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Drechslera, Bipolaris, and Exserohilum group

Mitosporic fungi. Hyphomycetes. Teleomorphs (sexual state): Pyrenophora, Cochliobolus, Setosphaeria (Ascomycetes).
Distribution Where Found Mode of Dissemination
Ubiquitous;
cosmopolitan.
Some species are more commonly found in tropical or subtropical areas.
Drechslera: Approx. 20 species.
Bipolaris: Approx. 20 species.
Exserohilum: Approx. 8 species.
Plant debris, soil. Plant pathogens of numerous plants, particularly grasses. Dry spore.
Wind.
Allergen Potential Opportunist or Pathogen Potential Toxin Production
Common.
Type I allergies (hay fever, asthma).
Other: Most commonly reported cause of allergic fungal sinusitis.
Occasionally a cause of phaeohyphomycosis, including keratitis, sinusitis, and osteomyelitis. These infections most often occur in immunocompromised persons, although infections also occur in normal hosts. One case of brain abscess reported in an immunocompromised patient. Not known.
Growth Indoors Industrial Uses Other Comments
Yes, on a variety of substrates. Not known. None.
Characteristics: Growth/Culture Notes on Spore Trap Recognition Notes on Tape Lift Recognition
Grows well on general fungal media although many isolates need "light/dark cycling" for sporulation. Colonies are shades of dark gray to brown. Group includes Drechslera, Bipolaris, Exserohilum and the rare Helminthosporium. Members of this group can best be differentiated in culture. This group is readily identifiable on tape lifts.
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