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Phytophthora alni sp. nov. and its variants: designation of emerging heteroploid hybrid pathogens spreading on Alnus trees

Published online by Cambridge University Press:  01 October 2004

Clive M. BRASIER ,
Susan A. KIRK ,
Jose DELCAN ,
David E. L. COOKE ,
Thomas JUNG  and
Willem A. MAN IN'T VELD
Clive M. BRASIER
Affiliation:
Forest Research Agency (FRA), Farnham, Surrey GU10 4LH, UK. E-mail: clive.brasier@forestry.gsi.gov.uk
Susan A. KIRK
Affiliation:
Forest Research Agency (FRA), Farnham, Surrey GU10 4LH, UK. E-mail: clive.brasier@forestry.gsi.gov.uk
Jose DELCAN
Affiliation:
Forest Research Agency (FRA), Farnham, Surrey GU10 4LH, UK. E-mail: clive.brasier@forestry.gsi.gov.uk
David E. L. COOKE
Affiliation:
Scottish Crop Research Institute (SCRI), Invergowrie, Dundee, DD2 5DA, UK.
Thomas JUNG
Affiliation:
Bavarian State Institute of Forestry (LWF), Section of Forest Ecology and Forest Protection, Am Hochanger 11, D-85354 Freising, Germany.
Willem A. MAN IN'T VELD
Affiliation:
Netherlands Plant Protection Service (NPD), PO Box 9102, 6700 Wageningen, The Netherlands.
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Abstract

In 1993 a destructive new Phytophthora pathogen of riparian Alnus trees was discovered in the UK and subsequently shown to be present in other parts of Europe. The new Phytophthora comprised a group of emergent heteroploid hybrids, probably between P. cambivora and a species related to P. fragariae. These included a common, near tetraploid standard hybrid, the presumptive allopolyploid; and four scarcer major variant types with chromosome numbers intermediate between diploid and tetraploid, named the Swedish, Dutch, German and UK variants. The standard hybrid type is formally designated here as Phytophthora alni subsp. alni. The Swedish variant is designated as P. alni subsp. uniformis; and the Dutch, German and UK variants collectively as P. alni subsp. multiformis. The properties of the Dutch, German and UK variants within subsp. multiformis are informally described. The problems of designating emergent species hybrids under the International Code of Botanical Nomenclature and the reasons for the taxonomic choices made are discussed.

Type
Research Article
Information
Mycological Research , Volume 108 , Issue 10 , October 2004 , pp. 1172 - 1184
Copyright
© The British Mycological Society 2004

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