Lepiota metulispora

Pileus 20-60 mm, first subglobose to conical, expanding to parabolic, convex, umbonate, plano-convex, with inflexed margin, when young glabrous, light brown to brown (6D7-8) at center, paler toward margin, orange-white (5A2) to white at margin, when mature glabrous at umbo, light brown to brown (6D7-8), orange-white (5A2) around umbo, with orange-white (5A2) concentrical squamules around umbo and toward margin, on white fibrillose background; at margin peeling from surface, with orange-white (5A2) squamules, sulcate, white woolly or cobwebby, with partial veil remnants. Lamellae free, broadly ventricose, 4 mm wide, white, slightly crowded, with serrulate edge. Stipe 30-50 × 2.8-5 mm, cylindrical, wider at base, 5.5-6 mm wide; completely fibrillose, crowded at annular zone down toward base, white, white to orange-white (5A2), on pale yellow to orange-white (4A3, 5A2) background. Annulus an annular zone, cortinate, or fibrillose, white, sometimes with remnants, orange-white (5A2), granulose at base. Context in pileus white, 2.5-3 mm wide; hollow, concolorous with surface. Smell fruity. Taste unknown. Spore print white. Basidiospores [50,2,2] 13.5-17.0 × 4.0-5.2 μm, avl × avw = 15.0 × 4.7 μm, Q = 2.7-3.4, Qav = 3.1, in side-view cylindrical, with more or less straight abaxial side, inflexed hilar appendage, and suprahilar depression, in frontal view fusiform to cylindrical, thick-walled, dextrinoid, congophilous, cyanophilous, not metachromatic. Basidia 18-30 × 8.5-10 μm, clavate, slightly thick-walled, 4-spored. Lamella edge sterile. Cheilocystidia 18-37 × 7.0-17.5 μm, utriform, clavate to narrowly clavate, rarely broadly clavate, slightly thick-walled. Pileus covering a trichoderm made up of cylindrical elements with rounded apex or slightly tapering to apex, 50-180 × 6.0-11.5 μm, hyaline to pale brown, thick-walled, mostly smoothwalled, sometimes rough-walled, with parietal pale brown pigment, with short clavate elements under these cylindrical elements, with parietal pale brown pigment; with hyaline hyphae under the layer of upright elements, 3-12 μm wide, thick-walled, smooth or rough-walled. Stipe covering of annular zone similar to pileus covering. Clamp connections present in all tissues. (Fig. 1)

Habitat: Growing in a small group or solitary, on dead leaves, saprotrophic and terrestrial on humus soil; in deciduous rain forest with dominant Lithocarpus spp. and grassland of national Park. Distributed in Sri Lanka, India, China, and this is a first report to Thailand.

Specimens examined: Thailand, Chiang Mai Province, Mae Taeng District, Forest of Pha Deng Village, N 19° 07’ 13.7”, E 98° 43’ 52.9”, 905 m, 25 July 2008, P. Sysouphanthong, MFLU 090165; Chiang Rai Province, Mueng District, Forest of Doi Ngaem near Mae Fah Luang University, N 18° 05’ 59.1”, E 102° 40’ 02.9”, 488 m, 18 June 2009, P. Sysouphanthong, MFLU 100495.