Differentiation of Species of Taphrina in Culture. Utilization of Nitrogen Compounds

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Abstract
SUMMARY Fifty-seven host-forms, representing twenty-seven species of Taphrina, and thirteen asporogenous yeasts were grown in liquid media with different sources of nitrogen as follows: eight ammonium compounds, four nitrates, urea, peptone, asparagine, and seventeen amino acids. Ammonium chloride was refused by Taphrina americana and by T. caerulescens from Quercus macrocarpa and Q. prinoides. Ammonium nitrates was refused by Taphrina nana, T. ulmi from Ulmus rubra, Candida pseudotropicalis var. lactose and by Torulopsis sphaerica. Urea and asparagine were used by all the fungi studied. Peptone was refused only by Taphrina americana. All non-sporulating yeasts but Torulopsis dattila used ammonium acetate; none of the species of Taphrina studied used this compound. All species of Taphrina showed a characteristic pattern of nitrogen utilization. Some host-forms within species agreed closely in behavior while others showed various degrees of difference. None of the fungi studied required the addition of thiamine to the media used, though in general they made better growth with added thiamine. Most of the asporogenous yeasts were omnivorous or nearly so with regard to the compounds offered them. Torulopsis dattila and Candida pseudotropicalis var. lactosa were highly selective. It seems possible to differentiate species of Taphrina in culture on the basis of their use or refusal of different compounds of nitrogen.

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