Basidiomycota, Pucciniomycotina, Sporidiobolales, Sporidiobolaceae. Genus: RHODOSPORIDIOBOLUS
Rhodosporidiobolus fluvialis (Fell et al.) Wang et al.
Colony characteristics
Colonies (MEA, 3 d, 25°C) light orange, smooth, glistening, slightly raised; margin entire. On CMA after 6 days, fimbriate patches may be formed consisting of hyphae with teliospores.
Microscopy
Budding cells ovoidal to spheroidal, 5.5-9.5(-10.5) × 3.5-8.0 µm, singly or in pairs. Homothallic. Hyphae with incomplete, occasionally complete clamps at the septa. Teliospores intercalary, rarely terminally or on short branches, with a clamp at the base, (sub)spherical, 8.5-12.0 × 7.5-10.5 µm, usually single, sometimes in pairs, in one-month-old cultures in larger groups, smooth-walled, becoming warted with age.
Pathogenicity
RG-1, BSL-1. Lipid-producing environmental yeast (Poontawee & Limtong, 2020). Huang et al. (2024) mentioned cases of fungemia and pulmonary infection in severely compromised patients.
Nomenclature
Rhodosporidium fluviale Fell, Kurtzman, Tallman & J.D. Buck – Mycologia 80: 562, 1988 ≡ Rhodosporidiobolus fluvialis (Fell, Kurtzman, Tallman & J.D. Buck) Q.M. Wang, F.Y. Bai, M. Groenewald & Boekhout – Stud. Mycol. 81: 181, 2015; type strain: CBS 6568 = IAM 14170 = IGC 4701 = JCM 10311 = NRRL Y-12922 = PYCC 4701.
