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Pseudocercospora timorensis (Cooke) Deighton 1976
This fungus has received attention under the name Cercospora batatae Zimm. 1904, and is listed by APHIS as a Regulated Plant Pest in the United States. Cercospora “batatae” is the original spelling; the epithet has been corrected to "batatas". Hennings (1907) published an illegitimate later homonym based on a different type derived from the same original collection.
Chupp (1953) considered Cercospora batatas to be synonymous with Cercospora timorensis Cooke 1883, later transferred by Deighton to the genus Pseudocercospora as Pseudocercospora timorensis (Cooke) Deighton 1976. Pollack (1987), Little (1987) and Crous & Braun (2003) have accepted Chupp’s judgement that Cercospora batatas is a synonym of Pseudocercospora timorensis. Ramularia batatas Racib. 1900 and Cercospora ipomoeae-purpureae J.M. Yen 1965 are also listed by Crous & Braun (2003) as taxonomic synonyms of Pseudocercospora timorensis. The epithet timorensis has priority as the oldest name therefore the currently accepted scientific name for this fungus is Pseudocercospora timorensis (Cooke) Deighton 1976.
Nomenclature Report
Pseudocercospora timorensis (Cooke) Deighton 1976 (Ascomycetes, Mycosphaerellales)
≡ Cercospora timorensis Cooke 1883
= Cercospora batatas Zimm. 1904
Variant spelling Cercospora batatae Zimm. 1904
= Ramularia batatas Racib. 1900
Variant spelling Ramularia batatae Racib. 1900
= Cercospora ipomoeae-purpureae J.M. Yen 1965
≡ Pseudocercospora ipomoeae-purpureae (J.M. Yen) J.M. Yen 1980
Notes: Cercospora ipomoeae-indicae Sawada 1943 is a possible synonym (Chupp 1953).
Distribution: South America, Asia, Australia, Africa.
Substrate: Leaves.
Disease Note: Leaf spot. Listed by USDA APHIS as a Regulated Plant Pest.
Host: Ipomoea spp. including sweet potato (Convolvulaceae).
Supporting Literature:
Chupp, C. 1953. Monograph of the fungus genus Cercospora. Published by the Author, Ithaca, New York, 667 pages.
Crous, P.W., and Braun, U. 2003. Mycosphaerella and its anamorphs: 1. Names published in Cercospora and Passalora. Centraalbureau voor Schimmelcultures, Utrecht, 571 pages.
Deighton, F.C. 1976. Studies on Cercospora and allied genera. VI. Pseudocercospora Speg., Pantospora Cif. and Cercoseptoria Petr. Mycol. Pap. 140: 1-168.
García, C.E., Pons, N., and Benítez de Rojas, C. 1996. [Cercospora and similar fungi on Ipomoea species]. Fitopatol. Venez. 9: 22-36.
Little, S. 1987. Pseudocercospora timorensis. C.M.I. Descr. Pathog. Fungi Bact. 918: 1-2.
Pollack, F.G. 1987. An annotated compilation of Cercospora names. Mycol. Mem. 12: 1-212.
Updated on Sep 27, 2005
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Written by Erica Cline, October 12, 2005.
Suggested citation: Cline, E. Pseudocercospora timorensis. Systematic Mycology and Microbiology Laboratory, ARS, USDA. Retrieved November 21, 2009, from http://nt.ars-grin.gov/sbmlweb/OnlineResources/FungiOnline.cfm .
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