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Taxonomic re-evaluation of the genus Lambertella (Rutstroemiaceae, Helotiales) and allied stroma-forming fungi

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Abstract

The genus Lambertella is currently considered to be one of the largest genera in the family Rutstroemiaceae, and its major distinguishing character is the pigmentation of ascospores, besides a substratal stroma. Although Lambertella appears to be well-defined by morphological characters, its phylogenetic heterogeneity has been suggested in earlier studies. To circumscribe the genus more precisely, morphological examination and phylogenetic analysis was conducted on some Lambertella species and some allied stroma-forming fungi. In total, 58 taxa were included in the study, including 16 species with both a substratal stroma and pigmented ascospores. The polyphyly of Lambertella sensu lato was confirmed based on the phylogenetic analysis of ITS, LSU, and RPB2 regions. A highly supported clade is composed of five Lambertella species, including the type L. corni-maris. Morphologically, all species here included in Lambertella s. s. have brown ascospores prior to being discharged from asci, whereas in other species currently placed in Lambertella, but now excluded from the genus, they turn brown only after discharge. This clade was defined as Lambertella sensu stricto. Pigmentation of the ascospores was also recognized in Lanzia and Poculum, and even in the helotiaceous genus Hymenoscyphus, but always only after discharge. The convergent evolution of a dark substratal stroma in Rutstroemiaceae and Helotiaceae was also indicated.

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Acknowledgments

The work of this paper is the partial content of the doctoral thesis of the first author. The author would like to thank Prof. Yuichi Yamaoka and Prof. Makoto Kakishima (Tsukuba University, Japan) for the critical suggestions during the accomplishment of the thesis. H.O. Baral is thanked for valuable suggestions to the manuscript. This study was partially supported by the integrated research on biodiversity of interspecies relationships in the National Museum of Nature and Science, and by Grant-in-Aid for Scientific Research (B) 26291084.

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  1. National Museum of Nature and Science, Amakubo 4-1-1, Tsukuba, Ibaraki, 305-0005, Japan

    Yan-Jie Zhao, Kentaro Hosaka & Tsuyoshi Hosoya

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  1. Yan-Jie Zhao
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  2. Kentaro Hosaka
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  3. Tsuyoshi Hosoya
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Correspondence to Yan-Jie Zhao.

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Zhao, YJ., Hosaka, K. & Hosoya, T. Taxonomic re-evaluation of the genus Lambertella (Rutstroemiaceae, Helotiales) and allied stroma-forming fungi. Mycol Progress 15, 1215–1228 (2016). https://doi.org/10.1007/s11557-016-1225-5

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