Fruiting structure a synnema, composed of fused dark conidiophores terminating in a droplet of liquid containing conidia. The colourless 1-celled spores are produced continuously from annellides, phialides or sympodially occurrring holoblastic loci, and collect in a large drop of fluid. The synnemata can be quite stout and up to 5 mm high.
The two photographs above were taken from a culture isolated from seeds of canola, an edible rapeseed. It is a typical Graphium anamorph of Kernia, Microascus, Petriella and Pseudallescheria, all members of the ascomycete family Microascaceae. A few non-synnematous (mononematous) structures can be seen in the photograph at left; strictly speaking, these should be called Scedosporium because they are not synnematous. However, many strains are highly synnematous when first isolated but become mononematous after a few transfers. Some species of Scedosporium cause disease in humans and should be handled with great care. The drawing at right was made from an isolate of Ophiostoma and represents a typical Graphium anamorph of the family Ophiostomataceae.
Occurring on wood, dung, seeds, and plant debris. Holomorphs: Ceratocystis, Chaetosphaeria, Kernia, Microascus, Ophiostoma, Petriella, Pseudallescheria. Ref: Ellis 1971; Seifert and Okada, 1993.