Entoloma pygmaeopapillatum Arnolds & Winterh.

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 : 74

Entoloma pygmaeopapillatum Arnolds & Winterh. ,

Zeitschrift für Mykologie 52(2): 255 (1986) [MB#129501] ( Figs. 1E and 2E )

Korean name: 난쟁ḓq1fflŷ

Pileus convex to plane, center depressed when mature margin straight, even, 5-15 mm in diam. Pileus surface smooth, virgate, striate, brown in the center, becoming light brown to the margin. Lamellae adnate, subdistant. Stipe central, equal, slightly fibrillose when old, brown, 40-60 × 0.7-1 mm. Hyphal system monomitic, generative hyphae simple septate, rarely branched, without clamp connections, thin-walled, hyaline, 4.9-7.3 μm. Basidia clavate to subclavate, 4-spored, smooth, thin-walled, hyaline, without a clamp connection, 34.1-42.7 × 9.7-13.3 μm. Cystidia absent. Basidiospores pentagonal or hexagonal with an acute tip, smooth, thin-walled, pale yellow, bearing guttules, 9.2-11.0 × 6.9-8.9 μm [Q = 1.23-1.33].

Specimen examined. Korea, Gangwon-do , Taebaek-si, Taebaeksan National Park, 37°06 ʹ 48.9 ʺ N, 128°56 ʹ 51.0 ʺ E, 915 m, mixed hardwood forest, scattered on the ground covered with fallen leaves near Danggol, 22 Aug 2019, Jae Young Park, SFC20190822-20 (NIBRFG0000505796) .

Notes - Entoloma pygmaeopapillatum is characterized by a brown striate pileus, 5-6 angled basidiospores with an acute tip ( Arnolds and Winterhoff, 1986). Entoloma pygmaeopapillatum is classified as Entoloma sect. Nolanea , subsect. Minuta ( Reschke et al., 2022) . Many species in subsect. Minuta have a basidiome with depressed center and fibrillose stipe ( Reschke et al., 2022), which accord with E. pygmaeopapillatum . According to the phylogenetic analysis, E. pygmaeopapillatum formed a monophyletic clade with high bootstrap value ( Fig. 6 ). Interestingly, the closely related species ( E. incanosquamulosum , E. minutum , E. ortonii , E. vindovonense ) were all collected in Europe ( Reschke et al., 2022). Also, reported specimens of E. pygmaeopapillatum were collect- ed in France, Germany, Slovakia ( Reschke et al., 2022), so this study is the first report of E. pygmaeopapillatum in Asia.

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).

Fig. 6. The phylogenetic tree of Entoloma bulakhae(SFC20150903-26 and SFC20150903-31), E. pygmaeopapillatum (SFC20190822-20), and E. subtenuicystidiatum (SFC20140624-04). The tree was constructed based on ITS gene datasets of the genus Entolma. Clitopilus hirneolus was used as an outgroup. The newly generated sequence is shown in blue and bold. Bootstrap support values more than 70 are shown.