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Hashimoto A, Hirayama K, Takahashi H, Matsumura M, Okada G, Chen C, Huang J, Kakishima M, Ono T, Tanaka K. Resolving the Lophiostoma bipolare complex: Generic delimitations within Lophiostomataceae. Stud Mycol 2018; 90:161-189. [PMID: 29632417 PMCID: PMC5889712 DOI: 10.1016/j.simyco.2018.03.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Lophiostoma bipolare was taxonomically revised based on the morphological observations and phylogenetic analyses of molecular data from nuclear rDNA SSU-ITS-LSU, TUB, tef1, and rpb2 genes. Twenty-nine strains were morphologically similar to Lo. bipolare. A total of 174 sequences were generated from the Lo. bipolare complex. Phylogenetic analyses based on TUB sequence revealed 11 distinct species within the Lo. bipolare complex. Morphological features of the ascospores and the anatomical structure of the ascomata from both field collections as well as axenic culture, which have been reported previously as variable features at intraspecific levels, were compared to evaluate the taxonomic reliability of these features. To clarify the generic position of the 11 species, phylogenetic analyses were done on SSU-ITS-LSU-tef1-rpb2 gene sequences. The Lo. bipolare complex shared phylogenetic relationships with Pseudolophiostoma and Vaginatispora, and formed an additional five distinct clades from other members of Lophiostomataceae. According to its phylogenetic position, Lo. bipolare sensu stricto was distantly related to Lophiostoma s. str., and formed an independent clade within Lophiostomataceae. Lophiostoma bipolare s. str. could be distinguished from the other lophiostomataceous genera by the clypeus around the ostiolar neck and by the thin and uniformly thick peridium. A novel genus described as Lentistoma was established to accommodate this species, and the epitypification of Lentistoma bipolare (basionym: Massarina bipolaris) was proposed. Other lineages of the Lo. bipolare complex could not be separated on the basis of the ascospore size and sheath variations, but were distinguished based on ascomatal features, such as the existence of the clypeus, brown hyphae surrounding the peridium, and the contexture of the peridium, which were stable indicators of generic boundaries in Lophiostomataceae. Four additional new genera with five new species were recognised based on these morphological differences: Crassiclypeus (C. aquaticus), Flabellascoma (F. cycadicola and F. minimum), Leptoparies (Lep. palmarum), and Pseudopaucispora (Pseudop. brunneospora). Three new species were added to Pseudolophiostoma (Pseudol. cornisporum, Pseudol. obtusisporum, and Pseudol. tropicum) and two new species were added to Vaginatispora (V. amygdali and V. scabrispora). The re-evaluation of the validity of several previously recognised genera resulted in the introduction of two new genera with new combinations for Lophiostoma pseudoarmatisporum as Parapaucispora pseudoarmatispora and Vaginatispora fuckelii as Neovaginatispora fuckelii.
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Key Words
- 1 new typification
- 21 new taxa
- Crassiclypeus A. Hashim., K. Hiray. & Kaz. Tanaka
- Crassiclypeus aquaticus A. Hashim., K. Hiray. & Kaz. Tanaka
- Flabellascoma A. Hashim., K. Hiray. & Kaz. Tanaka
- Flabellascoma cycadicola A. Hashim., K. Hiray. & Kaz. Tanaka
- Flabellascoma minimum A. Hashim., K. Hiray. & Kaz. Tanaka
- Freshwater fungi
- Lentistoma A. Hashim., K. Hiray. & Kaz. Tanaka
- Lentistoma bipolare (K.D. Hyde) A. Hashim., K. Hiray. & Kaz. Tanaka
- Leptoparies A. Hashim., K. Hiray. & Kaz. Tanaka
- Leptoparies palmarum A. Hashim., K. Hiray. & Kaz. Tanaka
- Massarina bipolaris K.D. Hyde
- Neovaginatispora A. Hashim., K. Hiray. & Kaz. Tanaka
- Neovaginatispora fuckelii (Sacc.) A. Hashim., K. Hiray. & Kaz. Tanaka
- Parapaucispora A. Hashim., K. Hiray. & Kaz. Tanaka
- Parapaucispora pseudoarmatispora (Hay. Takah. et al.) A. Hashim., K. Hiray. & Kaz. Tanaka
- Pleosporales
- Pseudolophiostoma cornisporum A. Hashim., K. Hiray. & Kaz. Tanaka
- Pseudolophiostoma obtusisporum A. Hashim., K. Hiray. & Kaz. Tanaka
- Pseudolophiostoma tropicum A. Hashim., K. Hiray. & Kaz. Tanaka
- Pseudopaucispora A. Hashim., K. Hiray. & Kaz. Tanaka
- Pseudopaucispora brunneospora A. Hashim., K. Hiray. & Kaz. Tanaka
- Species complex
- Systematics
- Taxonomy
- Vaginatispora amygdali A. Hashim., K. Hiray. & Kaz. Tanaka
- Vaginatispora scabrispora A. Hashim., K. Hiray. & Kaz. Tanaka
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Affiliation(s)
- A. Hashimoto
- Faculty of Agriculture and Life Sciences, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
- Research Fellow of the Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
| | - K. Hirayama
- Apple Experiment Station, Aomori Prefectural Agriculture and Forestry Research Center, 24 Fukutami, Botandaira, Kuroishi, Aomori 036-0332, Japan
| | - H. Takahashi
- Faculty of Agriculture and Life Sciences, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - M. Matsumura
- Faculty of Agriculture and Life Sciences, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
- The United Graduate School of Agricultural Sciences, Iwate University, 18–8 Ueda 3 chome, Morioka, Iwate 020-8550, Japan
| | - G. Okada
- Japan Collection of Microorganisms, RIKEN BioResource Center, 3-1-1 Koyadai, Tsukuba, Ibaraki 305-0074, Japan
| | - C.Y. Chen
- National Chung Hsing University, 145 Xingda Rd., South Dis., Taichung 402, Taiwan, ROC
| | - J.W. Huang
- College of Agriculture and Natural Resources, National Chung Hsing University, 250 Kuo-kuang Rd., Taichung 402, Taiwan, ROC
| | - M. Kakishima
- Engineering Research Center of Chinese Ministry of Education for Edible and Medicinal Fungi, Jilin Agricultural University, Changchun, Jilin Province 130118, China
- Faculty of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan
| | - T. Ono
- Ogasawara Subtropical Branch of Tokyo Metropolitan Agriculture and Forestry Research Center, Chichijima, Ogasawara-mura, Tokyo 100-2101, Japan
| | - K. Tanaka
- Faculty of Agriculture and Life Sciences, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
- The United Graduate School of Agricultural Sciences, Iwate University, 18–8 Ueda 3 chome, Morioka, Iwate 020-8550, Japan
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