Agaricales » ‎Agaricaceae » Leucoagaricus

Leucoagaricus houaynhangensis

Basidiomata light green to yellowish-green and turning blue when dried, umbonate to plano-convex pileus covered with dark gray to black granulose to squamules and with light green appendiculate margin, free and light green to yellowish-green lamellae, subcylindrical and yellowish-green support with light green fibrillose remnants, oblong to ovoid basidiospore with a germ pore, 5.8-7.2 × 3.8-5 μm, clavate to utriform cheilocystidia with short to long appendages, 18-32 × 8-15 μm, a hymenodermal pileus covering made up of some cylindrical elements, a cutis support covering made up of hyaline hyphae and cylindrical elements, absence of clamp-connections in all tissues. Pileus 15-35 mm diam, umbonate, explanding via campanulate to applanate to plano-convex, with low umbo, with straight margin; when young granulose, dark gray (1-30F1) to black, soon breaking up into concolourous squamules to squamules fibrillose around granulose umbo toward margin, on light green to yellowish-green (30A5-8) background, attached with light green (30A5) appendiculate margin, fringed and lamellae exceeding when mature. Lamellae free, broadly ventricose, light green to yellowish-green (30A5-6), slightly crowded, with 5 lamellulae series. Support 23-40 × 3-8.5 mm, subcylindrical or wider at base zone and slightly tapering to apex, with green to yellowish-green (30A5-6) fibrillose background. Annulus membranous, rarely present or often fragile, with green to yellowish-green (30A5-6) fibrillose remnants at middle to upper part of support. Context in pileus 2.0-3.0 mm wide, concolourous with surface; in support hollow, concolourous with surface. Odor and taste not observed. Spore print white. Basidiospores [75, 3, 3] l × w = 5.8-7.2 × 3.8-5 μm, avl × w = 6.5 × 4.3 μm, Q = 1.4-1.7, Qav = 1.5, in side-view oblong or ovoid, in frontal view ovoid, oblong, thick -walled, hyaline, with a germ pore, dextrinoid, cogophilous, cyanophilous, metachromatic. Basidia 12-15 × 6-8 μm, clavate, 4-spored, hyaline. Lamella edge sterile. Cheilocystidia 18-32 × 8-15 μm, clavate to utriform, with short to long appendages (l × w = 5-20 × 2.5-3.5 μm), Pleurocystidia absent. Pileus covering a hymenoderm made up of some layers of cylindrical elements, rarely with narrowly clavate elements, 23-47 × 4-7 μm, hyaline to pale brown-walled, under layer with hyaline hyphae, cylindrical, 2.5-6.5 μm wide. Stipe covering a cutis made up of cylindrical elements, 1-2.5 μm wide, hyaline, with cylindrical hyphae in lower layer, 1-4 μm wide, hyaline. Clamp connections absent in all tissues. (Figs. 1-2)

MycoBank: MB817806

 

Holotype: HNL502947

Etymology: The name is referred to the first collecting site of this species at Houay Nhang Preserved Forest.

 

Habitat: solitary, saprotrophic, on humus soil; widespread in deciduous forests of Houat Yang Preserved Forest, Xaythany District, Vientiane Capital, Lao PDR.

 

Specimens examined: Laos, Vientiane Capital, Xaythany District, Houay Nhang Preserved Forest, collected date 12 July 20014, P. Sysouphanthong (PS2014-1448, HNL502947, holotype); ibidem collected date 20 August 20014, P. Sysouphanthong (PS2014-1463, HNL502962, paratypes); ibidem collected date 2 September 20014, P. Sysouphanthong (PS2014-1483, HNL 502982, paratypes).

FIG. 1 Fresh basidiomata of La. houaynhangensis . ac (HNL502947), d (HNL502962), ef (HNL502982).

 

 

FIG. 2 Micromorphology of La.houaynhangensis with scale bars (HNL502947). a hymeniderm structure of pileus covering, b a cutis structure of support covering, c oblong ovoid basidiospoes, d clavate to utriform cheilocystidia with appendages.

 

 

 

Reference

Sysouphanthong P, Bouamanivong S, Salichanh T, Xaybouangeun N, Sucharitakul P, Osathanunkul M and Suwannapoom C, 2018 –Leucoagaricus houaynhangensis (Agaricaceae), A New Yellowish-green Species from Lao People’s Democratic Republic. Chiang Mai Journal of Science, 45, pp.1287-1295.

 

Recent News

Nutritional analysis of cultivated Pleurotus giganteus in agricultural waste as possible alternative substrates
utilization notes of the edibility, economic and medicinal value and if the mushroom is cultivated
The genus Lentinus in Thailand: taxonomy, cultivation tests, nutritional analysis and screening for the biological activity of wild strains

Recent Genus

Tricholomopsis
Erythrophylloporus
Boletinellus

Recent Species

Lactarius lavandulus
Russula zonaria
Russula sribuabanensis