Laetiporus versisporus (Lloyd) Imazeki

Cho, Hae Jin, Lee, Hyun, Li, Vladimir, Jargalmaa, Suldbold, Kim, Nam Kyu & Lim, Min-Ji Kim and Young Woon, 2018, Six unrecorded macrofungi from the Royal Tombs (Donggureung and Seooreung) of the Joseon Dynasty and Jongmyo Shrine, Korea, Journal of Species Research 7 (1), pp. 1-8 : 6

Laetiporus versisporus (Lloyd) Imazeki , Bulletin of the Tokyo Science Museum 6: 88 (1943)

Hierarchy: Basidiomycota, Polyporales , Fomitopsidaceae

Specimens examined: KOREA, Seoul, Jongmyo shrine, 37°34 ʹ 30 ʺ N, 126°59 ʹ 32 ʺ E, 23 Jul 2015, Hyun Lee, Young Woon Lim, SFC20150723-24 (GenBank accession No. MF 445228), on the live stem of Quercus spp .

Basidiocarps annual, laterally substipitate, sometimes imbricate. Pileus dimidiate to flabelliform, 70-210 mm, surface glabrous, azonate, radially furrowed, vivid yellow (3A8) to deep orange (5A8) when fresh, becoming paler in age. Pore surface pale yellow to yellow, pores angular, 4-5 per mm, with entire dissepiments that easily torn.

Hyphal system dimitic, clamp connection absent. Generative hyphae in context hyaline, thin-walled, sometimes branched, 7-11 μm in diameter. Skeletal hyphae in context thick-walled, much branched, 8-16 μm in diameter. Generative hyphae in tube hyaline, thin-walled, 2.5-4 μm in diam. Skeletal hyphae in tube thick-walled, solid, 2-5 μm in diameter. Cystidia absent. Basidia 14.8-18.0- 21.3 × 6.1-6.7-7.8 μm, clavate, 2 or 4-spored, simple septate at the base. Basidiospores 5.3-6.0-7.2 × 4.4-5.1- 5.2 μm, Q = 1.0-1.2-1.3, globose to broadly ellipsoidal.

Remarks: Laetiporus versisporus used to be misidentified to L. sulphureus in Korea for a long time because of similar morphology. In the Indexfungorum (http://www. indexfungorum.org/), L. versisporus is also recorded as a synonym of L. sulphureus . However, recent phylogenetic studies showed that L. sulphureus and L. versisporus are different species ( Ota et al., 2009; Song et al., 2014). Moreover, European L. surphureus differs from L. versisporus by more ellipsoidal basidiospores. Sometimes L. versisporus makes anamorphic form of basidiocarp which has brownish and powdery pileus ( Ota et al., 2009).