This study will define the taxonomy of three major genera of the Nectriaceae: Nectria, Cosmospora, and Neonectria. These genera are significant because they include several species that are widespread plant pathogens and potential biological control agents of insects. None of these genera have received modern monographic treatment. The proposed monographic projects include: (1) Nectria with Tubercularia asexual states, a group of about 30–40 taxa. Most species of Nectria occur on recently dead hardwood trees in temperate and tropical regions. (2) Cosmospora with asexual states in acremonium-like, Chaetopsina, Fusarium sect. Eupionnotes, Stilbella, verticillium-like, and Volutella. Cosmospora occur primarily on stromatic fungi and insects. (3) Neonectria with Cylindrocarpon asexual states. This genus includes species that cause cankers on hardwood and conifer trees in temperate and tropical regions, a subgroup common on recently dead woody plants in the tropics, and another group isolated from soil. The taxonomy of these genera will be studied using morphology, microscopy, cultural characteristics, and DNA-sequence analyses.
Two graduate students and one post-doc will be trained in this project. Catalina Salgado (Ph.D. student) is working with Neonectria/Cylindrocarpon. Cesar S. Herrera (Ph.D. student) is working on Cosmospora. Dr. Yuuri Hirooka (post-doc) is working with Nectria.
This project is funded by the National Science Foundation (NSF) more specifically by a program entitled "Partnerships for Enhancing Expertise in Taxonomy (PEET)." Principal investigators in this project are Dr. Priscila Chaverri, Dr. Amy Rossman (ARS, USDA), and Dr. Gary Samuels (ARS, USDA). Project period Sep. 2007 - Aug. 2013.
MONOGRAPHS AND BOOKS:
Hirooka, Y., Rossman, A.Y., Samuels, G.J., Lechat, C., Chaverri, P. 2012. A monograph of Allantonectria, Nectria, and Pleonectria (Nectriaceae, Hypocreales, Ascomycota) and their pycnidial, sporodochial, and synnematous anamorphs. Studies in Mycology 71: 1-210. (Free via Open Access)
Chaverri, P., Huhndorf, S., Rogers, J., Samuels, G.J. 2010. Microhongos Comunes de Costa Rica y otras regiones tropicales (Ascomycota, Pezizomycotina, Sordariomycetes). Common Microfungi of Costa Rica and other tropical regions (Ascomycota, Pezizomycotina, Sordariomycetes). INBio Editorial: Heredia. 241 pp. + 60 Pl. (Book)
IN PEER-REVIEWED JOURNALS:
Herrera, C.S., Rossman, A.Y., Samuels, G.J., Chaverri, P. 2013. Pseudocosmospora - a new genus to accommodate Cosmospora vilior and related species. Mycologia (accepted)
Herrera, C.S., Rossman, A.Y., Samuels, G.J. Lechat, C., Chaverri, P. 2013. Revision of the genus Corallomycetella with Corallonectria gen. nov. for C. jatrophae (Nectriaceae, Hypocreales). Mycosystema 32: 518-544 (special volume dedicated to R.F. Korf). PDF
Hirooka, Y., Rossman, A.Y., Zhuang, W-Y., Salgado, C., Chaverri, P. 2013. Species delimitation for Neonectria coccinea group including the causal agents of beech bark disease (BBD) in Asia, Europe, and North America. Mycosystema 32: 485-517 (special volume dedicated to R.F. Korf). PDF
Rossman, A.Y., Seifert, K.A., Samuel, G.J., Minnis, A.M., Schroers, H.-J., Lombard, L., Crous, P.W., Põldma, K., Cannon, P.F., Summerbel, R.C., Geiser, D.M., Zhuan, W.-Y., Hirooka, Y., Herrera, C., Salgado-Salazar, C., Chaverri, P. 2013. Genera in Bionectriaceae, Hypocreaceae, and Nectriaceae (Hypocreales) proposed for acceptance or rejection. IMA Fungus 4: 41-51. PDF
Salgado, C., Rossman, A.Y, Samuels, G.J., M. Capdet, Chaverri, P. 2012. Multigene phylogenetic analyses of the Thelonectria coronata and T. veuillotiana species complexes. Mycologia 104: 1325-1350. PDF
Schoch, C.L., Seifert, K.A., Huhndorf, S., Robert, V., Spouge, J.L., Levesque, A.,Chen, W., and Fungal Barcoding Consortium*. 2012. Nuclear ribosomal internal transcribed spacer (ITS) region as a universal DNA barcode marker for Fungi. Proc. Nat. Acad. Sci. 109: 6241-6246. *P. Chaverri is part of the Fungal Barcoding Consortium. PDF
Hirooka, Y., Rossman, A.Y., Chaverri, P. 2011. Morphological and phylogenetic analyses of the Nectria cinnabarina species complex. Studies in Mycology 68: 35-56. Free via Open Access
Chaverri, P., Salgado, C., Hirooka, Y., Rossman, A.Y., Samuels, G.J. 2011. Delimitation of Neonectria and Cylindrocarpon and related genera with Cylindrocarpon-like anamorphs. Studies in Mycology 68: 57-78. Free via Open Access
Hirooka, Y., Kobayashi, T., Ono, T., Rossman, A.Y., Chaverri, P. 2009. Verrucostoma, a new genus in the Bionectriaceae from the Bonin Islands, Japan. Mycologia 102: 418-429. PDF
Samuels G.J., Lu B.-S., Chaverri P., Candoussau F., Fournier J., Rossman A.Y. 2009. Cyanonectria, a new genus for Nectria cyanostoma and its Fusarium anamorph. Mycological Progress 8: 49-58. PDF
Rossman A.Y.; Farr D.F.; Akulov A.Y. (2008) Cosmospora stegonsporii Rossman, Farr & Akulov, sp. nov. Fungal Planet 23: 1.
USEFUL NECTRIACEAE RESOURCES AND LINKS
Database of Nectria sensu lato names: A searchable database of names in Nectria created at the Systematic Mycology and Microbiology Lab (USDA, ARS). This database includes many names under Nectria, nomenclature, authorities, and some notes about their taxonomy.
Hypocreales of the Southeastern United States: This is a web-based interactive identification key with descriptions and illustrations.
SMML-USDA-ARS fungal databases: The Systematic Mycology and Microbiology Lab (USDA, ARS) mantains several searchable databases. These are: Specimens at the U.S. National Fungus Collection (BPI), Fungus-Host Distributions, Literature, Index to Saccardo's Sylloge Fungorum, and Nomenclature.