Clavariadelphus khinganensis 2020

Clavariadelphus khinganensis J. Zhao, L.P. Tang & P. Zhang, sp. nov2020

MycoBank No: 830273

Holotype . CHINA. Jilin Province: Antu Prefecture, Er-dao-bai-he Town, Changbai Mountains, mainly broad-leaved forests (Betula platyphylla, Corylus mandshurica, and Quercus monimotricha), mixed with the coniferous tree (Pinus koraiensis), 42°24.05'N, 128°6.00'E, alt. 753 m, 18 August 2019, H.Y. Huang 368 (MHKMU H.Y. Huang 368). Inner Mongolia: De-er-bu-er Town, Greater Khingan Mountains, alt. 800 m, 6 August 2013, P. Zhang 1289 (MHHNU 7789 Holotype); Ku-ti-he Town, Zha-lan-tun City, 24 July 1985, W. Huang s. n. (HMAS 49920).

Morphological description

 Basidiomes up to 12.5 cm high, around 0.8 cm diam. basally, 2.5 cm diam. apically, simple, initially subcylindrical to subfusiform, enlarged upwards in age, then clavate to broadly clavate, finally irregularly laterally compressed; hymenium initially smooth, longitudinally rugose to rugulose in age, pale yellow-brown (4A3) or pale orange (5A 4–6) to greyish-orange (5B4–5, 6B4–5); apex obtuse or broadly rounded, rugose, concolorous with the hymenium at maturity; base terete, smooth, white to pallid when covered, otherwise pale yellow (4A4–5) to light orange (5A4–6); mycelial hyphae interwoven, white; flesh initially solid, becoming soft and spongy upwards as the apex enlarges in age, dirty white. Odour and taste not recorded. Spore deposit not recorded. Hymenium extending over the apex of basidiomata, composed of basidia and leptocystidia. Basidia 85–105 × 8–11 μm, clavate, hyaline, thin-walled, 4-spored, sterigmata 9–10 μm in length. Basidiospores [20/1/1] 9.2–12.0 × 4.6–6 μm, Q = 1.6–2.2, Qm = 1.97 ± 0.17, narrowly ellipsoid or amygdaliform, with a small apiculus, inamyloid, thin-walled, hyaline in KOH, smooth. Leptocystidia 60–70 × 3–4 μm, scattered amongst and scarcely projecting beyond the basidia, cylindrical to narrowly clavate, thin-walled, smooth, hyaline, non-pigmented, clamped, inflated apically at maturity, at times with apical or subapical branches. Mycelial hyphae lacking material.

Habitat: on the ground in broadleaved forests 

Distribution: China. Solitary on the ground in broadleaved forests at around 800 m altitude.

GenBank Accession:

Notes: . Clavariadelphus khinganensis, known from broad-leaved forests in N China, is distinct by its solitary habit at low elevations (around 800 m), small size, pale brown-orange basidiomes, ellipsoid basidiospores and very pale yellow reaction in KOH

Reference: Hong-Yan Huang1,*, Jie Zhao1,*, Ping Zhang2 , et al.

Figure 2. Clavariadelphus species in China.) h, i C. khinganensis (h from MHHNU 7789, holotype i from MHKMU H.Y. Huang 368)