Hohenbuehelia longzhousis L. L. Qi, N. Lang & Y. Li, 2023

Qi, Liangliang, Ge, Yupeng, Li, Liying, Qin, Yanchun, Zeng, Hui, Lang, Ning & Li, Yu, 2023, Two new species of Hohenbuehelia (Pleurotaceae) from China, Phytotaxa 578 (2), pp. 158-168 : 162-164

Hohenbuehelia longzhousis L. L. Qi, N. Lang & Y. Li sp. nov. Figs. 2–3

Mycobank: MB843462

Etymology— longzhouesis refers to Longzhou county, the collection location of the holotype.

Diagnosis:—Differs from other Hohenbuehelia species by its big size and surface flesh color to pale flesh color of basidiomata, globose to subglobose basidiospores, characteristic metuloid pleurocystidia and distinctive nrITS & LSU sequence.

Holotype:— CHINA. Guangxi Zhuang Autonomous Region, Chongzuo City , Longzhou County, elevation 230m, on saw dust angiosperm, 20 March 2020, GAASwsw10126 ( FFAAS 0348 !).

Description:—Basidiomata fleshy, pileus 50–80 mm diam., applanate, reniform to dimidiate, dimidiate in age, imbricate, surface flesh color to pale flesh color (7B3/7C3/7D4), paler towards margin; tomentose, mated fibrillose, ivory to grayish white woolly, dense near base and margin, sparse elsewhere, hygrophanous when moist, nonstriate when dry; margin involute and undulating when young, become incurved and entire or slight wavy. Context slight thick, 0.3–0.6cm, white to yellowish white (4A2/4A3), soft. Lamellae close to crowded, with lamellulae of different lengths, arising from a lateral point or very rarely from a rudimentary stipe or base, white, edge concolorous to the sides, ventricose, moderately broad, 2–4mm broad, entire. Stipe absent. White mycelial mat at base. Spore print white. Odor mild to unpleasant, taste mild.

Basidiospores 5.0–7.5 × 5.0–7.0 μm, (L m = 6.87 ± 0.51, W m = 6.13 ± 0.34); Q = 1.04–1.29, Q m = 1.12, globose to subglobose, smooth, inamyloid, thin-walled, with granular contents. Basidia 20–39 × 6–10 μm, 2 or 4 sterigmate, clavate to subclavate, thin-walled, hyaline. Lamella edge sterile. Pleurocystidia usually distinctly thick-walled, with mostly several wall layer, present both on sides of lamellae, numerous, scattered, 62.0–96.0 (110) × 12.0–17.0 μm, narrowly fusiform to fusiform, setiform, with a covering of coarse to finely granular crystals; crystals slowly dissolve in 3% aqueous KOH, light fuscidulous. Cheilocystidia 18–22 ×5.5–7.5 μm, subclavate, lageniform with an inflated base with a thin, irregular, bifurcate, multifurcate apex, thin-walled, hyaline. Pileoleptocystidia 61.5–85.5 × 3.5–6.0 μm, setiform to slightly flexuous, thick-walled, hyaline to slight yellow. Hymenophoral trama subregular, horizontal, gelatinous, 2.5–4.0 μm, hyaline. Pileal trama composed of interwoven, branched hyphae of 1.85–3.0μm wide, thinwalled, hyaline. Pileipellis 2.2–2.6 μm wide, nearly trichodermium towards the base, not distinct from the pileus trama, hyaline, with gelatinous subpellis (250–320 μm thick). Clamp connection present.

Habitat & phenology:—Scattered, gregarious or imbricate on saw dust or decaying dead fallen angiosperm in subtropics. March-April.

Additional specimens examined:— CHINA. Guangxi Zhuang Autonomous Region, Chongzuo City , Longzhou County, elevation 230m, on saw dust angiosperm, 20 March 2020, GAASwsw10127 ( FFAAS 0349 ) .

Figures

FIGURE 2. Basidiomata of Hohenbuehelia longzhousis. a&b: FFAAS 0348 (Holotype). Scale Bar: = 1cm. Photos by Liangliang Qi.

FIGURE 3. Hohenbuehelia longzhousis (FFAAS 0348, Holotype). A&B: Basidiomata. C: Basidiospores. D: Basidium. E: Metuloid pleurocystidia. F: Cheilocystidia. G: Pileoleptocystidia. H: Pileipellis. Scale Bar: A & B = 1cm. C–H = 5 μm.