Colonies on CYA on the 7th day, 2-3.5 cm in diameter, depressed in the central part, with white, yellow and red mycelium, with abundant sporulation in olive-green or gray-green tones. On Wednesday, an abundant red pigment is released. Exudate is absent. The reverse is brownish red.
On malt extract agar (MEA), colonies with white and yellow mycelium, in the center are slightly raised and depressed, velvety. Sporulation is plentiful, gray-green. Reverse in the center to dark brown, closer to the edge brown-red, sometimes gray-yellow or gray-orange. Soluble pigment is not released into the medium.
On agar with yeast extract and sucrose (YES), the colonies in the center are elongated, with white mycelium, usually velvety, with abundant gray-green sporulation. Soluble pigment is not allocated, the reverse of the colonies is gray-brown, brown, closer to the edge - orange, light brown.
Conidiophores are two-tiered brushes with a smooth-walled pedicle 100-250 microns long and 2.5-3 microns thick. Metulae in whorls of 3-5, 7-12 microns in length. Needle -shaped phialides, 3–6 in a bundle, 9–12 × 2–2.5 μm. Conidia are ellipsoidal, smooth-walled, 2.5-3.5 × 1.5-2 microns.
Differences from close species
It differs from other species, including Talaromyces purpurogenus , in its rapid growth on standard media and the reddish reverse and velvety texture of the colonies on MEA.
Mostly soil fungus, rarely found as a pollutant on various organic substrates.
Talaromyces ruber ( Stoll ) Yilmaz , Houbraken , Frisvad & Samson , Persoonia 29: 48 (2012). - Penicillium rubrum Stoll , 35 (1904).