Hyphoderma nudicephalum Gilb. & M. Blackw.

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 : 77

Hyphoderma nudicephalum Gilb. & M. Blackw. ,

Mycotaxon 33: 378 (1988) [MB#134906]

( Figs. 1H and 2H )

Korean name: DZǙậNjŀġfflŷ

Basidiome resupinate, widely effused, thin. Hymenial surface crustaceous, smooth, partially poroid, few with cracks when dried, cream white, few light brown, margin concolorous with basidiome. Hyphal system monomitic, generative hyphae abundant, simple septate, frequently branched, with clamp connections, thin-walled, hyaline, 2.6-9.0 μm. Basidia cylindrical to subclavate, 4-spored, smooth, thin-walled, hyaline, with a clamp connection, 19.1-26.0 × 5.2-6.7 μm. Basidiospores cylindrical to narrowly cylindrical, smooth, thin-walled, bearing guttules, 8.4-9.9 × 3.9-5.1 μm [Q = 1.94-2.15]. Cystidia absent.

Specimen examined. Korea, Seoul, Gwanak-gu, Seoul National University Campus , 37°27 ʹ 32.6 ʺ N, 126°56 ʹ 49.8 ʺ E, 76 m, mixed hardwood forest, occurring on hardwood branch, 08 Jan 2015, Y. W. Lim, SFC20150108-26 ( NIBR FG0000139942 ) ; Korea, Gyeonggi-do, Anyang-si, Seoul National University Arboretum , 37°25 ʹ 11.2 ʺ N, 126°56 ʹ 08.0 ʺ E, 97 m, mixed hardwood forest, occurring on hardwood branch, 13 Jan 2015, Y. W. Lim, SFC20150113-05 (NIBRFG0000139943) ; Korea, Jeollanam-do, Jindo-gun, Byeongpung Island , 34°58 ʹ 06.3 ʺ N, 126°12 ʹ 24.1 ʺ E, 41 m, hardwood forest, occurring on the hardwood branch, 04 Jul 2018, J. Y. Park, SFC20180704-83 (NIBRFG0000514 542).

Notes - Hyphoderma Wallr. is a white-rot fungus, and about 110 species have been described worldwide from tropical to temperate regions( Wu, 1997; Nakasone, 2008; Baltazar et al., 2016; Martín et al., 2018; Guan and Zhao, 2021; Ma et al., 2021; Qian-Xin and Chang-Lin, 2021; Duan et al., 2023). In Korea, eight species are listed as Hyphoderma ( Cho and Oh, 1996; Kim et al., 2009; Jang et al., 2016a; Jang et al., 2016b). According to the phylogenetic analysis, H. nudicephalum formed a monophyletic clade with high bootstrap value ( Fig. 8 ). Hyphoderma nudicephalum is a member of H. setigerum complex ( Wu, 1997). Hyphoderma nudicephalum shows distinguishable morphological characteristics compared to H. setigerum and H. subsetigerum , representative species in H. setigerum complex ( Wu, 1997). The basidiospore size of H. setigerum (7.5-12.5 × 3.5-5 μm) and H. subsetigerum (6- 8 × 2.8-3.2 μm) are smaller than H. nudicephalum ( Wu, 1997) . In the original description, capitate and encrusted cystidia were described( Gilbertson and Blackwell, 1988), but cystidia were not observed in our specimens. The host trees of our specimens were all angiosperm trees, which accords with the original description ( Gilbertson and Blackwell, 1988).

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. 8. The phylogenetic tree of Hyphoderma nudicephalum (SFC20150108-26, SFC20150113-05, and SFC20180704-83) and H. tenue (KUC20180919-27). The tree was constructed based on ITS and LSU gene datasets of the genus Hyphoderma. Physisporinus tibeticus was used as an outgroup. The newly generated sequence is shown in blue and bold. Bootstrap support values more than 70 are shown.