Hodophilus glaberripes Ming Zhang, C.Q. Wang & T.H. Li

Zhang, Ming, Wang, Chao-Qun & Li, Tai-Hui, 2019, Two new agaricoid species of the family Clavariaceae (Agaricales, Basidiomycota) from China, representing two newly recorded genera to the country, MycoKeys 57, pp. 85-100 : 89-92

Hodophilus glaberripes Ming Zhang, C.Q. Wang & T.H. Li sp. nov. Figs 2 c–f , 4

Etymology.

The epithet refers to the glabrous stipe.

Diagnosis.

This species is easily distinguished from other species in the genus Hodophilus by its larger basidiomata, white, brownish orange to brown pileus, glabrous stipe, slightly yam bean smell and broadly elliptic basidiospores.

Type.

CHINA. Guangdong Province: Shaoguan City, Danxiashan National Nature Reserve, alt. 240 m, 10 May 2018, M. Zhang (holotype: GDGM72518!).

Description.

Basidiomata small to medium-sized. Pileus 15-50 mm broad, hemispherical, convex to plano-convex at first, then becoming broadly convex or plano-convex but hardly fully expanded to plane, often depressed at disc when old; white to yellowish white at first, then gradually becoming orange white, pale yellow, pale orange, brownish orange, light brown, brown to reddish brown (5A2, 3A3-5A3, 5C4-7C4, 5D5-9D5) when mature and dry, hygrophanous; margin first slightly inflexed, soon straight, slightly crenate when mature, non-striate or indistinctly translucently striate up to one third when wet; surface matt, velvety and later with fine and darker granules or pruina, at first even, but becoming rugose or rough towards the center when mature, often concentrically cracked in dry conditions. Flesh 0.5-2 mm thick in half radius of the pileus, white, pinkish white to pale beige; Lamellae 3-5 mm deep, distant to subdistant, L = 21-32, l = 1-3, short decurrent, notched, orange white to pinkish white (5A2-10A2) when young, brownish orange, light brown, reddish brown to brownish red (5C4-7C4, 5D6-10D6) when mature, unchanging when bruised; edge entire, concolorous or slightly paler than lamella sides. Stipe (50) 80-100 × 3-5 mm, cental, usually flexuous, cylindrical and slightly narrower downwards; glabrous smooth and shiny, hygrophanous, white to yellowish white at first, becoming pale yellow to pale orange when mature and in dry condition. Odor none or slight yam bean smell, taste mild.

Basidiospores [210/9/9] (4.5)5-6.5(7) × 4-5(5.5) μm, av. 5.9 × 4.7 μm, Q = (1.0)1.11-1.37(1.4), av. Q = 1.20 ± 0.11, broadly ellipsoid to subglobose, hyaline, smooth, inamyloid, thin-walled. Basidia 4-spored, occasionally 2-spored, (32-) 36 –46(– 66) × (4 –)4.5–6(– 7) μm, av. 39.5 × 5.9 μm, tenuated and flexuous towards base, with sterigmata up to 7 μm long. Basidioles cylindrical to narrowly clavate, obtuse, often flexuous, (31 –)34–42(– 60) × (4 –)6–8(– 10) μm, av. 40.5 × 6.9 μm. Pleurocystidia absent. Marginal cells on the lamellar edges usually not well differentiated, similar to basidioles on lamellar sides. Lamellar trama composed of sub-parallel or occasionally interwoven and irregularly inflated branched hyphae with elongate cells (38 –)52–98(– 160) × (4 –)6–14(– 20) μm, av. 88 × 9.5 μm. Subhymenium poorly developed. Pileipellis a transition from hymeniderm to epithelium, with hyphal elements 3-10 μm wide, thin-walled, hyaline, terminations usually composed of 1-3 inflated cells; terminal cells obpyriform, subglobous or ellipsoid, rarely sphaero-pedunculate or broadly clavate, (15 –)19–46(–50)× (7 –)12–22(– 30) μm, av. 38.5 × 18 μm. Pileus trama composed of subparallel hyphae (34 –)46–89(– 130) × (4 –)5.5– 10 μm, av. 74 × 7.6 μm. Stipitipellis formed of parallel, thin-walled and narrow hyphae 3-6 μm diam. Caulocystidia usually in dense fascicles or patches, thin-walled, repent or ascending; with terminal cells mainly clavate, occasionally subcapitate or obpyriform, obtuse, often pedicellate and flexuous, measuring (18 –)22–53(–60)× (4 –)5.5– 13 μm, av. 43 × 7.5 μm. Clamp connections absent in all tissues.

Habit, ecology and distribution.

Solitary, scattered on soil in broadleaf forests and mixed forests; currently only known from China.

Additional specimens examined.

CHINA. Guangdong Province: Huizhou City, Xiangtoushan National Nature Reserve, alt. 640 m, 18 May 2016, H. Huang (GDGM45940); Shaoguan City, Nanling National Nature Reserve, 800 m, 29 July 2017, M. Zhang (GDGM70329 and GDGM70331); Shaoguan City, Danxiashan National Nature Reserve, 200 m, 27 April 2019, X.R. Zhong (GDGM76367 and GDGM76337), J.P. Li (GDGM76300); Jiangxi Province: Jinggangshan Botanical Garden, 884 m, 20 June 2016, H. Huang (GDGM52374), Z.P. Song (GDGM52545); same location, 21 June 2016, Z.P. Song (GDGM52530 and GDGM52583); Hunan Province: Chenzhou City, Jiulongjiang National Forest Park, alt. 230 m, 14 May 2018 X. R. Zhong (GDGM55689).

Figures

Figure 2. a, b Basidiomata of Camarophyllopsis olivaceogrisea (GDGM 44519, holotype) c-f basidiomata of Hodophilus glaberripes (e. GDGM 72518, holotype). Scale bars: 20 mm (a, b); 50 mm (c-f).

Figure 4. Hodophilus glaberripes. a Basidiospores b basidia c basidioles d hyphal terminations in pileipellis e hyphal terminations in stipitipellis. Scale bars: 10 μm (a-c); 20 μm (d, e).