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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...
The 18S rDNA data.base for mainstream Peronosporomycetes has been substantially increased. The sub-class divide between the Peronosporomycetidae and the Saprolegniomycetidae is supported. The deep clade separation of the Leptomitales within the Peronosporomycetidae is reinforced and support is provided for divergences within the Phytophthora and Pythium lines. A new family for the Leptolegnia lineage...