Journal
PHYTOTAXA
Volume 422, Issue 3, Pages 209-224Publisher
MAGNOLIA PRESS
DOI: 10.11646/phytotaxa.422.3.1
Keywords
biotrophs; molecular phylogeny; Rosaceae; taxonomy; Xylariomycetidae
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Funding
- Thailand Research grant entitled the future of specialist fungi in a changing climate: baseline data for generalist and specialist fungi associated with ants, Rhododendron species and Dracaena species [DBG6080013]
- Thailand Research grant entitled the Impact of climate change on fungal diversity and biogeography in the Greater Mekong Subregion [RDG6130001]
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Collections of eleven Prunus specimens infected with Polystigma species from Belarus and Russia yielded two existing taxa: Polystigma fulvum (sexual moipli) and Polystigma rubrum (asexual morph). DNA based phylogenies of large subunit nuclear rDNA (LSU) and nuclear ribosomal internal transcribed spacer (ITS) are provided for the first time for Polystigma fulvum and its placement is confirmed within Polystigmataceae. The concatenated LSU and ITS DNA sequence data for P. rubrum, analyzed to infer its potential relationship to other Polystigma species, also show that strains of P. rubrum are segregated into two subclades with sufficient genetic differences. No significant differences in morphology or morphometry among the strains of P. rubrum between the two subclades, especially vis-a-vis the conidiogenous cell and conidium sizes are observed (P>0.05). Subspecies concept of P. rubrum complex is discussed.
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