, Volume 84, Issue 2–3, pp 121–131 | Cite as

Biochemical variation of Cryptococcus neoformans

  • Kathryn A. Schmeding
  • Shung C. Jong
  • Rudolph Hugh


Ninety-seven strains of Cryptococcus neoformans and C. bacillisporus were examined for 44 biochemical characters and the results were analyzed numerically. One phenon emerged at the 86% level of similarity when strains were clustered according to their M-similarity values. All strains grew in ten carbon sources (D-glucose, D-galactose, arbutin, maltose, sucrose, D-melezitose, D-xylose, D-mannitol, D-glucitol, and meso-inositol), and also grew at 37 ° C and produced urease and phenoloxidase. None of them grew in melibiose, lactose, nor valine, and none reduced nitrate to nitrite. Comparison of selected biochemical characters, creatinine utilization, and serotypes of 49 aberrant strains is presented. Forty-eight of the 97 strains produced the Filobasidiella state either alone or when paired with a strain of compatible mating-type. Filobasidiella neoformans serotypes A and D were interfertile with compatible mating-types of F. bacillispora serotypes B and C. The 44 biochemical characters and 4 serotypes did not predict barriers to mating competence. The present study further substantiates that Filobasidiella neoformans and F. bacillispora are one species.


Nitrite Lactose Maltose Cryptococcus Neoformans Arbutin 
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Copyright information

© Dr W. Junk Publishers 1984

Authors and Affiliations

  • Kathryn A. Schmeding
    • 1
  • Shung C. Jong
    • 1
  • Rudolph Hugh
    • 2
  1. 1.Mycology DepartmentAmerican Type Culture CollectionRockvilleUSA
  2. 2.Department of MicrobiologyGeorge Washington University School of MedicineWashington, D.C.USA

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