Scytinostroma acystidiatum Q.Y. Zhang, L.S. Bian

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 : 81-82

Scytinostroma acystidiatum Q.Y. Zhang, L.S. Bian &

Q. Chen, Frontiers in Cellular and Infection Microbiology 564(1): 13 (2023) [MB#848524] ( Figs. 1N and 2N ) Korean name: ĕƚǵ"űŀġfflŷ

Basidiome annual, resupinate, effused, thin. Hymenial surface coriaceous, smooth, slightly cracked, pale yellow, margin white. Hyphal system dimitic, generative hyphae simple septate, rarely branched, without clamp connections, thin-walled, hyaline, 1.4-2.1 μm. Skeletal hyphae aseptate, frequently branched, interwoven, without clamp connections, thick-walled, hyaline, 1.9-2.8 μm. Basidia subclavate to cylindrical, 4-spored, smooth, thin-walled, hyaline, with a basal clamp connection, 10.5-19.0× 2.6- 4.5 μm. Cystidia rare, cylindrical, slightly bent, 20.9- 26.3 × 4.3-5.1 μm. Basidiospores narrowly ellipsoid to cylindrical, smooth, thin-walled, hyaline, 3.5-5.1 × 2.0- 2.8 μm [Q = 1.75-1.82].

Specimen examined. Korea, Gyeongsangbuk-do, Cheongsong-gun, Juwangsan National Park, 36°26 ʹ 26.0 ʺ N, 129° 08 ʹ 17.6 ʺ E, 346 m, mixed hardwood forest, occurring on hardwood branch near Dalgi Falls , 20 Jun 2019, S. Jang and S. L. Kwon, KUC20190620-28 (NIBRFG0000506 080) .

Notes - Scytinostroma Donk is a white-rot corticioid fungus, and 36 species have been reported worldwide ( Donk, 1956; Nakasone, 2008; Wang et al., 2020; Zhang et al., 2023). Two species have been reported in Korea ( Lee et al., 2004; Park et al., 2017). Scytinostroma acystidiatum is characterized by resupinate and coriaceous pale yellow basidiome, and dimitic hyphal system ( Zhang et al., 2023). Morphologically, KUC20190620-28 has smaller basidiospores compared to original description, (4.5-)4.7- 7 × (3-)3.5-4.7(-5) μm ( Zhang et al., 2023). Also, cystidia were not described in the original description ( Zhang et al., 2023), but few cystidia was observed in our specimen. In the phylogenetic analysis, Sc. renisporum is grouped with Sc. acystidiatum with high bootstrap value ( Fig. 12 ). However, Sc. renisporum has membranaceous basidiome and larger cystidia, 20-35 × 6-10 μm ( Boidin and Lanquetin, 1987). Furthermore, KUC 20121019 -32 was previously reported as Lachnocladiaceae sp. 1 in Jang et al. (2016b), and it was figured out as Sc. acystidiatum in this study.

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. 12. The phylogenetic tree of Scytinostroma acystidiatum(KUC20121019-32 and KUC20190620-28). The tree was constructed based on ITS gene datasets of the genus Scytinostroma. Confertobasidium olivaceoalbum was used as an outgroup. The newly generated sequence is shown in blue and bold. Bootstrap support values more than 70 are shown.