| 1 | Intercalary conidia absen | 2 |
| – | Intercalary conidia present, subglobose or ellipsoidal | C.albus |
| 2 | Mostly 1–2 conidia borne on ampulliform swellings | 3 |
| – | Usually only 1 conidia borne on ampulliform swellings | C.peltricolor |
| 3 | Conidia less than 20 μm long | 4 |
| – | Conidia more than 20 μm long | C.serratus |
| 4 | Conidia obovoid or ellipsoidal | C.obovatus |
| – | Conidia subglobose, pyriform or ellipsoid | C.vellereus |
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