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Pichia insulana sp. nov., a cactophilic yeast from the Caribbean

¹ Tennessee State University;
² University of Perugia;
³ University of California Davis

⁴ E-mail: pganter{at}tnstate.edu

A new species of ascomycetous yeast, Pichia insulana sp. nov., is described from the necrotic tissue of columnar cacti on Caribbean islands. P. insulana is closely related to and phenotypically very similar to P. cactophila and P. pseudocactophila. There are few distinctions between these taxa beside spore type, host preference and locality. Sporogenous strains of P. insulana that produce asci with 4 hat-shaped spores have been found only on Curaçao, whereas there was no evidence of sporogenous P. cactophila from that island. In addition, sequences of the D1/D2 fragment of the LSU rDNA gene from 12 Curaçao strains showed consistent differences with the sequences of the P. cactophila and P. pseudocactophila type strains. The type strain of P. insulana is TSU00-106.5 (= CBS 11169, = UCD-FST 09-160)