Abstract
Shiraiaceae is an important family in Pleosporales (Dothideomycetes), which includes medical fungi and plant pathogens. Two hypocrellin-producing taxa, Shiraia bambusicola and a novel genus Rubroshiraiagen. nov., typified by Rubroshiraia bambusae are treated in this article. Maximum likelihood analysis, generated via RAxML (GTR+G model), using a combined SSU, LSU, TEF1 and RPB2 sequence dataset, shows that Rubroshiraia is close to Shiraia and belongs to the family Shiraiaceae. Descriptions, illustrations and a taxonomic key are provided for the genera in Shiraiaceae. Rubroshiraia morphologically differs from Shiraia in having small and dark ascostromata and filiform ascospores. Production of the ascostromatal metabolites, hypocrellin A and B, were examined by HPLC and spectrophotometer. The content of hypocrellin A and B of specimen HKAS 102255 (R. bambusae) is twice that produced by HKAS 102253 (S. bambusicola). To clarify the relationship between R. bambusae and Hypocrella bambusae, type material of the latter was examined and provided the illustration.
Highlights
Liu et al (2013) introduced the family Shiraiaceae Y.X
To clarify the family placement of newly established taxa, maximum likelihood phylogenetic analysis was generated from RAxML (GTR+G model), based on combined small subunit rDNA (SSU), large subunit rDNA (LSU), TEF1 and RPB2 sequences data (Fig. 2)
Shiraia and Rubroshiraia have more or less similar ascostromata and both of them can produce the metabolite hypocrellins. They can be phylogenetically distinguished with high bootstrap support (100/1.00 MLBS/BSPP) (Fig. 2)
Summary
Liu et al (2013) introduced the family Shiraiaceae Y.X. Liu, Zi Y. Liu & K.D. Hyde which is typified by Shiraia Henn. Ariyawansa et al (2013) accommodated Grandigallia M.E. Barr, Hanlin, Cedeño, Parra & R. In Shiraiaceae since it morphologically resembles Shiraia. Subsequent publications by Wijayawardene et al (2014, 2017, 2018) agreed with this placement and, the family currently comprises two genera
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