Penicillium and Related Genera
Grouped in this chapter are genera which produce conidia in a structure termed a penicillus (Latin, little brush). A penicillus consists essentially of a well-defined cluster of phialides or similar cells bearing small, single-celled, dry conidia in chains. The phialides are either attached to a stipe directly or through one or more stages of branching. Branches are of generally similar diameter to stipes (Fig. 7.1).