Pileus 18–40 mm, first campanulate, expanding to umbonate, plano concave, with straight to inflexed margin; when young glabrous, golden yellow (5B7) to brown (6D7–8), soon breaking, with glabrous umbo, radially squamulose around umbo toward margin; margin covered with white partial veil. Lamellae free, moderately crowded, ventricose, 3–5 mm wide, pale yellow to light yellow (3A3–4, 4A4–5). Stipe 35–70 × 4–6 mm, cylindrical to subcylindrical; squamulose from annular zone towards the base, squamules concolourous with those on pileus, on light yellow (4D4) background, turned grayish orange (5B4–5) when touched. Annulus in form of an annular zone, made up of concolourous squamules on stipe. Context in pileus pale yellow to light yellow (4D4-5); in stipe hollow, concolourous to surface. Spore print white. Basidiospores 5.5–8.5 × 3.5–4.5 μm, Q = 1.4–2.2, ellipsoidal to cylindrical, in side view with straight or slightly outgrown spur at base, apex rounded or more acute, hyaline, dextrinoid, congophilous, cyanophilous, not metachromatic. Basidia 15–45 × 5.5–9 μm, mostly clavate, sometimes narrowly clavate, 4-spored, hyaline,thin-walled. Cheilocystidia 25–65 × 4.5–12 μm, narrowly clavate to clavate, rarely oblong with short pedicel. Pleurocystidia absent. Pileus covering a trichoderm, made up of narrowly clavate elements, often wider at apex and narrowed into pedicel, 60–195 × 6.5–20 μm, wall pale brown, with parietal and intracellular brown pigment, with cylindrically hyaline to pale brown hyphae at under layer, 3–7 μm wide, with intracellular pigment. Stipe covering trichodermal, with squamules similar to those in pileus covering. Clamp-connections present in all tissues. (Fig. 1-2)
Habitat: Occurring in groups, saprotrophic, on soil mixed with decayed leaves and wood; found in deciduous forests of Oudomxay Province, northern Laos.
Specimens examined: Oudomxay Prov., Distr., Houay Houm Village, 20 July 2014, P. Sysouphanthong, HNL502981; Kone Kaen Village, 12 Aug 2014, P. Sysouphanthong, HNL502963.
Fig. 1 Basidiomata of Lepiota citrophylla in the field
Fig. 2 Micromorphological characteristics of Lepiota citrophylla (HNL502981), a. basidospores, b. cheilocystidia, c. a trichodermal structure of pileus covering.
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.