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Ceratocystis/Ophiostoma group

Ascomycetes with multiple asexual forms: Graphium, Leptographium, Sporothrix-like anamorphs, Chalara.

Ceratocystis Ophiostoma microphoto



Approx. 56 species, both genera.

Where Found

Commercial lumber, tree and plant pathogen.

Mode of Dissemination

Wet spore.

Growth Indoors

Most homes built with lumber have areas of growth on wood framing inside walls.

Industrial Uses

None known.

Other Comments

Ophiostoma ulmi is the cause of Dutch Elm Disease.

Potential Health Effects


Not studied.
Persons most likely to be affected would be lumber-yard workers or carpenters.

Potential Opportunist or Pathogen

Not reported to infect humans or animals. A connection between Ophiostoma and the human pathogen Sporothrix schenckii has been proposed but not confirmed.

Potential Toxin Production

None listed.

Laboratory Notes

Growth/Culture Characterisics

Some species may grow on specialized laboratory media. Asexual forms grow on general fungal media.

Spore Trap Recognition

Not identifiable on spore trap slides. On rare occasions the spores of Gonatobotryum, which grows parasitically on Ceratocystis, are seen on spore trap samples (an indirect indication of the presence of this group of fungi).

Tape Lift Recognition

Distinctive fruiting bodies with long necks are identifiable on tape lifts.