Capronia mansonii  Capronia mansonii is a mesophilic black yeast that is a part of the Herpotrichiellaceae. The species is uncommon in nature but is saprotrophic in nature and been discovered on decaying plant matter, particularly wood. This fungus is naturally found in the Netherlands and has successfully been cultured in lab. It is a teleomorph of the ascomycota division and possesses brown spores. "Capronia mansonii" is a type of black yeast that was first discovered from an isolated strain in 1968. The fungus was originally described from a strain in vitro found in Norway by Schol-Schwarz on an aspen tree, and it has not yet been described in situ. This fungus was the first species in Herpotrichiellaceae discovered to create ascomata in an isolated culture. It is one of the only five species out of thirty "Capronia" species that has successfully produced ascomata in vitro. The basionym for this species is "Dictyotrichiella mansonii". Its anamorph is thought to be "Exophiala mansonii" but uncertainty and discourse remains. The original anamorph was first thought to be " Rhinocladiella atrovirens" and then "Exophiala castellanii" An analysis of rRNA gene sequences concluded that "C. mansonii" is the same biological species as "E. castellanii". "Capronia mansonii" is often misidentified as its sister species "Capronia munkii" but can be differentiated by its larger and thicker cell walls and more frequent ascospores that transversely septate. It is also differentiated from its anamorph because it lacks conidia, slimy colonies, and aerial hyphae. This fungus is a teleomorph or sexual form that is formed in vitro. This species has yet to be described in situ. The fungus is thought to be closely related to "Exophiala dermatitidis", and is often hypothesized in literature to be the teleomorph of "E. dermatitidis". The fungus is a part of the ascomycota phylum, also commonly defined as sac fungi. This phylum is often defined by its possession of asci, a microscope sexual structure that produces non-motile spores called ascospores. The asci of C. mansonii produce 8 ascospores upon germination. These ascospores begin with a glassy transparent appearance and then progress to a more grey-yellow, olive, and finally brown colour.