Steccherinum straminellum (Bres.) Melo

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 : 82

Steccherinum straminellum (Bres.) Melo ,

Mycotaxon 54: 126 (1995) [MB#414192]

( Figs. 1O and 2O )

Korean name: ḵ"Ṙẖfflŷ

Basidiome annual, resupinate, effused, thin. Hymenial surface corky, tuberculate, aculei up to 0.4 mm, fibrillose at the margin, very pale yellow, margin white. Hyphal system dimitic, generative hyphae simple septate, branched, with clamp connections, thin-walled, hyaline, 2.1-3.4 μm. Skeletal hyphae aseptate, unbranched, without clamp connections, thick-walled, hyaline, 2.7-4.5 μm. Basidia subclavate to cylindrical, 4-spored, smooth, thin-walled, hyaline, with a basal clamp connection, 14.8-22.2 × 3.7-5.5 μm. Basidiospores narrowly ellipsoid to cylindrical, smooth, thin-walled, hyaline, bearing few guttules, 3.1- 4.8× 1.9-2.5 μm [Q = 1.63-1.92]. Cystidia rare.

Specimen examined. Korea, Gyeongsangbuk-do, Cheongsong-gun, Juwangsan National Park , 36°22 ʹ 19.0 ʺ N, 129° 11 ʹ 06.2 ʺ E, 388 m, mixed hardwood forest, occurring on rotten Pinus branches near Jeolgol, 01 Nov 2018, S. Jang and S. L. Kwon, KUC20181101-53 (NIBRFG0000514 361) .

Notes - Steccherinum Gray is a wood-inhabiting genus, and approximately 80 species are accepted worldwide ( Fries, 1821; Banker, 1912; Cunningham, 1958; Lindsey and Gilbertson, 1979; Melo, 1995; Spirin et al., 2007; Hjortstam and Ryvarden, 2008; Bernicchia and Gorjón, 2010; Westphalen et al., 2021; Dong et al., 2023). In Korea, seven species have been reported ( Jung, 1996; Kim et al., 2009; Kim et al., 2015b; Jang et al., 2016b; Park et al., 2018). Steccherinum straminellum is characterized by corky and tuberculate hymenial surface with aculei, and narrowly ellipsoid to cylindrical basidiospores ( Melo, 1995). KUC20181101-53 is well matched with the original description ( Melo, 1995). According to the phylogenetic analysis, St. straminellum is grouped with St. ciliolatum and St. punctatum ( Fig. 13 ). St. ciliolatum has dimitic hyphal system, and cylindrical basidiospores [Q = 1.81- 2.04] ( Maas Geesteranus, 1974), similar with St. straminellum . However, St. punctatum has monomitic hyphal system, and wider basidiospores, 3.6-4.5 × 2.6-3.4 μm ( Melo, 1995).

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. 13. The phylogenetic tree of Steccherinum straminellum (KUC201811101-53). The tree was constructed based on ITS and LSU gene datasets of the genus Steccherinum. Loweomyces fractipes was used as an outgroup. The newly generated sequence is shown in blue and bold. Bootstrap support values more than 70 are shown.