Stropharia subrugosoannulata J. Z. Xu, 2024

Zhang, Di, Peng, Jun-Jie, Wang, Jia-Jun, Priyashnatha, A. K. Hasith, Liao, Jin-Peng, Luo, Hua-Xing, Huang, Shi-Chen & Xu, Ji-Ze, 2024, Morphological characteristics and phylogenetic analyses revealed two new species from China and a new record from Jilin Province of Agaricales, MycoKeys 109, pp. 73-90 : 73-90

Stropharia subrugosoannulata J. Z. Xu sp. nov.

Fig. 3

Diagnosis.

Stropharia subrugosoannulata is distinguished from other species of the genus Stropharia by the pileus covered with greyish-orange squamules in the centre, stipe light brown and surface covered with white triangular squamules. Acanthocytes present in the basal mycelium of stipe. Chrysocystidia rare.

Holotype.

China, Fujian Province, Sanming City, Tianbaoyan Nature Reserve, Longwu Village , on soil, Phyllostachys pubescens, alt. 700 m, 21 October 2023, J. P. Liao ( HMJU 12441 , holotype).

Etymology.

“ sub ” means “ near ”, named as it is similar to S. rugosoannulata .

Description.

Pileus 25–60 mm diam., planoconcave or almost plane with or without being depressed in the centre, red copper to dull red (7 C 3–8 B 3), covered with greyish-orange (7 B 5) squamules in the centre, the margins with partial veil remnants. Lamellae adnate to adnexed, crowded, titian red to terra-cotta (7 D 6–7 E 7), with lamellulae in 1–3 tiers. Stipe 25–48 mm long and 6–10 mm wide, sometimes evanescent annulus in the upper part of the stipe, slightly broad with whitish rhizoids at the base. Surface longitudinally striate, light brown (6 D 6) and covered with white triangular squamules.

Basidiospores [30 / 4 / 3] (5.3) 5.8–6.3 – 6.8 (7.0) × (3.2) 3.4–3.7 – 4.0 (4.1) µm, Q = (1.50) 1.56–1.86 (1.91), Qm = 1.72, ellipsoid to subovate, obvious germ-pore, fawn to light fawn in KOH and Melzer’s reagent. Contains 1–2 guttulates. Basidia (10.6) 13.8–16.8 – 19.4 (19.9) × (4.1) 5.6–6.8 – 7.7 (8.7) µm. 2–4 spored, clavate, sterigmata up to 2.6 µm long, hyaline in KOH. Pleurocystidia (24.0) 26.3–30.5 – 36.9 (39.0) × (7.9) 8.3–10.1 – 12.8 (13.9) µm, clavate with or without umbo, hyaline in KOH, containing amorphous contents. Cheilocystidia (27.9) 29.1–33.2 – 37.1 (41.4) × (8.8) 9.0–10.7 – 13.0 (15.5) μm. Clavate, expanding at the tip, tapering downwards, sometimes curved. Chrysocystidia is rare. Lamellae trama regular, parallel to subparallel, 5.1–12.7 μm wide, hyaline in KOH. Pileipellis a cutis of parallel, hyphae 5.1–11.6 µm wide. Acanthocytes present in the basal mycelium of stipe. Clamp connections are present.

Habitat.

Gregarious on the soil in the phyllostachys pubescens.

Known distribution.

Known only from south-eastern China.

Additional material examined.

Fujian Province, Sanming City, Tianbaoyan Nature Reserve, Longwu Village, on soil, Phyllostachys pubescens alt. 700 m, 21 October 2023, J. P. Liao ( HMJU 12439).

Comments.

The species is characterised mainly by the pileus covered with greyish-orange squamules in the centre, the margins with partial veil remnants, stipe light brown and surface covered with white triangular squamules, Sometimes evanescent annulus in the upper part of the stipe, chrysocystidia rare.

Figures

Figure 3. Stropharia subrugosoannulata (HMJU 12441, holotype) A habitat and basidiocarps B SEM images of basidiospores C basidia D cheilocystidia E pleurocystidia F basidiospores G acanthocytes H pileipellis. Scale bars: 5 cm (A); 5 µm (C, F); 10 µm (D, E, G, H).