TABLE 2.
Morphological and physiological key characters for differentiating among species of the Pseudallescheria/Scedosporium complex and S. prolificansa
| Species | Conidiogenous cells | Sessile conidia | Colony reverse in orange shadesb | Yellow diffusible pigmentb | Assimilation of:
|
Growth at:
|
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ribitol | l-Arabinitol | Sucrose | Maltose | d-Ribose | 40°C | 45°C | |||||
| P. boydii and relativesc (clade 5) | Cylindrical | Globose to subglobose, thick-walled | − | V | + | + | + | + | + | + | − |
| P. minutispora (clade 2) | Cylindrical | Ellipsoidal to obovoid, thin-walled | − | − | + | + | + | − | − | + | − |
| S. apiospermum (clade 4) | Cylindrical | Globose to subglobose, thick-walled | − | V | + | + | + | + | − | + | − |
| S. aurantiacum (clade 1) | Cylindrical or slightly flask-shaped | Mostly obovoid, thick-walled | + | + | + | + | − | + | + | + | + |
| S. dehoogii (clade 3) | Cylindrical or slightly flask-shaped | Mostly obovoid, thin-walled | − | − | + | + | + | + | − | − | − |
| S. prolificans | Flask-shaped | Globose to subglobose, thick-walled | − | − | − | − | − | + | − | + | V |
a
Abbreviations and symbols: −, all strains of the species displayed a negative response; +, all strains of the species displayed a positive response; V, variable (i.e., some strains were positive and others were negative).
b
That is, on PDA at 25°C.
c
That is, P. angusta, P. ellipsoidea, and P. fusoidea. These species can be identified by other molecular and morphological characteristics.