Irpex subulatus (Ryvarden) Z.B. Liu & Y.C. Dai, comb. nov. (Fig. 4)

MycoBank no.—MB 841368

Basionym: Oxyporus subulatus Ryvarden, Nordic Journal of Botany 2(3): 280 (1982).

≡ Flavodon subulatus (Ryvarden) F. Wu, Jia J. Chen & Y.C. Dai, Mycologia 109(5): 761 (2017).

= Flavodon ambrosius D.R. Simmons, You Li, C.C. Bateman & J. Hulcr, Mycotaxon 131(2): 279 (2016).

Holotype:— Thailand. Cangwat Lamphum, Doi Inthanond, 20 February 1979, Ryvarden 17843

Description: See Hjortstam & Ryvarden (1982, as Oxyporus subulatus).

Specimens examined: CHINA. Henan Province, Xiuwu County, Yuntaishan, on fallen angiosperm trunk, 4 September 2009, B. K . Cui, Cui 7275 (BJFC 005762); Hubei Province, Shennongjia, Muyu, on fallen trunk of Celtis, 25 September 2004, Y. C . Dai, Dai 5929 (BJFC 010379, IFP 003711); Shanxi Province, Zhouzhi County, Taibaishan Nature Reserve, on fallen angiosperm trunk, 25 October 2006, H. S . Yuan, Yuan 2733 (BJFC 001406, IFP 003703); THAILAND. Chiang Mai, on fallen angiosperm trunk, 24 July 2016, Y. C . Dai, Dai 16719 (BJFC 022826) .

Notes: Simmons et al. (2016) described Flavodon ambrosius as a new species. In fact, we found that its description fits Oxyporus subulatus well, and its holotype (Hulcr 6853) sequences of ITS and LSU (ITS: KR 119072; LSU: KR 119075) are almost the same as those from Oxyporus subulatus . Wu et al. (2017) transferred Oxyporus subulatus to Flavodon based on the results of the phylogenetic analyses. Herein, we place this species in Irpex based on morphological and phylogenetic evidence (Fig. 1).