Cryptomarasmius aucubae (Neda) T.S. Jenkinson & Desjardin (2014: 92)

Li, Siying & Bau, Tolgor, 2024, New findings of Cryptomarasmius (Physalacriaceae, Agaricales) from Jilin Province, China, Phytotaxa 641 (1), pp. 57-65 : 62-63

Cryptomarasmius aucubae (Neda) T.S. Jenkinson & Desjardin (2014: 92) ( Figure. 3 )

≡ Marasmius aucubae Neda (1998: 92)

Description: —Pileus less than 3 mm in diam., hemispherical or obtusely conical when young, becoming plano-convex or applanate and slightly depressed at maturity, light brown (6D5), reddish brown (8E8) or brownish orange (6C8) at centre, light orange (5A4), orange white (6A2) or whitish (6A1) at margin, with dense granular small bulges, sulcate. Context thin, whitish (6A1). Lamellae adnexed to adnate, relatively sparse, whitish (6A1), mostly L=9−12, I=0−1. Stipe central, 1.0−3.0 cm long, less than 0.1 cm in diam., filiform, brownish orange (6C6) to reddish brown (8E7) or dark brown (8F8), fibrous, hollow. Odour and taste indistinct.

Basidiospores [40/3/3](5.6)5.8−7.2(7.4)×(2.7)2.8−4.2(4.3)µm,Q=1.71−2.33, Qm=1.90±0.19, ellipsoid, ellipsoid-fusoid, oblong, smooth, thin-walled, hyaline, non-amyloid. Basidia 12−25×6−8 µm, clavate, 4-spored, smooth, thin-walled. Basidioles 15−24×6−8 µm, subfusiform, clavate, sometimes with papilla. Cheilocystidia of two types: a) Rotalis-type broom cells, 10−25×7−11 µm, clavate to broadly clavate, slightly thick-walled, pale yellow (4A3) at the top part. b) subfusiform, lageniform, subcylindrical, rostrate, 18−32×4−10 µm. Pleurocystidia 19−34×4−8 µm, similar with cheilocystidia of type b, lageniform, thin-walled. Pileipellis a hymeniderm composed of 7−34×4−27 µm Rotalis-type broom cells, subglobose, clavate, broadly clavate, brown (6E8) to light yellow (4A4) or colorless, thick-walled. Pileocystidia 15−20×4−11 µm, lageniform, mostly subcylindrical. Stipitipellis a cutis with roughened hyphae, covered with warts or cylindrical excrescences, thick-walled. Caulocystidia 7−21×2−5 µm, subcylindrical, lageniform, mostly subcylindrical. Clamps present in all tissues.

Habitat: —Grow on the fallen leaves of broad-leaved trees such as Quercus mongolica Fisch. ex Ledeb. and Ulmus pumila L. in summer.

Known distribution: — RUSSIAN FEDERATION ( Kiyashko et al. 2014), CHINA (this study), Korea ( Kiyashko et al. 2014), JAPAN (Neda et a1. 1998; Kiyashko et al. 2014).

Specimen examined: — CHINA. Jilin Province: Jiaohe City, Qianjin Experimental Forestry Farm , on fallen leaves of Quercus mongolica , 25 August 2023, Siying Li ( HMJAU 68271 ) ; Jilin Province: Huadian City, Hongshi Forestry Farm , on fallen leaves, 28 August 2023, T. Bau & Siying Li ( HMJAU 68272 ) ; Jilin Province: Changchun City, campus of Jilin Agricultural University , on fallen leaves, 1 September 2023, Siying Li ( HMJAU 68273 ) .

Figures

FIGURE 3. Cryptomarasmius aucubae (HMJAU 68273) a. Basidiomata; b. Basidiospores; c. Basidia; d. Basidioles; e. Cheilocystidia of type a; f. Cheilocystidia of type b; g. Pleurocystidia; h. Pileipellis and pileocystidia; i. Caulocystidia. Scale bars: a=0.4 cm; b–d, h =10 μm; e–g, i =20 μm. Drawn by Siying Li.