Basidiomycota, Agaricomycotina, Trichosporonales, Trichosporonaceae. Genus: TRICHOSPORON
Trichosporon austroamericanum Francisco et al.
Latest update: 29 September 2024
Colony characteristics
Colonies (YPGA, 1 wk, 25°C) with restricted growth, cream to beige, membranous, rough to cerebriform at the centre, somewhat fissured near the margin.
Microscopy
True hyphae abundant, septate every 20-30 μm, 1.0-2.5 μm wide, producing spherical to ellipsoidal conidia measuring 2–4 × 1.5–3.0 μm; hyphae often disarticulating into separate cells. Appressoria absent in slide cultures.
Differential diagnosis
The species is close to T. inkin but differs by growth at 45°C, no growth with succinate and citrate, and no growth in the presence of 50% glucose.
Pathogenicity
RG-1, BSL-1. Fungus repeatedly isolated from clinical specimens and mentioned to cause white piedra on human hair (Francisco et al., 2024), but as yet no case report has been published.
Nomenclature
Trichosporon austroamericanum Francisco, Colombo, Desnos-Ollivier & Hagen, in Francisco, Desnos-Ollivier, Dieleman, Boekhout, Wagner, Medina-Pestana, Colombo & Hagen – Mycopathologia 189 (43): 11, 2024; type strain: CBS 17435 = L9630; ITS rDNA = PP192021; D1/D2 LSU rDNA = PP508390; IGS1 = OM472496.
Antifungal susceptibility
| Antifungal | Range | Strains | Reference | |
| AMB | 1-8 | 7 | Francisco et al. (2024) | |
| FCZ | 2-4 | 7 | Francisco et al. (2024) | |
| ISA | 0.03-0.125 | 7 | Francisco et al. (2024) | |
| PCZ | 0,03-0.25 | 7 | Francisco et al. (2024) | |
| VCZ | 0.03-0.06 | 7 | Francisco et al. (2024) |
