Camarophyllopsis olivaceogrisea 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 : 87-89

Camarophyllopsis olivaceogrisea Ming Zhang, C.Q. Wang & T.H. Li sp. nov. Figs 2 a–b , 3

Etymology.

The epithet " olivaceogrisea " refers to the olive-gray pileus color.

Diagnosis.

This new species is morphologically distinguished from other taxa in the genus by its smaller basidiomata, greenish gray to dull green pileus, white and short decurrent lamellae, and broadly elliptic basidiospores.

Type.

CHINA. Guizhou Province: Leishan County, Leigongshan National Nature Reserve, alt. 1260 m, 22 July 2014, M. Zhang (holotype: GDGM44519!).

Description.

Basidiomata small-sized. Pileus 7-12 mm broad, hemispherical, convex to plano-convex at first, then gradually applanate, becoming depressed at disc when mature, non-striate to weakly striate; margin slightly inflexed at first, soon straight, slightly crenate or lacerate when mature; surface matt, velvety, hygrophanous, greenish gray (or olive gray) to dull green (27D 2-30D2, 27D3-30D3, 27E2-30E2, 27E3-30E3), often paler at margin. Flesh 1-3 mm thick in the stipe, white to grayish white, unchanging when exposed. Lamellae 1-2 mm deep, L = 20-34, l = 1-3, short to moderately decurrent, white to weakly grayish white (1A1-1B1) at first, white to weakly greenish white (27A2-30A2) when mature, unchanging when bruised; edge entire, concolorous with the sides. Stipe 13-25 × 1.5-2.5 mm, central, cylindrical and becoming narrower downwards; glabrous and shiny, hardly tomentulose or pruinose, hygrophanous, white to greenish white at first (28A1-28A2, 29A1-29A2), becoming greenish white to light greenish gray (28A2-28B2, 29A2-29B2) when mature and in dry condition. Odor none. Taste mild.

Basidiospores [60/2/2] 4 –5.5(– 6) × 3.5 –4.5(– 5) μm, av. 4.6 × 3.8 μm, Q = (1.12)1.14-1.28(1.43), av. Q = 1.21 ± 0.08, broadly ellipsoid, hyaline, smooth, inamyloid, thin-walled. Basidia 4-spored, occasionally 2-spored, (10 –)15–26(– 30) × 5-7 μm, av. 24.5 × 5.8 μm, hyaline, narrowly clavate, attenuated and flexuous toward base, sterigmata up to 4 μm long. Basidioles cylindrical to narrowly clavate, often flexuous, obtuse, (18 –)20–37.5(– 40) × 6-8 μm, av. 23 × 6.8 μm. Pleurocystidia absent. Marginal cells on the lamellar edges not well differentiated, similar to basidioles on lamellar sides. Lamellar trama composed of sub-parallel or occasionally interwoven and irregularly inflated hyphae (23 –)35–50(– 104) × 4 –8(– 10) μm, av. 46.5 × 7 μm. Pileipellis a cutis of numerous repent branched hyphal 4-8 μm wide, with terminal chains of ellipsoid or cylindrical cells. Pileus trama composed of cylindrical and occasionally branched hyphae (23 –)35–50(– 70) × (4 –)6– 10 μm, av. 45.5 × 7.6 μm. Stipitipellis formed of parallel, thin-walled and narrow hyphae 3-8 μm diam. Caulocystidia not observed. Clamp connections absent in all tissues.

Habit, ecology and distribution.

Solitary, scattered on soil in mixed forests; currently only known from the Guizhou Province of China.

Additional specimens examined.

CHINA. Guizhou Province: Leishan County, Leigongshan National Nature Reserve, alt. 1120 m, 22 July 2014, J. Xu (GDGM44497).

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 3. Camarophyllopsis olivaceogrisea. a Basidiospores b basidioles c Basidia d hyphal terminations in pileipellis e stipitipellis. Scale bars: 10 μm (a-c); 20 μm (d, e).