ABSTRACT
The genus Paecilomyces was rstly introduced by Bainier [1] as being closely related to Penicillium Link ex Fr. with differences in the color of colonies and shape of phialides. Subsequently, the genus was studied by Hughes [2], Brown and Smith [3], Morris [4], Onions and Barron [5], and de Hoog [6]. In 1974, Samson [7] monographed and redened this genus. Based on morphological characters in pure culture, he discussed the delimitation of the genus and the relationships to other genera and proposed a subdivision into two sections: Section Paecilomyces (mesophilic to thermophilic species with yellow-brown to brown colonies) and Section Isarioidea (mesophilic species with white or other bright colonies that included several entomopathogenic or nematophagous species). Additionally, it was afrmed that the known perfect states belong to the Ascomycetes, Byssochlamys Westl., Talaromyces C.R. Benjamin, and Thermoascus Miehe.
