Mycoscience (2003) 44, 1-9

H. Nagao, M. Akimoto, K. Kishi, A. Ezuka and M. Kakishima (2003)
Exobasidium dubium and E. miyabei sp. nov. causing Exobasidium leaf blisters on Rhododendron spp. in Japan
Mycoscience 44 (1), 1-9
Abstract: Two Exobasidium species causing Exobasidium leaf blister on Rhododendron spp. are described. An Exobasidium leaf blister on Rhododendron yedoense var. yedoense f. yedoense has been recognized in Hokkaido Prefecture, Japan, since the first report was issued in 1950. The causal fungus is identified with Exobasidium dubium from the morphology of its hymenial structure and mode of germination of the basidiospores. Another Exobasidium leaf blister on Rhododendron dauricum has been observed in Hokkaido Prefecture, Japan. In comparison with morphology based on hymenial structure and mode of germination of the basidiospores of the 100 validly described taxa, this fungus differs from those known taxa in the size of basidia and basidiospores, the numbers of sterigmata and septa of basidiospores, and the mode of germination of basidiospores. Thus, a new species, Exobasidium miyabei, is established and illustrated.
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Database assignments for author(s): Makoto Kakishima

Research topic(s) for pests/diseases/weeds:
identification/taxonomy
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Exobasidium dubium	Rhododendron (crop)	Japan
	Exobasidium miyabei	Rhododendron (crop)	Japan