Fungus
Trichosporon species
Arthroconidia-forming yeast; white piedra
trik-oh-SPOR-on
High-yield clue
Arthroconidia-forming yeast causing soft hair-shaft nodules (white piedra), plus a false-positive cryptococcal antigen in disseminated disease, is the core study clue.
Overview
Yeast-like fungi (notably Trichosporon asahii) that form true hyphae and arthroconidia; they cause superficial white piedra of hair and disseminated trichosporonosis in neutropenic hosts. Classic arthroconidia-forming yeast teaching organism.
Classification
- Yeast-like fungus
- Basidiomycota
- Produces true hyphae, pseudohyphae, and arthroconidia
- Blastoconidia present
- Environmental and skin-associated
Lab & identification clues
- Hyaline arthroconidia (segmenting hyphae) microscopy vocabulary
- Soft light nodules on hair shafts in white piedra
- Cross-reacts with cryptococcal antigen test vocabulary
- Growth as urease-positive yeast in coursework
Associations
- White piedra of scalp, beard, or body hair vocabulary
- Disseminated trichosporonosis in neutropenic/hematologic patients
- Bloodstream and catheter-related infection vocabulary
- Summer-type hypersensitivity pneumonitis association
Commonly confused with
- Cryptococcus (shared antigen cross-reaction)
- Geotrichum (arthroconidia-forming look-alike)
Frequently asked questions
What is Trichosporon species?
Yeast-like fungi (notably Trichosporon asahii) that form true hyphae and arthroconidia; they cause superficial white piedra of hair and disseminated trichosporonosis in neutropenic hosts. Classic arthroconidia-forming yeast teaching organism.
What are the lab clues for Trichosporon species?
Lab clues for Trichosporon species include Hyaline arthroconidia (segmenting hyphae) microscopy vocabulary, Soft light nodules on hair shafts in white piedra, Cross-reacts with cryptococcal antigen test vocabulary, and Growth as urease-positive yeast in coursework.
What is Trichosporon species commonly confused with?
Trichosporon species is commonly confused with Cryptococcus (shared antigen cross-reaction) and Geotrichum (arthroconidia-forming look-alike).
Original student-study summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment, dosing, or specimen-handling guidance.