Exobasidium cordilleranum Savile
no common name
Exobasidiaceae
Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.
Introduction to the Macrofungi
no common name
Exobasidiaceae
Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.
Introduction to the Macrofungi
Photograph
Map
Distribution of Exobasidium cordilleranum
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Species Information
Summary:
Savile (1959) differentiated this species primarily microscopically from Exobasidium vaccinii and Exobasidium vaccinii-uliginosi. Spore size, basidium size, and the number of sterigmata per basidium are more or less intermediate between those two species as Savile described them. Spore shape is clavate (nearly cylindric in E. vaccinii, broadly clavate to elliptic in E. vaccinii-uliginosi). "The habit, the frequently septate spores, and the production of conidia separate it sharply from [E. vaccinii-uliginosi]." A variety minor is also described which differs in spores and basidia. "This variety approaches E. vaccinii in spore size, but the clavate spores and the preponderance of basidia with three sterigmata indicate its affinity with E. cordilleranum" (Savile, Latin names italicized).
Microscopic:
spores 14.0-19.0 x 3.5-6.3(7.0) microns, clavate, 0-1(3) septate, hilum hooked; basidia 2-3(4)-spored, extending (14)19-31 microns beyond the cuticle, 3.5-7.5 microns wide, sterigmata 4.5-6.0 x 1.3-1.8 microns; conidia 3.5-10.0(14.0) x 0.8-2.0 microns, acicular, (Savile), spores (11.0)13.0-16.5 x 3.0-4.5 microns, 0-1-septate; basidia 4.0-6.3 microns wide, extending about 20 microns beyond the cuticle, (Savile for var. minor)
Notes:
Collections were examined from BC (both varieties) and from the Idaho-Montana border (var. minor), (Savile).
Habitat and Range
SIMILAR SPECIES
See also SIMILAR section of Exobasidium vaccinii and Exobasidium vaccinii-uliginosi.Habitat
on leaves of Vaccinium parvifolium (type) and Vaccinium ovalifolium "The spores tend to be slightly smaller on V. ovalifolium than on V. parvifolium, but from the available series it is uncertain whether the difference is real. Four-spored basidia also seem to be commoner on V. ovalifolium than on the type host." (Savile)