Heinemannomyces splendidissimus Watling, Belg. J. Bot. 131(2): 135 (1998)

Hosen, Md. Iqbal, Song, Zong-ping, Gates, Genevieve, Samantha C. Karunarathna,, Chowdhury, M. Salahuddin M. & Li, Tai-Hui, 2017, Two new species of Xanthagaricus and some notes on Heinemannomyces from Asia, MycoKeys 28, pp. 1-18 : 5

Heinemannomyces splendidissimus Watling, Belg. J. Bot. 131(2): 135 (1998) Figs 6, 7

Description.

Basidiomata medium-sized to large. Pileus 35-65 mm broad, at first hemispherical, then convex to applanate with age, sometimes depressed at disc, pileus surface covered by snuff brown, chestnut brown, purple-brown or grayish red (9B4, 9C4, 10CD4), woolly-floccose or woolly arachnoid velar remnants, usually darker at center, outer zone showing dull white to whitish background when the velar remnants vanish; margin incurved with slightly appendiculate velar remnants, often slightly lacerated; context 3-4 mm thick at pileus centre, elsewhere thin, changes from white to slightly reddening when cut or injured. Lamellae free, depressed around the stipe, broadly ventricose, bluish gray to leaden gray (19B3, 18C3) when young, becoming dark blue (19E4-7) to bluish gray (19D3-5) when mature; 3-4 tiers of lamellulae. Stipe 50-60 × 5-6 mm, central, cylindrical, slightly tapering towards the base, floccose-squamulose all over the stipe, often vanish from handling or rain, with lighter shade of the pileus color, fistulose; stipe context slightly reddening when cut or injured. Annulus delicate, fugacious. Odor and taste unknown.

Basidiospores [60/3/3] (5.5 –)6–6.5(– 7) × 3.5 –4.5(– 5) µm, [mean length = 6.25 µm, mean width = 4.15 µm, Q = 1.42 –1.55(– 1.63), Qm = 1.50 ± 0.043], ellipsoid to ovoid-ellipsoid, inamyloid, slightly thick-walled (0.5 µm), smooth, dark brown, grayish brown to slightly leaden gray in H2O and 5% KOH. Basidia 13-19 × 7-9 µm, clavate to broadly clavate, colorless or pale yellow in H2O and KOH, 4-spored, rarely 2-spored, with sterigmata up to 2 µm long. Lamellar trama regular to subregular, composed of thin-walled cylindrical hyphae 4-8 µm wide. Cheilocystidia 15-22 × 6-10 µm, abundant and scattered colorless, clavate to cylindro-clavate, sometimes narrowly fusoid, smooth, hyaline, thin-walled. Pleurocystidia absent. Pileus hyaline or pale yellow, 4-10 wide hyphae; refractive hyphae very common, 5-8 µm wide. Pileipellis (woolly-floccose squamules on pileus) a complex of hyphal types, interwoven, loosely arranged, brick red in mass but hyaline to light red or pale red individually when observed in H2O and KOH, sometimes slightly puffy or swollen in some portion of some hyphae, smooth, thin-walled, cylindrical hyphae 4-10 µm wide; terminal elements measuring 20-50 × 4-10 µm. Stipitipellis similar to pileipellis but with paler color and slightly narrower hyphae measuring 3-8 µm wide. Stipe trama composed of parallel hyphae 4-9 µm wide, hyaline; refractive hyphae sometimes present 3-5 µm wide. Clamp connections not found in any tissue.

Habit, habitat and distribution.

Solitary, scattered on the ground; known from Malaysia, Thailand, and now China.

Specimens examined.

CHINA, Guangdong Province, Shantou City, Nanao Island, 8 May 2015, Iqbal, Tai-Hui Li & Ting Li (GDGM 46633); same location, 9 May 2015, Iqbal, Tai-Hui Li & Ting Li (GDGM 46634, GDGM46635).