Colonies on Chapek's agar on the 14th day they reach a diameter of 3-6 cm, velvety or powdery, abundantly sporiferous in gray-blue-green, blue-green, in the central part - brown-gray tones, with a white webbed edge. Exudate droplets are yellow to yellow-orange. Reverse orange, brown, purple-brown, yellow, pinkish-orange, on the edge with a greenish tinge. The pigment released on Wednesday is orange-yellow, brick-red, pink, yellow-green. On CYA, the colonies are velvety, abundantly sportive in dark gray-green, dark green, gray-blue-green tones, sometimes with colorless, yellow or amber-brown exudate. The reverse is orange, yellow-orange, orange-brown, along the edge - more yellowish, greenish, grayish. The pigment is usually released on Wednesday - golden yellow or yellow-brown. On malt extract agar (MEA), colonies are sparsely growing, with an irregular-toothed margin, abundantly sporiferous over the entire surface in gray tones, with a dark reddish-brown reverse and red-brown pigment released on Wednesday.
Conidiophores single and bunk, often incorrectly branched. Metulas in whorls of 2-5, often unequal, rough. Phialides in verticils 5-8, flasklike, 5.6-8 × 1.9-2.5 microns. Conidia spherical, prickly, 2.8-3.8 microns in diameter.
Differences from related species
It is determined by velvety or granular colonies with dark-blue-green or brown-gray sporulation, orange-brown reversal and soluble pigment, single-tier and two-tier brushes with prickly conidia.
Spiny conidia approaching Penicillium janczewskii from the Canescentia section; however, in that type of pigmentation is less intense, conidiophores are predominantly bunk, gray sporing in gray tones, legs of conidiophores are smooth.