[3] When grown in pure culture on agar plates, A. sydowii produces blue-green colonies with reddish-brown shades.

[4] Aspergillus sydowii is a saprophytic fungus found in soil that can contaminate food and is occasionally pathogenic to humans.

It is the predominant fungus found on wheat Qu, the most widely used source of raw microorganisms and crude enzymes for Chinese rice wine brewing.

A more likely vector seems to be the flamingo tongue snail (Cyphoma gibbosum), a specialist predator on sea fans, and the fungus has been found in its faeces.

[7] Other bioactive compounds known to be unique to this fungus include aspergillusenes A and B, (+)-(7S)-7-O-methylsydonic acid, and hydrogenated xanthone derivatives aspergillusones A and B.