Trichosporon fungus. Hand drawn illustration showing septate hyphae, pseudohyphae, blastoconidia (singly or in short chains) and arthroconidia. Trichosporon is a microscopic fungus isolated from soil, water, vegetables, mammals, and birds. It is also a part of the normal flora of mouth, skin and nails and is the causative agent of white piedra, superficial infections and invasive trichosporonosis in humans.