Colonies on Chapek's agar sparingly growing, in the central part cerebrally folded, in the rest - radially folded, white, pale yellow or greenish-yellow, slightly sporiferous. Sporulation in gray-green tones, sometimes concentrated in the marginal zone. The reverse is bright yellow to yellow-orange, often rich in yellow soluble pigment. Exudate abundant, yellow. On CYA, colonies reach a diameter of 2-3 cm in 7 days, velvety, with a white or light yellow mycelium. Sporulation usually mild, rarely abundant. Exudate is absent or not abundant, sometimes yellow soluble pigment is released. The reverse is beige to beige-brown, sometimes yellow-orange. On malt extract agar (MEA), sporulation of varying intensity.
On oatmeal agar (OA) it forms light orange to orange-brown sclerotia 125–250 μm in diameter, covered with abundant exudate.
Conidiophores 200-400 microns long, two-tier, with symmetrically arranged metulas, sometimes with an additional sprig, smooth-walled, 2.5-4 microns thick. Metules in verticils of 3-6, often unequal, 10-12 microns in length. Flialoid phialides, 7–9 µm long and 2–3 µm thick. Conidia are almost spherical to wide-ellipsoidal, 2–3 × 2–2.5 µm.
Differences from related species
Michitsinsky's penicillus does not grow at 30 ° C or higher. Forms a limited growing colonies with orange sclerotia. The diameter of the colonies on CYAS is less than on CYA.
The closest species are Penicillium neomiczynskii , Penicillium cairnsense , Penicillium aurantiacobrunneum (not different in ITS), Penicillium quebecense . Differs from P. cairnsense and P. quebecense in more limited growth on most media, as well as the absence of red soluble pigment on CYA. From P. neomiczynskii and P. aurantiacobrunneum, it differs by slow growth on CYAS (CYA with 5% NaCl). P. neomiczynskii has been described from soil in New Zealand. P. aurantiacobrunneum appears to be ubiquitous: isolated from soil in Chile and New Zealand and from the air in Denmark.
A ubiquitous soil fungus, occasionally released as a pollutant from a wide variety of substrates.
Producer of citreoviridine and cyclopiazonic acid .
Named after the Polish botanist and geneticist Kazimierz Michinsky (1868-1918).
Penicillium miczynskii K.Zaleski , 482 (1927).