AIONOVERTICILLATA 



133 



regularly and, while typically consisting of small, simple clusters of sterig- 

 mata (figs. 36D and 39D), often appear as fragmentary structures without 

 consistent measurements or pattern. The principal unifying structures 

 tying the member-species together are the perithecia which are basically 



Fig. 35. Ascosporic stage of Penicillium javanicum series; P. jaranictun v. Beyma, 

 NRRL 707, on malt agar at two weeks. A, Intact perithecia; dark areas result from 

 air trapped within the perithecia, X 175. B, Broken perithecia showing the heavy 

 cellular wall and the fertile ascogenous tissue being squeezed out, X 175. C, Small 

 fragment of ascogenous tissue showing scattered asci, X 900. D, Asci and ascospores, 

 X 900. 



similar in origin, form, texture, and course of maturation in all species 

 (fig. 35). The perithecia arise in the manner described for Penicillium 

 hrefeldianum by Dodge (1933) and confirmed by Emmons (1935) (see fig. 

 14). A short branch arises vertically from a hypha at or near the surface 

 of the substratum, and by limited branching produces a loose tree-like net- 

 work. There is no evidence of sex organs or ascogonial coils at this stage. 



