Colonies on agar Chapek fast-growing, granular to tufted, abundantly spore-bearing in dull green tones. Exudate in the form of large colorless or beige drops. The reverse is golden yellow, soluble pigment does not stand out in the medium. On CYA, colonies reach a diameter of 2.5-4 cm in 7 days, radially thin-folded, with white mycelium at the edges, moderately abundant and copiously spore-bearing. The exudate is plentiful, colorless or brownish. The reverse is folded, golden yellow. On malt extract agar (MEA), colonies were 2.5-4 cm in diameter on the 7th day, velvety to granular, unpainted to dull yellow. On agar with yeast extract and sucrose (YES), the reverse is golden yellow, colonies on the 7th day are 3.5-5.5 cm in diameter.
At 37 ° C, small colonies form, on CYA on the 7th day they reach 3–9 mm in diameter, very rarely there is no growth.
Conidiophores are three-tiered, 200-400 microns long, smooth-walled, less often rough, with pressed elements. Twigs 15-25 microns long, 12-17 miculas. Phialides are flask-like, narrowed into a short neck, 7–9 microns long. Conidia are widely ellipsoidal, 2.8–3.2 × 3.3–3.8 μm, smooth-walled, chains are assembled into long loose columns.
Differences from close species
From Penicillium chrysogenum it often differs in bundled colonies and the absence of yellow soluble pigment. It differs from Penicillium expansum in its ability to grow at 37 ° C and mild brown pigmentation.
It is found on various fruits of plants and other plant foods. Known from subtropical regions, also found in greenhouses.
Producer of griseofulvin and viridicatum toxin .