(Jorgensen) FC Harrison (1928)
Colonies on Sabouraud dextrose agar at 25°C are orange to pink to coral and are smooth to rugoid and dull to glistening.
On cornmeal following 72 hours incubation at 25°C, only globose yeast cells are produced (2.5-10 µm in diameter) .
This isolate is urease positive, nitrate negative and has negative growth on cycloheximide or at 40°C. This isolate has been reported as perhaps the only isolate to cause human infection . Reports in the literature include aortic homograft endocarditis  while FTL cultures have been recovered from blood. This species was incorrectly renamed to Rhodotorula rubra but this is not a valid species and the name reverted to R. mucilaginosa .
FTL* in vitro susceptibility data
|0.125 µg/ml=1||8.0 µg/ml=7||>64 µg/ml=11||4.0 µg/ml=1||4.0 µg/ml=2||0.5 µg/ml=3||0.25 µg/ml=1|
|0.25 µg/ml=7||>8.0 µg/ml=1||8.0 µg/ml=5||8.0 µg/ml=6||1.0 µg/ml=5||0.5 µg/ml=1|
|0.5 µg/ml=4||>8.0 µg/ml=1||>8.0 µg/ml=1||2.0 µg/ml=1|
* Fungus Testing Laboratory unpublished data (CLSI M27-A2)