Macrolepiota subcitrophylla Z.W. Ge

Cho, Minseo, Kwon, Sun Lul, Jang, Seokyoon, Yoo, Yeonjae, Lee, Sang Hyun, Kwon, Dae Young, Kim, Changmu, Lim, Young Woon & Kim, Jae-Jin, 2024, Notes of 15 unrecorded macrofungi in Korea, Journal of Species Research 13 (1), pp. 67-88 : 78

Macrolepiota subcitrophylla Z.W. Ge ,

Mycologia 53: 286 (2011) [MB#561826] ( Figs. 1J and 2J ) Korean name: ƚflșḡẗẍfflŷ

Pileus ovoid to hemispherical when young, becoming convex to planate when mature, 12 cm in diam. Pileus surface white, covered with brownish yellow to light brown colored scales, scattered. Lamellae free, crowded, yellow, up to 1 cm. Stipe white, 14.0 × 1.5 cm, with white annulus. Hyphal system monomitic, generative hyphae septate with clamp connections, moderately branched, 2.1-5.5 μm in diam. Basidia clavate, 4-spored, smooth, hyaline, thin-walled, with a basal clamp connection, 25.3- 35.2 × 9.3-11.4 μm. Cheilocystidia narrowly clavate, fusiform, smooth, thin-walled, hyaline, 24.0-50.2 × 5.8- 9.5 μm. Pleurocystidia absent. Basidiospores ellipsoid, thick-walled, smooth, hyaline, 8.5-13.0 × 5.9-8.4 μm [Q = 1.44-1.55].

Specimen examined. Korea, Jeollabuk-do, Gochang-gun, Mt. Seonwoon, Seonwoonsa Temple , 35°29 ʹ 51.4 ʺ N, 126°34 ʹ 51.1 ʺ E, 33 m, mixed hardwood forest, occurring solitary on the ground covered with leaf litters, 25 Aug 2022, M. Cho, KUC20220825-04 (NIBRFG0000514 544) .

Notes - Macrolepiota Singer has a big pileus with scales on surface, and 40 species have been reported worldwide ( Ge et al., 2010; Ge et al., 2012; Lebel and Syme, 2012; Otieno, 2018; Perez et al., 2018; Cho et al., 2019a). In Korea, four species were described previously ( Cho et al., 2019a). Macrolepiota subcitrophylla is characterized by yellowish lamellae, narrowly clavate cheilocystidia, and ellipsoid basidiospores. Macrolepiota subcitrophylla has relatively small-sized basidiospores compared to other Macrolepiota species ( Ge et al., 2012). The morphological characteristics of KUC20220825-04 are similar to the original description, but our specimen has longer cheilocystidia than the original description, 18-38 × 7-15 μm ( Ge et al., 2012). Macrolepiota subcitrophylla is similar to Ma. dolichaula by having white pileus with brownish scales. However, Ma. dolichaula was only discovered in Southern regions such as Sri Lanka and Southern China, and it has larger basidiospores, 12.5-16.0 × 8.0-10.5 μm ( Ge et al., 2010).

Figures

Fig. 1. Macro-morphological characteristics of fifteen unrecorded macrofungi in Korea. A. Agaricus thiersii; B. Baorangia alexandri; C. Boletellus putuoensis; D. Entoloma bulakhae; E. Entoloma pygmaeopapillatum; F. Entoloma subtenuicystidiatum; G. Gerronema kuruvense; H. Hyphoderma nudicephalum; I. Hyphoderma tenue; J. Macrolepiota subcitrophylla; K. Mycena jingyinga; L. Mycena yuezhuoi; M. Ophiocordyceps vespulae; N. Scytinostroma acystidiatum; O. Steccherinum straminellum (scale bar=10 mm for A-D, G-J, M-O; 5 mm for E, F, L; and 2.5 mm for K).

Fig. 2. Micro-morphological characteristics of fifteen unrecorded macrofungi in Korea. A. Agaricus thiersii; B. Baorangia alexandri; C. Boletellus putuoensis; D. Entoloma bulakhae; E. Entoloma pygmaeopapillatum; F. Entoloma subtenuicystidiatum; G. Gerronema kuruvense; H. Hyphoderma nudicephalum; I. Hyphoderma tenue; J. Macrolepiota subcitrophylla; K. Mycena jingyinga; L. Mycena yuezhuoi; M. Ophiocordyceps vespulae; N. Scytinostroma acystidiatum; O. Steccherinum straminellum(scale bars=10μm).