Abstract
Triblidiaceae (Rhytismatales) currently consists of two genera: Triblidium and Huangshania. Triblidium is the type genus and is characterised by melanized apothecia that occur scattered or in small clusters on the substratum, cleistohymenial (opening in the mesohymenial phase), inamyloid thin-walled asci and hyaline muriform ascospores. Before this study, only the type species, Triblidium caliciiforme, had DNA sequences in the NCBI GenBank. In this study, six specimens of Triblidium were collected from China and France and new ITS, mtSSU, LSU and RPB2 sequences were generated. Our molecular phylogenetic analysis and morphological study demonstrated three new species of Triblidium, which are formally described here: T. hubeiense, T. rostriforme and T. yunnanense. Additionally, our results indicated that Huangshania that was considered to be distinct from Triblidium because of its elongated, transversely-septate ascospores, is congeneric with Triblidium. Therefore, we have placed Huangshania in synonymy under Triblidium, rendering Triblidiaceae a monotypic family.
Highlights
Triblidium Rebent.: Fr. is the type genus of Triblidiaceae Rehm (Rehm 1888−1896, 1912), which includes presumed saprobes on the bark of Pinaceae, Ericaceae and Fagaceae (Magnes 1997)
The morphological characteristics of the species described here are typical of Triblidium (Magnes 1997): ascomata on twigs of Rhododendron spp., muriform, inamyloid ascospores, and highly melanized ascomata with roughened outer surfaces
The sequences generated from the specimens of T. caliciiforme collected from France on bark of Quercus sp., clustered well with other sequences accepted as T. caliciiforme by Karakehian et al (2019)
Summary
Triblidium Rebent.: Fr. is the type genus of Triblidiaceae Rehm (Rehm 1888−1896, 1912), which includes presumed saprobes on the bark of Pinaceae, Ericaceae and Fagaceae (Magnes 1997). In his monograph of the family, Magnes (1997) speculated that some species may exist in an endophytic state. The results of a three-gene phylogenetic analysis with expanded sampling by Karakehian et al (2019) supported Magnes classification and the authors emended Triblidiaceae to include Triblidium and Huangshania
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