ASYMMETRICA-FASCICULATA 553 



Penicillium claviforme Bainier is perhaps the most striking member of 

 the genus and, once observed, cannot easily be mistaken. Apparently, the 

 species is not common in nature for few original isolations have been re- 

 ported. 



Strains of Metarrhizium anisopliae (Metschnikoff) Sorokin are occasion- 

 ally isolated from insects or soil in which the massed conidial structures 

 (typically forming sporodochia) bear a limited resemblance to the coremia 

 of Penicillium claviforme, particularly wlien the latter are connected by 

 bridges of aerial hyphae. Penicillium anisopliae (Metsch.) Vuillemin, 

 sometimes considered in relation to P. claviforme Bainier, is in reality not a 

 Penicillium but a Metarrhizium (see p. 22). 



Penicillium clavigerum Demelius, in Verhandl. Zool.-Bot. Gesellsch. Wein 



72: 74-75, fig. 4. (1922) 1923 



Colonies on Czapek's solution agar growing rather restrictedly, attaining 

 a diameter of 3.0 to 4.0 cm. in 10 to 12 days at room temperature, very 

 strongly fasciculate throughout with the coremiform aspect dominating 

 the entire colony (fig. 142A); coremia 7sana-like, simple (fig. 142C), 

 rounded, or more or less flattened and even spraying out into a number of 

 sporulating tips, variable in length up to 3 or 4 mm. ; simple coremia com- 

 monly of uniform diameter throughout with apices usually pointed and 

 with penicilli more concentrated in terminal portions, but generally borne 

 over their entire length ; coremia seldom clavate and rarely showing a clear 

 differentiation into stalk and spore bearing areas, white at first but de- 

 veloping dull yellow-green shades near slate olive (Ridgway, PI. XLVII) 

 when mature and finally deep slate olive in age; exudate limited, lightly 

 colored, borne near the agar surface and often obscured by the developing 

 coremia; odor pronounced, moldy; reverse quickly becoming dull pinkish 

 brown, darkening in age; penicilli abundantly produced, borne primarily 

 upon sinuous and interlacing conidiophores (fig. 142D) which comprise 

 the body of the coremium; conidiophores variable in length, mostly very 

 long up to several millimeters by 3.5 to 4.0m hi diameter, with walls smooth; 

 penicilli asymmetric, commonly showing one or two branches (fig. 142D) 

 in addition to the main axis, but not infrequently bearing a single terminal 

 verticil of metulae; branches mostly 10 to 15^ by 3.5 to 4.0ju; metulae 

 usually in groups of 2 to 4 measuring 8.0 to 12/x by 3.0 to 3.5jli, slightly 

 inflated at the apices; sterigmata crowded, commonly borne in clusters of 

 6 to 10, mostly 7.0 to 9.0m by 2.0 to 2.5m gradually tapered to conidium 

 bearing tips in a manner suggestive of the Biverticillata-Symmetrica; 

 conidia elliptical 3.0 to 4.0m by 2.2 to 3.0m, ^vith walls*smooth. 



Colonies on steep agar as described above except conidial areas quickly 

 becoming dark, approaching dull greenish black (R., PI. XLVII) in 10 to 

 12 days, abundant slime produced and conidial chains becoming wet, com- 



