broadly ellipsoid to ellipsoid, amyloid, slightly thickwalled, colorless and hyaline, smooth. Lamellar edge appearing as a sterile strip, composed of numerous subglobose to clavate or broadly clavate inflated cells, usually single and terminal or in chains of 2 – 3, thin – walled, colorless, hyaline; filamentous hyphae rare, thin – walled, hyaline or with yellowish contents. Volval remnants on pileus (Fig. 4) composed of vertically arranged elements: inflated cells very abundant to dominant, subfusiform to elongate-ellipsoid, occasionally subglobose, 35 – 110 × 15 – 30 μm, colorless and hyaline; filamentous hyphae scattered to locally abundant, 3 – 6 μm wide; vascular hyphae rare 3 – 7 μm wide. Pileipellis composed of subradially arranged cylindrical hyphae 4 – 13 μm wide, barely gelatinized. Stipe trama composed of longitudinally arranged elements: inflated cells dominant, often in short chains, sometimes terminal, 150 – 250 × 10 – 30 μm; filamentous hyphae 3 – 7 μm wide, scattered, branching and anastomosing, occasionally clamped; vascular hyphae rare, 3 – 10 μm wide. Clamps present in all parts of basidiomata, but more common in lamellae. Habitat and distribution: — Solitary or scattered on grass lawn or sand dunes; occurring in summer and fall; known from Northeastern China. Additional specimen examined: — CHINA. Inner Mongolia Autonomous Region: Xarmoron Park, Tongliao City, 43 ° 38 ′ 21 ″ N, 122 ° 16 ′ 7 ″ E, elev. 188 m, 5 Sep. 2021, Tolgor Bau, HMJAU 59017.	en	Liu, Xiaoliang, Bau, Tolgor, Yang, Zhu L. (2021): A new saprotrophic species of Amanita (Amanitaceae, Agaricales) from Inner Mongolia, China. Phytotaxa 527 (4): 284-292, DOI: 10.11646/phytotaxa.527.4.6
