Candolleomyces subcacao T. Bau & J.Q. Yan, 2021

Bau, Tolgor & Yan, Jun-Qing, 2021, Two new rare species of Candolleomyces with pale spores from China, MycoKeys 80, pp. 149-161 : 149

Candolleomyces subcacao T. Bau & J.Q. Yan sp. nov. Fig. 2

Holotype.

China. Henan Province: Bird Island, Nanwan Lake, Xinyang City, 32°06'43.32"N, 113°06'03.06"E, 124 m elevation, 17 July 2016, Tolgor Bau, Jun-Qing Yan, HMJAU37807 (holotype!)

Etymology.

Referring to its morphological similarity to C. cacao .

Diagnosis.

Differs from C. cacao in having a distinct spore germ pore.

Description.

Pileus 11-35 mm, spreading hemispherically to planar, hygrophanous, brown (7E7-7E8), striate up to halfway from the margin or indistinct, becoming slightly dirty white (7B1-7B2) upon drying. Veil pale brown (7A5-7B6), thin, fibrillose, falling off easily. Context thin and very fragile, dirty white (7B1-7B2), approximately 1.0 mm thick at the centre. Lamellae 3.0-4.0 mm wide, moderately close, adnate to slightly adnexed, pale brown (C3-C4) to dark brown (7D6-7E6), saw-toothed under 20 × magnification. Stipe 40-50 mm long, approximately 2.0 mm thick, white (7A1-7B1), hollow, equal, smooth, with white fibrils (7A1-7B1) at the base. Odour and taste indistinct.

Spores 6.8-8.0(8.8) × 3.9-4.9 μm, Q = 1.4-1.8, ellipsoid to oblong-ellipsoid, profile slightly flattened on one side, rarely phaseoliform, inamyloid, smooth, pale yellow-brown, darkening in 5% KOH, pale brown, germ pores distinct, but small, approximately 1.0 μm wide. Basidia 17-22 × 6.1-7.3 μm, clavate, hyaline, 4-spored. Pleurocystidia absent. Cheilocystidia 22-36 × 9.8-14 μm, scattered to moderately numerous, various, utriform to fusiform, with an obtuse to broadly obtuse apex, rarely subcapitate or clavate, ovoid, thin-walled. Trama of gills irregular. Pileipellis consisting of 2-3 cells in the deep layer of the subglobose cell, 20-37 μm wide.

Habit and habitat.

Solitary to scattered on rotten wood in oak forest.

Other specimens examined.

China. Henan Province: Bird Island, Nanwan Lake, Xinyang City , 17 July 2016, Tolgor Bau and Jun-Qing Yan, HMJAU37808, HMJAU37809; Borden Forest Park, Xinyang City, 17 July 2017, Jun-Qing Yan, HMJAU37898, HMJAU37899, HMJAU37900, HMJAU37948, HMJAU44554 ; Jiangxi Province: Jiangxi Agricultural University, Nanchang City, 3 June 2019, Jun-Qing Yan, HFJAU0716, 9 June 2019, Jun-Qing Yan, HFJAU1274; Yun Bi Feng National Forest Park, Shangrao City, 5 July 2019, HFJAU1014 .

Figures

Figure 2. Basidiomata and microscopic features of Candolleomyces subcacao a-c Basidiomata d spores e basidia f pileipellis g cheilocystidia. Scale bars: 10 mm (a-c); 10 μm (d-g).