Asproinocybe hongyaniae S.M. Tang & S.H. Li

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, Phytotaxa 640 (1), pp. 16-26 : 19-23

publication ID	https://doi.org/ 10.11646/phytotaxa.640.1.2
DOI	https://doi.org/10.5281/zenodo.13213034
persistent identifier	https://treatment.plazi.org/id/895087C7-4038-FFB0-F7D8-F8F43A835709
treatment provided by	Felipe
scientific name	Asproinocybe hongyaniae S.M. Tang & S.H. Li
status	sp. nov.

Treatment

Asproinocybe hongyaniae S.M. Tang & S.H. Li , sp. nov. ( Figs. 2–5 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 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 View Materials 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 View Materials ) ; ibid, elev. 579 m, S. M. Tang, 2020062903 ( MFLU23-0326 View Materials ) .

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).