Polyporales » Polyporaceae » Hirticrusta

Hirticrusta subradiata

Hirticrusta subradiata (Lloyd) Matozaki, T. Hatt. & Sotome 2020, in Matozaki et al., Mycoscience 61(5): 243 (2020)

Diagnosis: Basidiocarps annual, sessile, usually imbricate. Pileus semicircular to dimidiate, applanate, 2-4 cm wide, 2-8.5 cm long, up to 7 mm thick; surface zonate with velutinous zones and glabrous zones, buff to brown (5YR5/4-6, 10YR5-8/4-6) in velutinous zones, dark brown to blackish gray (5YR3-4/1,10YR3/1) in glabrous zones; margin thin, acute, entire. Context leathery to fibrous-corky, buff (10YR7-8/6), with a crustose layer recognizing in longitudinal section as a dark brown line below velutinous hairs, up to 5 mm thick; tissue darkening with KOH. Pore surface buff to light brown (10YR7-8/6, 5YR6/4-6), glancing, pores round to angular, 4-6(-7)/mm, dissepiments thin, entire. Tubes concolorous with pore surface, up to 2.5 mm deep. Hyphal system trimitic. Contextual generative hyphae sparse, thin-walled, with clamp connections, hyaline, 2-3.5 mm wide. Contextual skeletal hyphae dominant, unbranched, straight to sinuous, thick-walled to almost solid, light brown, IKI-, 3.5-5.5 mm wide. Contextual binding hyphae sparse, conspicuously branched, almost solid, pale yellow to light brown, IKI-, up to 2.5 mm wide. Tramal generative hyphae sparse, thin-walled, with clamp connections, hyaline, IKI-, 2.5-4 mm wide. Tramal skeletal hyphae dominant, unbranched, straight to sinuous, thick-walled to almost solid, light brown, IKI-, 1.5-2.5 mm wide. Tramal binding hyphae similar to contextual binding hyphae. Crustose layer in context composed of parallelly and densely arranged, but non-agglutinated hyphae. Cystidia absent. Basidia clavate, 17-23(-26) × 4-5.5 mm, with 4 sterigmata. Basidiospores hyaline, IKI-, cylindrical, thin-walled, smooth, (4-) 5-6 × 1.5-2 mm, 4.8 × 2.1 mm on average, Q =2-2.75, Qm =2.27 (n = 30/1). Distribution: Known from warm temperate areas of China and Japan (Ikeda, 2005; Ito, 1955; Kigawa, 1996; Li et al., 2014; Yasuda, 1913, 1914).

Index Fungrum Number: IF834690

Notes: Ryvarden (1990) incorrectly recognized Polyporus subradiatus as a synonym of Polyporus discipes Berk. [ = Fuscoporia discipes (Berk.) Y.C. Dai & Ghob.-Nejh.] based on examination of a Lloyd's specimen collected from South Africa. This species is characterized by semicircular to dimidiate and zonate pileus with velutinate tomentum on pileus surface, buff context with a thin but persistent crustose layer below tomentum, round to angular pores [4-6(-7)/mm] and cylindrical basidiospores. Ryvarden (1988) concluded that Polystictus neaniscus represents Trametes versicolor (L.) Lloyd without any comments. Despite the colored context of the holotype, Matozaki et al., 2020 consider that its context was originally white because of the almost hyaline skeletal and binding hyphae in the context. Consequently, Matozaki et al., 2020 agree with Ryvarden's conclusion of its identification.

 

Figure 1. Maximum likelihood tree generated using GTR þ G þ I for the combined ITS, nrLSU and RPB2 dataset. Branches are labeled with ML bootstrap proportions/MP bootstrap proportions/Bayesian posterior probabilities. Only nodes with both bootstrap values ≥ 50% and posterior probabilities ≥ 0.95 are labeled. Bold branches show where nodes supported with ML and MP bootstrap proportions = 50% and Bayesian posterior probabilities =1.00. T = holotypes.

 

Figure 2. Macroscopic features of Hirticrusta subradiata (TUMH 60638). A: Basidiocarp. B: Pore surface. Bars: A 1 cm; B 1 mm.

 

References:

Ikeda, Y. (2005). Mushrooms and toad stools pictured book of Hokuriku. Kanazawa: Hashimotokakubundo (in Japanese).

Ito, S. (1955). Mycological flora of Japan, 2. Tokyo: Yokendo. 1370811 (in Japanese).

Kigawa, S. (1996). Sarunokoshikake-rui kinoko-zukan [Picture book of bracket fungus] (in Japanese). Tokyo: Chikyu-sha.

Li, H. J., Li, X. C., Vlasak, J., & Dai, Y. C. (2014). Neofomitella polyzonata gen. et sp. nov., and N. fumosipora and N. rhodophaea transferred from Fomitella. Mycotaxon, 129, 7-20.

Matozaki, T., Hattori, T., Maekawa, N., Nakagiri, A., Ishikawa, N. K., & Sotome, K. (2020). Hirticrusta gen. nov. segregated from Neofomitella in Polyporaceae (Polyporales). Mycoscience, 61(5), 240-248.

Ryvarden, L. (1988). Type studies in the Polyporaceae 19. Species described by M. C. Cooke. Mycotaxon, 31, 45-58.

Ryvarden, L. (1990). Type studies in the Polyporaceae 22. Species described by C.G. Lloyd in Polyporus. Mycotaxon, 38, 83-102.

Yasuda, A. (1913) .(in Japanese). Mycological notes 16, 27 pp. 166e168). The Botanical Magazine.

Yasuda, A. (1914). (in Japanese). Mycological notes 32, 28 pp. 389-391). The Botanical Magazine.

 

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