434 A MANUAL OF THE PENICILLIA 



growth arising from a tough mycelial felt, irregularly wrinkled (fig. 113A), 

 with central or subcentral colony areas commonly raised, 1 to 2 mm. deep, 

 producing conidial heads most abundantly in marginal zones with central 

 areas white to very light gray, fruiting areas in pale green to glaucous 

 gray shades near dark glaucous gray (Ridgway, PI. XLIII) or court gray 

 (R., PI. XLVII); exudate lacking or limited; odor lacking or indefinite; 

 reverse colorless to light yellowish drab shades; conidiophores arising 

 mostly as short branches from aerial hyphae 100 to 200m in length, less 

 commonly from the substratum and ranging from 250 to 600^ by 2.5 to 

 3.0/i with walls smooth or delicately roughened; penicilli comparatively 

 large, asymmetric, irregularly branched and tending to become divergent, 

 bearing tangled and irregular spore masses up to 50 to 75^ in length; 

 branches variable, commonly 10 to 20/x by 2.0 to 2.5m, occasionally longer, 

 often arising low on the conidiophore and not appearing as an integral 

 part of the terminal penicillus; metulae few in the verticil, about 8 to 

 12m by 2.0 to 2.5m, commonly borne at different levels; sterigmata borne 

 in clusters of 5 to 10, measuring about 7.0 to 8.5m by 2.0 to 2.5m, definitely 

 constricted at the point of spore origin; conidia globose to subglobose, 2.5 

 to 3.0m in diameter with walls finely granular, appearing dull gray-green 

 in mass. 



Colonies on steep agar growing more rapidly, attaining a diameter of 

 3.5 cm. in 10 days, marginal zones 1 to 2 mm. wide, white, shading through 

 court gray and gnaphalium green (R., PI. XLVII) to storm gray (R., 

 PI. LII), with the development of mature penicilli, otherwise as on Czapek 

 except sporulating more abundantly and producing somewhat more exu- 

 date as small colorless drops embedded in the colony; penicilli as on Czapek 

 but commonly larger. 



Colonies on malt agar about 2.5 to 3.0 cm. in diameter, plane, loose- 

 textured, heavily sporulating (fig. 113B), with conidiophores arising from 

 the substratum and presenting the aspect of a deep velvety colony, colony 

 coloration as on steep agar; penicilli as described above. 



Species description based primarily upon NRRL 2009, a culture received 

 from the Centraalbureau as Westling's strain of this species; presumably 

 type. Numerous cultures have been examined by us which are charac- 

 terized by lanose colonies that run through a series of gray-green shades in 

 the growing period and which produce conidia generally 3.0m or less in 

 diameter. The tendency of these forms to produce penicilli more or less 

 divaricate and the faint roughening of the conidia suggests relationship 

 to the Divaricata. 



Penicillium lanoso-viride Thom, in The Penicillia, pp. 314-315. 1930. 



Colonies upon Czapek's solution agar attaining a diameter of 2.5 to 

 3.0 cm. in 10 to 12 days at room temperature, azonate or with traces of 



