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Exobasidium darwinii, a new Hawaiian species infecting endemic Vaccinium reticulatum in Haleakala National Park

M. Piątek,M. Lutz,Patti Welton

Published 2012 in Mycological progress

ABSTRACT

Hawaii is one of the most isolated archipelagos in the world, situated about 4,000 km from the nearest continent, and never connected with continental land masses. Two Hawaiian endemic blueberries, Vaccinium calycinum and V. reticulatum, are infected by Exobasidium species previously recognized as Exobasidium vaccinii. However, because of the high host-specificity of Exobasidium, it seems unlikely that the species infecting Vaccinium calycinum and V. reticulatum belongs to Exobasidium vaccinii, which in the current circumscription is restricted to Vaccinium vitis-idaea. We collected a fresh specimen of Exobasidium on Vaccinium reticulatum in Haleakala National Park, and analysed it by a combined morphological and molecular approach. The morphological and phylogenetic analyses (based on the LSU and the concatenated ITS+LSU sequence data) showed that Exobasidium on Vaccinium reticulatum belongs to an undescribed species, distinct from Exobasidium vaccinii and any other species. The name Exobasidium darwinii is proposed for this novel taxon. This species is characterized among others by the production of peculiar witches’ brooms with bright red leaves on the infected branches of Vaccinium reticulatum. Relevant characters of Exobasidium darwinii are described and illustrated, additionally phylogenetic relationships of the new species are discussed.

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