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Revision of Aplanopsis, Pythiopsis, and ‘subcentric’ Achlya species (Saprolegniaceae) using 18S rDNA and morphological data

Published online by Cambridge University Press:  19 August 2002

Mark A. SPENCER ,
Mary C. VICK  and
Michael W. DICK
Mark A. SPENCER
Affiliation:
Centre for Plant Diversity and Systematics, Department of Botany, School of Plant Sciences, University of Reading, Whiteknights, Reading RG6 6AU, UK.
Mary C. VICK
Affiliation:
Centre for Plant Diversity and Systematics, Department of Botany, School of Plant Sciences, University of Reading, Whiteknights, Reading RG6 6AU, UK.
Michael W. DICK
Affiliation:
Centre for Plant Diversity and Systematics, Department of Botany, School of Plant Sciences, University of Reading, Whiteknights, Reading RG6 6AU, UK.
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Abstract

Analysis of 18S rDNA sequence and morphological data indicate that Achlya s. lat. is polyphyletic. Aplanopsis spinosa and Achlya species with subcentric oospores and laterally applied antheridia are transferred to Newbya gen. nov. The relationship of Calyptralegnia and Aplanes androgynus to Newbya is discussed. Molecular data support morphologically based conclusions concerning the relatedness of Pythiopsis and Aplanopsis terrestris. Achlya truncatiformis nom. nov., is provided for material previously identified as Achlya recurva. The following new combinations within Newbya are made: N. pascuicola (type species), N. apiculata, N. braziliensis, N. curvicollis, N. megasperma, N. oblongata, N. oblongata var. gigantica, N. oligacantha, N. polyandra, N. recurva, N. spinosa, and N. stellata combs nov.

Type
Research Article
Information
Mycological Research , Volume 106 , Issue 5 , May 2002 , pp. 549 - 560
Copyright
© The British Mycological Society 2002

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