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A MANUAL OF THE PENICILLIA 



Our notes augmenting Emmons' description follow: 



Colonies on Czapek's solution agar growing fairly rapidly, attaining a 

 diameter of 3.5 to 4.0 cm. in 2 weeks (fig. 147A), consisting of a floccose, 

 tufted felt about 0.5 to 1.0 mm. deep in central area, comparatively tough. 



Fig. 147. renicilluitn stipitahim Thoiu. A and B, Ten-day-old colonies of NRRL 

 1006 on Czapek and malt agars. C, Perithecia in NRRL 2105 as seen under low 

 powers, X 30. D, Mature ascospores, X 1500; note the conspicuous equatorial ridge 

 that is characteristic of this species. 



producing abundant perithecia in a layer near or adjacent to the agar sur- 

 face, commonly obscured by an overlying mycelial felt, azonate, at first 

 in bright yellow shades near citrine yellow, in our cultures developing a 

 greenish cast in age; penicilli lacking or limited in number, usually frac- 



