Asproinocybe hongyaniae S. M. Tang & S. H. Li, sp. nov.
Creators: name: Lv, Tong
name: Wang, Shuai
name: Wu, Xiaoqu
name: Chen, Dechao
name: Ao, Chengce
name: Luo, Hongmei
name: Li, Erxian
name: Tang, Songming
name: Li, Shuhong
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Tricholomataceae
Asproinocybe
Asproinocybe hongyaniae

description: Asproinocybe hongyaniae S.M. Tang & S.H. Li, sp. nov. (Figs. 2–5)
MycoBank: 850196
Etymology:—This new species is named in honor of the late Prof. Hongyan Su at Dali University, for her great contribution to mycology.
Holotype:— THAILAND, Chiang Rai Province, Mae Fah Luang University Park, elev. 467 m, 2020, S. M. Tang, (2020062901, MFLU23-0327 holotype!).
Diagnosis:— Asproinocybe hongyaniae is similar to A. sinensis, but can be distinguished by its medium grey to olive grey pileus and narrowly clavate pleurocystidia and cheilocystidia.
Description: Pileus 30–60 mm in diam., hemispherical when young, becoming convex to plano-convex with age, smooth, slightly depressed to depressed at center, medium grey (1E2), dark grey (1F1), olive grey (1E1–2) at center, becoming olive (1E4–8) towards the margin, margin smooth; context 4–6 mm thick, firm, pale grey (1B2). Lamellae ventricose, adnexed, crowded, light violet (19A5) when immature and becoming violet blue (19A8) when mature; lamellulae in 1–2 tiers, 3–4 mm wide. Stipe 30–50 × 5–10 mm, cylindrical, central, equal, pale grey (1B2), flocculose on the surface; context solid, pale grey. Base with white rhizomorphs. Odor unpleasant.
Basidia 32–37 × 8–11 μm, av. 35.5 ± 1.8 × 9.3 ± 0.8 μm, cylindric to narrowly clavate, 4–spored; sterigmata 2–4 × 0.7–1.9 μm. Basidiospores (excluding ornamentation) [68/2/2] 5.8–8.5 × 4.5–6.3 μm, av. 6.5 ± 0.75 × 5.2 ± 5.2 μm, Q = 1.19–1.65, Q m = 1.44 ± 0.14, oblong, hyaline, colourless, irregularly tuberculate, ornamentation below to 1.0 μm high. Cheilocystidia 27–42 × 6–10 μm, av. 32.4 ± 5.3 × 7.8 ±1.3 μm, narrowly clavate, thin-walled, colorless and hyaline, abundant; apex mucronate or rostrate. Pleurocystidia 29–44 × 7–9 μm, av. 37 ± 7.5 × 8.3 ± 0.6 μm, narrowly clavate, thin-walled, colorless and hyaline, abundant; apex mucronate to rostrate, rarely mucronate branched. Lamellar trama 63–80 μm thick, regular, composed of slightly thick-walled, hyphae 2–4 μm wide. Lamellar edge more in a number of sterile basidia. Subhymenium 9–15 μm thick, tightly interwoven, fusiform or irregular cells, 4–9 × 3–4 μm. Pileipellis 80–120 μm thick, colourless hyaline in KOH, composed of appressed, tightly interwoven, simply septate, thin-walled, cylindrical, hyphae 3–7 μm wide, colorless, and hyaline. Stipitipellis composed of appressed, parallel, simply septate, thick-walled, hyphae 3–7 μm wide; stipe trama composed of longitudinally arranged, colourless in KOH, clavate terminal cells, infrequently branching, septate, thick-walled. Clamp present at some septa in pileipellis, for lamellae and stipitipellis not seen.
Ecology and distribution: — On soil, mostly solitary to gregarious in Dipterocarpoideae forests dominated by Dipterocarpus, Quercus, and Shorea. Known from the type locality in Mae Fah Luang University Park, Thailand.
Additional material examined: Thailand, Chiang Mai Province, Mae Fah Luang University, 29 June 2020, elev. 635 m, S. M. Tang, 2020062902 (MFLU23-0325); ibid, elev. 579 m, S. M. Tang, 2020062903 (MFLU23-0326).
Notes: — Asproinocybe hongyaniae is similar to A. sinensis in their pileus and lamellae colour. However, A. sinensis was originally described in China (Mou & Bau 2021), and it has a lilac grey, greyish violet lamellae, violet white to light violet stipe, and shorter basidiospores (7–10 × 4.8–7.0 μm), cheilocystidia and pleurocystidia are different between A. hongyaniae and A. sinensis, the cystidia of the former are narrower, and the cystidia of the latter have many shapes (oblong to ellipsoid, utriform, ampullaceous, fusiform or clavate, with a swollen base and a neck, acute or mucronate at apex).
description: Published as part of Lv, Tong, Wang, Shuai, Wu, Xiaoqu, Chen, Dechao, Ao, Chengce, Luo, Hongmei, Li, Erxian, Tang, Songming & Li, Shuhong, 2024, Asproinocybe hongyaniae sp. nov. (Agaricales, Basidiomycota) in Thailand, pp. 16-26 in Phytotaxa 640 (1) on pages 19-23, DOI: 10.11646/phytotaxa.640.1.2, http://zenodo.org/record/13213324