Clavariadelphus griseoclavus L. Fan & L. Xia, 2020

Xia, Lu & Fan, Li, 2020, A new species of Clavariadelphus (Basidiomycota: Clavariadelphaceae) from China based on morphological and molecular data, Phytotaxa 447 (1), pp. 61-67 : 62-63

Clavariadelphus griseoclavus L. Fan & L. Xia sp. nov. ( Fig. 2 )

MycoBank: MB 835249

Etymology:— griseo, grey, clavus, clavate, referring to the color and shape of the basidiomata.

Holotype:— CHINA. Shanxi Province, Pangquangou National Forest Park, 37°49ʹ5ʺN, 111°28ʹ34ʺE, 1800 m, 29 August 2018, on soil among decomposing litter under the mixed forest dominated by Pinus tabuliformis and Quercus wutaishanica, J. Yang LH 286A (BJTC FM964).

Description:— Basidiomata 70–130 × 10–15 mm, subcylindric to clavate, slightly tapering downward, apex obtuse, surface smooth when young, rugose to rugulose at maturity, color of the upper part grey-white when young, grey to greyish at maturity, grey-white to pale white towards base. Basidia 87.5–132.5 μm in length, thin-walled, narrowly clavate to clavate, apically inflated at maturity, becoming broadly clavate, 10–17.5 μm diam, basal clamp connections present, tetrasterigmate, sterigmata (5–)7.5–10(–12.5) μm in length. Basidiospores 10–11 × 5–6.5 μm, Q (L/I) = 1.33–2.10 (Qm = 1.89) (n = 60), ellipsoid to narrowly ellipsoid, smooth, thin-walled, inamyloid, with a prominent apiculus, hyaline in KOH and lightly staining in Congo Red. Leptocystidia 75–112 × 2.5–6 μm, mixed among the basidia, scarcely projecting beyond the basidia, cylindrical, subcylindrical, strangulated, flexuous, sometimes apically branched, or inflated, occasionally with inclusions. Basal clamp connections present. Context hyphae 5–11 μm diam, parallel, septate, rarely inflated, hyaline in KOH.

Habit, habitat and distribution:—Epigeous, on soil among decomposing litter in mixed forest dominated by P. tabuliformis and Q. wutaishanica , Shanxi Province, China.

Additional specimens examined:— CHINA. Shanxi Province, Pangquangou National Forest Park, 37°49ʹ5ʺN, 111°28ʹ34ʺE, 1800m, 29 August 2018, on soil among decomposing litter under the mixed forest dominated by P. tabuliformis and Q. wutaishanica, J. Yang LH 286B (BJTC FM965).

Figures

FIGURE 2. Clavariadelphus griseoclavus (BJTC FM964, holotype). a. Basidiomata. b. Hyphae with clamp connections.c. Basidiospores. d. Basidia. e. Leptocystidia. Scale bars: (a) 10 mm; (b) 10 μm; (c) 5 μm; (d) 10 μm; (e) 10 μm. Photo by: Li Fan. Drawings by: Lu Xia.