Agaricales » ‎Agaricaceae » Lepiota

Lepiota eurysperma

Pileus 45-60 mm, when young parabolic, expanding via conical to campanulate to plano-convex, with wide umbo, with inflexed margin, when young felted or glabrous, dark brown (8F4-6), soon breaking up into patches and squamules, brown (7E6-7) at umbo and with light brown (7D6) to brown (6E6) fibrillose squamules, very crowded around centre, with light brown (7D6) irregularly concentrical squamules around umbo towards margin on white to yellowishwhite (4A2) background; margin cortinate and connected with stipe when young, when mature floccose, squamulose, fringed. Lamellae free, crowded, ventricose, up to 4 mm wide, white, with floccose edge. Stipe 30-70 × 4-5 mm, cylindrical, wider at bulb, 6 mm wide, covered completely with white floccose fibrillose covering, densely so at annular zone at middle to upper part of stipe, below annular zone to base pale yellow brown (4A2) fibrillose and darker downwards to base, with brown (7E4) fibrillose squamules, sometimes with drops on stipe, hollow. Annulus an annular zone, fibrillose or cortinate, white. Context in pileus white to yellowish white (4A2), 2-2.3 mm wide, in stipe, white to light brown (6D4), with white fibrils in central cavity. Smell very strong, sweet. Taste mild, a little bit spicy. Spore print white. Basidiospores [75,3,3] 7.8-11.5 × 4.5-6.5 µm, avl × avw = 8.9 × 5.2 µm, Q = 1.3-2.4, avQ = 1.7, in side-view amygdaliform, without or without suprahilar depression, in frontal view more or less fusiform, hyaline, thick-walled, dextrinoid, congophilous, cyanophilous, not metachromatic. Basidia 24-40 × 9.5-11.5 µm, clavate, 4-spored, sometimes 2-spored, rarely 1-spored, hyaline, thick walled, with clamp-connections. Lamella edge sterile. Cheilocystidia 14-35 × 7.0-17 µm, clavate or sphaeropedunculate, (sub)utriform, hyaline, thick-walled, rarely with apical excrescence. Pleurocystidia absent. Pileus covering a trichoderm made up of narrowly cylindrical elements, 60-255 × 5.0-11 µm, sometimes septate, pale brown and thick-walled; pigment pale brown and parietal; with short cylindrical to narrowly clavate elements, 35-45 × 5.0-10.5 µm, with hyaline hyphae up to 2.5-4 µm wide in under layer. Stipe covering in squamules a trichoderm similar to pileus covering. Clamp-connections present in all tissues. (Fig. 1)

MycoBank: MB 519960


Holotype: Thailand: Chiang Mai Province, Mae Taeng District, near Forest of Pong Duad Village, N 16° 06’ 16.1”, E 99° 43’ 07,9”, alt. 780- 805 m, 8 August 2008, P. Sysouphanthong, MFLU 0900035

Etymology: The name of this species comes from its broad basidiospores

Habitat: Growing in a small or large group, on humus rich soil with decaying leaves indeciduous wood, in mixed rain forest with several kinds of tree species and bamboo; only known from Mae Taeng District, Chiang Mai Province, Thailand.


Specimens examined: Thailand, Chiang Mai Prov., Mae Taeng Dist., near Forest of Pong Duad Vill., N 16° 06’ 16.1”, E 99° 43’ 07,9”, alt., 780-805 m, 10 August 2007, P. Sysouphanthong, MFLU 0900035 (holotype); ibidem, 4 August 2007, P. Sysouphanthong, MFLU 090003; ibidem, 17 September 2007, P. Sysouphanthong, MFLU 0900069; ibidem, 8 August 2008, P. Sysouphanthong, MFLU 0900198.