HISTORICAL 13 



sterigmatic cells taper gradually toward a narrow tube, in which the conidia 

 are consistently elliptical, and in which the maturing cells become en- 

 veloped in slime. No ascosporic stage is known. 



The brown or yellowish group with a conidium-producing tube set at 

 an angle to the principal axis of the sterigmatic cell is separated, following 

 Bainier, as Paecilomyces. The ascosporic stage associated with this type 

 of mold is assignable to Westling's genus Byssochlamys (1909). 



Scopulariopsis of Bainier is accepted for a morphologically consistent 

 series in which the conidia are characterized by a more or less conspicuous 

 basal ring surrounding a germinal pore. Conidial areas are generally in 

 some shade of brown, avellaneous, yellow, or more rarely cream or white, 

 but 7iever green. Conidia are borne upon long narrowly tapering sterig- 

 mata in more or less penicillate aggregates. Perithecia when present are 

 black walled, ostiolate, and do not resemble those of known Penicillia; 

 they are assignable to Zukal's genus Microascus (1885). 



Close genetic relationship of these genera to PeniciUium, particularly 

 Paecilomyces and Scopulariopsis, is not assumed. Nevertheless, since 

 they do produce conidial structures more or less penicillate, and since the 

 literature of these forms is inextricably interwoven with that of PeniciUium, 

 we regard some consideration of these genera as mandatory. They are 

 briefly reviewed in a separate chapter following our discussion of the differ- 

 ent sections of the genus PeniciUium (see Chapter XV). 



