Helen Simpson Vishniac

Cryptococcus consortionis is a fungus species. It produces colonies that are cream colored with a glistening, mucoid appearance. When grown in liquid media, this species requires constant agitation. This species growth range is from 4 °C to 23 °C, with growth at 23 °C occurring very slowly. On the microscopic level, C. consortionis appears ovoid, with a thin capsule. Sexual reproduction does not occur in this species, but it asexually reproduces through budding at the birth scar site. Very occasionally, the cells have been observed to produce three celled pseudomycelia. C. consortionis does

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Naganishia vishniacii is an extremophile fungus originally isolated as a yeast from soil samples in the dry valleys of Antarctica. The species grows at 4 degrees Celsius and below but not at 26 degrees Celsius and above. Visually it is characterized as a cream mass in culture. It is nonfermentative and assimilates glucose, maltose, melezitose, trehalose, and xylose. Molecular research, based on cladistic analysis of DNA sequences, shows that the species does not belong in the Cryptococcaceae. A yeast was described as Cryptococcus socialis in a 1985 paper by Helen S. Vishniac, together with C.

Naganishia antarctica is a yeast species that has been isolated from soil in Antarctica. This species grows best between 4 °C (39 °F) and 20 °C (68 °F), and some strains have been observed to grow above 25 °C (77 °F). This temperature range is one of the only things that can distinguish it from N. albida on the DNA level, however, it can be phenotypically differentiated through its ability to utilize different minerals and its overall appearance. When plated the colonies have a slightly mucosoid appearance, with a white to cream coloration. Naganishia antarctica is able to assimilate nitrogen

Naganishia albidosimilis (synonym Cryptococcus albidosimilis) is a species of fungus in the family Filobasidiaceae. It is currently only known from its yeast state, isolated from soil in Antarctica. When plated on agar Naganishia albidosimilis produces colonies that are shining white. The colonies appear to be mucosoid when plated on agar. When grown in liquid media, the yeast fails to grow well unless the media is constantly agitated. This species is considered mesophilic, with optimal growth temperature at 25 °C. The yeast cells are ovoid and produce a capsule. Naganishia albidosimilis

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