I am studying a Penicillium from indoor environment (probably a common species) which is greenish with dull hue but often turns veige or light brown with age (or high room temp ?) on PDA. On Yeast Mould Agar (I start loving this medium!) they are always with a beige hue. It often forms concentric growth rings.
first of all, I am not sure if I have a pure colony or not. In one of the plates, it seems there are two types of Penicillia!
The one with broad Metullae is much more prevalent and is the one I am studying.
The colonies appear to be homogenous and consist of one species only. I am thinking we are around P. digitatum or P. italicum or P. expansum... but more research is required. Any comments are welcome.