Return to index


These are organisms that have not sporulated under the culture conditions provided. Most never sporulate in culture (sterile mycelia). Some represent non-sporulating colonies of common fungi (e.g., Cladosporium, Alternaria, even Aspergillus).
Distribution Where Found Mode of Dissemination
Ubiquitous. See "Other Comments." See "Other Comments."
Allergen Potential Opportunist or Pathogen Potential Toxin Production
See "Other comments." Not applicable. Not applicable.
Growth Indoors Industrial Uses Other Comments
Growth on a variety of substrates. Identification is not possible without sporulation. Not applicable. Potentially, all fungi are capable of producing a non-sporulating state.
Characteristics: Growth/Culture Notes on Spore Trap Recognition Notes on Tape Lift Recognition
Many fungi do not adapt well to routine mycologic media and growth conditions and therefore, may not sporulate. Specialized media, light-dark cycles, UV light, and low or high temperatures may be required to stimulate sporulation. Unless distinctive spore types are formed, identification may not be possible. Frequently non-sporulating colonies are produced by basidiomycetes (mushrooms) which usually do not produce fruiting structures on lab media. They may produce clamp connections and/or arthroconidia within their mycelia. Hyphal fragments are not routinely counted or reported. If numbers are excessive a comment indicating high numbers of hyphal fragments will appear on the report. Non-sporulating mycelia may appear as colorless or pigmented (brown), septate (with cross-walls) or non-septate. Further identification requires sporulation.
Definitions | References | Commentary