ASPERGILLACEAE 



615 



[ 



usually characteristic for species groups. In the biverticillate series, the 

 phialide is proportionally smaller in diameter and longer, narrowing more 

 slowly at the apex to a much smaller tube (perhaps one-third the diameter 

 of the phialide). In Paecilomyces, the phialide consists of a broad, short basal 

 tube narrowed to a long neck which is bent at its base from the main axis of the 

 phialide (Fig. 98, C). In ScopuJariopsis, the characteristic form of the phialide 

 is lost and the cell tapers from its base to the diameter of the newly formed 

 conidium at its apex (Fig. 93, J). The conidia are cylindric at first and in 

 many species are slow in attaining their spherical or ellipsoid form. In Glio- 

 cladinm, the general branching and shape of the phialides closely resemble that 

 of Penicillium, but the spore chain is surrounded by a film of mucilage and rolls 



Fig. 94. — Conidial stages. 1, Penicillium Caniemberti; Z, P. caseicolum. (After Thorn 1930.) 



up into a ball. Eventually all trace of the chain is lost and conditions are those 

 suggestive of Ceplialosporium (Fig. 95). 



In Penicillium " glaucum," Gueguen (1899) reports the mycelium and 

 penicillus multinucleate, the phialide typically binucleate, one nucleus remain- 

 ing in the center of the cell and the other near its tip, while the conidia are 

 uniformly uninucleate. 



In PenicUlixim Bref eldianum (B. 0. Dodge 1933), a saprophyte from the 

 human alimentary tract, an erect hypha produces long branches, in one of the 

 lower forks of which a coiled mass of hyphae develops the primordium of the 

 perithecium, suggesting a small sclerotium. The sterile surrounding hyphae 

 resemble the pseudoperithecium of the Gymnoascaceae. In this species it is 



