Mycologia
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DOI: 10.3852/mycologia.97.2.433
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Mycologia, 97(2), 2005, pp. 433-443.
© 2005 by The Mycological Society of America

The genus Podocrella and its nematode-killing anamorph Harposporium


Priscila Chaverri 1

     Department of Plant Pathology, Cornell University, 334 Plant Science Building, Ithaca, New York 14853

Gary J. Samuels

     USDA-ARS, Systematic Botany and Mycology, Laboratory, Room 304, B-011A, 10300 Baltimore, Ave., Beltsville, Maryland 20705

Kathie T. Hodge

     Department of Plant Pathology, Cornell University, 334 Plant Science Building, Ithaca, New York 14853

Several genera are described in the literature as having morphology similar to the clavicipi-taceous genus Podocrella, viz. Atricordyceps, Ophiocordyceps, Wakefieldiomyces and "Cordyceps" peltata. These genera have capitate-stipitate stromata that gradually expand into a horizontally flattened fertile head that is dark, has strongly protruding perithecia and asci containing eight multiseptate filiform ascospores. These ascospores disarticulate at the middle septum to form two lanceolate multiseptate part-ascospores. In this study several specimens of the above-mentioned genera, including the types, were examined to determine whether they are congeneric with Podocrella. This study also reveals the connection of Podocrella to its anamorph genus, Harposporium, and its relationship to several other clavicipitaceous genera, based on cultural data and large subunit nuclear ribosomal DNA (LSU) sequences. Nematode predation of the Harposporium anamorph of P. peltata is demonstrated. The results show Podocrella and selected Harposporium LSU sequences form a mono-phyletic group and that this clade is closely related to Aschersonia. A new species of Podocrella from Costa Rica, P. fusca, is described, new combinations made for P. peltata and P. harposporifera, and a key to the known species is presented.

Key words: Anamorph-teleomorph connection, Ascomycota, Clavicipitaceae, Hirsutella, Hypocreales, large subunit nuclear ribosomal DNA, molecular phylogenetics, synanamorphs, systematics

1 Corresponding author. Current address: USDA-ARS, Systematic Botany and Mycology Laboratory, Room 304, B-011A, 10300 Baltimore Ave., Beltsville, Maryland 20705. Email: pc234{at}cornell.edu






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Copyright © 2005 by The Mycological Society of America.