Five New Basidioblastomycetous Yeast Species Segregated from Cryptococcus vishniacii emend. auct., an Antarctic Yeast Species Comprising Four New Varieties

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Abstract
The C. vishniacii complex, consists of 7 spp. possessing less than 52% (DNA)-DNA homology: C. lupi, C. vishniacii, and 5 new species. C. vishniacii Vishniac and Hempfling emend. auct. (additional characters include assimilation of L-aspartate, L-glutamate, 2-ketogluconate, and succinate) includes C. vishniacii var. vishniacii var. nov. (MYSW 304Y268 = ATCC 36649) assimilating (besides substrates common to the species) L-arabinose, citrate, L-proline (weakly), sucrose, raffinose and L-rhamnose (weakly); C. vishniacii var. wolfi var. nov. (MYSW 3034216 = ATCC 46404), differing from C. vishniacii var. vishniacii in assimilating fumarate and L-malate but not L-arabinose, citrate, sucrose, and raffinose; C. vishniacii var. asocialis var. nov (MYSW 302Y312 = ATCC 46402), differing from C. vishniacii var. vishniacii in assimilating fumarate and L-malate but not L-arabinose or citrate; and C. vishniacii var. vladimiri var. nov. (MYSW 302Y265= ATCC 46403) differing from C. vishniacii var. vishniacii in assimilating cellobiose, methyl-.alpha.-D-glucoside, and salicin but not L-proline or L-rhamnose. C. asgardensis sp. nov. (MYSW 302Y310 = ATCC 46399) differs from C. vishniacii in being suppressed by 0.05 .mu.g of cycloheximide ml-1 and differs from all other described yeasts in that it produces cream-colored colonies, utilizes NO3--N, and assimilates L-arabinose, cellobiose, melezitose and L-rhamnose but not D-galactose, myo-inositol, or D-mannitol. C. baldrensis sp. nov. (MYSW 302Y259 = ATCC 46400) differs from all other described yeasts in that it produces cream-colored colonies, utilizes NO3--N, and assimilates L-arabinose, cellobiose, 2-ketogluconate and melezitose but not D-mannitol or succinate. C. hempflingii sp. nov. (MYSW 306Y212 = ATCC 46401) differs from all other described yeasts in that it utilizes NO3--N and assimilates melezitose and D-xylose but not D-mannitol, salicin or succinate. C. tyrolensis sp. nov. (MYSW 303Y336 = ATCC 46405) differs from all other described yeasts in that it produces cream-colored colonies, utilizes NO3--N, and assimilates L-arabinose, melezitose, salicin and D-xylose but not cellobiose or D-mannitol. C. wrightensis sp. nov. (MYSW 303Y206 = ATCC 46406) differs from all other described yeasts (except C. vishniacii) in producing cream colonies and in utilizing NO3--N and assimilating cellobiose, citrate and melezitose but not L-arabinose, glycerol, or D-mannitol. C. wrightensis is phenotypically most similar to C. vishniacii var. vladimiri, differing from it by assimilating fumarate (weakly) and L-malate but not L-arabinose. Keys for yeast identification should include varietal listings.