Baorangia alexandri Svetash., Simonini & Vizzini

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 : 72

Baorangia alexandri Svetash., Simonini & Vizzini ,

Persoonia 40: 265 (2018) [MB#825173]

( Figs. 1B and 2B )

Korean name: ọũNjƎāfflŷďNjffi

Pileus convex, margin straight, even, 30-60 mm in diam. Pileus surface smooth, dark pink to pale red. Pore surface pale yellow, round to angular pores, 4-6 per mm. Stipe central, equal, slightly clavate at the bottom, 30- 50 × 5-15 mm, surface smooth, concolorous with pileus, pruinose and light yellow at bottom. Hyphal system monomitic, generative hyphae simple septate, branched, interwoven, without clamp connections, thin-walled, hyaline, 2.6-4.7 μm. Basidia subclavate to cylindrical, 4-spored, smooth, thin-walled, lightly pale brown, with a clamp connection, 22.5-41.4 × 5.1-8.2 μm. Cystidia cylindrical, smooth, thin-walled, hyaline, without a clamp connection, 36.9-55.4 × 5.0-7.4 μm. Basidiospores rare, narrowly cylindrical, thin-walled, yellowish brown, 9.6- 11.2 × 3.9-4.4 μm [Q = 2.46-2.55].

Specimen examined. Korea, Gyeongsangbuk-do, Cheongsong-gun, Juwangsan National Park, 36°23 ʹ 43.9 ʺ N, 129° 09 ʹ 15.0 ʺ E, 348 m, mixed hardwood forest, occurring solitary on the ground near Yongchu Falls , 31 Jul 2019, S. Jang and S. L. Kwon, KUC20190731-65 (NIBRFG000 0506143) .

Notes - Baorangia G. Wu & Zhu L. Yang is a recently separated novel genus, which was considered as the Boletus bicolor clade ( Wu et al., 2014; 2016). Seven species are accepted as Baorangia ( Wu et al., 2016; Crous et al., 2018; Phookamsak et al., 2019; Zhang et al., 2021), and among them, two species are reported in Korea as Boletus ( Bo. bicolor and Bo. pseudocalopus ). In the original description, the type specimen has wider stipe (30-70 × 10-25 mm) and basidia, (25.5-30.5 × 8.0- 9.5 μm) and fusiform cystidia were observed ( Crous et al., 2018). Additional observations for cystidia and basidiospores are required for accurate identification. In the phylogenetic tree, Ba. pseudocalopus is the sister species of Ba. alexandri ( Fig. 4 ). However, Ba. pseudocalopus has a grayish or brownish pileus, and slightly bigger basidiospores (9.0-12.5 × 4.0-5.0 μm) ( Wu et al., 2016). Baorangia alexandri is a rare species globally, only reported from a single area (Primorsky Krai, Far East Russia) ( Crous et al., 2018). Therefore, this study is significant for the discovery of a globally rare species and the first report of Ba. alexandri in the temperate region.

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. 4. The phylogenetic tree of Baorangia alexandri (KUC2019 0731-65). The tree was constructed based on ITS gene datasets of the genus Baorangia. Butyriboletus roseoflavus was used as an outgroup. The newly generated sequence is shown in blue and bold. Bootstrap support values more than 70 are shown.