Lepiota aureofulvella
Pileus 18–45 mm, convex to umbonate, expanding to planoconcave, with straight margin; brown to dark brown (6E7–8, 6F7–8) fibrillose around center or umbo, with golden brown to yellowish-brown (5D5–8) fibrills to fibrillose squamules towards the margin, background white; margin with yellowish-brown (5D5) fibrillose partial veil, exceeding lamellae when mature. Lamellae free, white, ventricose, 4–6 mm wide, somewhat crowded, fragile. Stipe 23–65 × 3–7 mm, cylindrical; covered with white fibrills, with brown to dark brown (6E7–8, 6F7–8) fibrillose at base zone, on white background and slowly turned light brown (6D4) when touched. Annulus in form of an annular zone, made up of white fibrils. Context in pileus white, 3–6 mm wide; in stipe hollow, white. Spore print white. Basidiospores 5–8.5 × 3.5–5.2 μm, Q = 1.4–2.3, cylindrical to oblong in side view, with truncate to spurred base, triangular or with curved abaxial side, slightly thick-walled, hyaline, dextrinoid, congophilous, cyanophilous, not metachromatic. Basidia 14–20 × 4.5–7.5 μm, clavate, hyaline, 4-spored. Cheilocystidia 15–29 × 4–12 μm, clavate to narrowly clavate, utriform, rarely cylindrical, hyaline, thick-walled. Pleurocystidia absent. Pileus covering a cutis made up of long cylindrical elements to narrowly clavate terminal elements, elements with rounded to slightly tapered tips, 60–145 × 4–15 μm, thick-walled, with brown parietal pigment. Stipe covered with fibrillose squamules similar to pileus covering. Clamp-connections present in all tissues. (Fig. 1-2)
Habitat: in Laos Growing in a small group, saprotrophic, on soil mixed with decayed leaves and wood, found in deciduous forests of Oudomxay Province, northern Laos.
Specimens examined: Laos, Oudomxay Province, Xay District, Houay Houm Village, 7 August 2014, P. Sysouphanthong, HNL502948.
Fig. 1 Basidiomata of Lepiota aureofulvella in the field (HNL502948).
Fig. 2 Micromorphological characteristics of Lepiota aureofulvella (HNL502948), a. basidospores,
b. cheilocystidia, c. a cutis structure of pileus covering.
Reference
Sysouphanthong P, Thongklang N, Suwannapoom C, Nuangmek W and Hyde KD, 2020 – Lepiota Section-Stenosporae (Agaricaceae): Two New Records to Lao People's Democratic Republic. Chiang Mai journal of science, 47(1), pp.49-56.
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