148 A MANUAL OF THE PENICILLIA 



in 2 weeks at room temperature; plane or nearly so, typically consisting of 

 a dense layer of perithecia enmeshed in a limited non-flocculent network of 

 sterile hyphae, with colony surface finely but conspicuously granular in 

 orange-j^ellow shades near cinnamon-buff through clay color to tawny olive 

 (R., PI. XXIX) occasionally showing pinkish tints; no exudate produced; 

 odor lacking; reverse in deep orange-red shades; penicilli few in number, 

 fragmentary; perithecia as described above, developing abundant ripe asci 

 and ascospores in 12 to 14 days. 



Colonies on malt agar spreading broadly, plane, consisting of a fairly 

 close, thin layer of perithecia enmeshed in a loose network of sterile hyphae 

 (fig. 40B) ; colonies appearing conspicuously granular, from ivory yellow to 

 deep colonial buff (R., PI. XXX), in some strains tending to produce con- 

 spicuous sectors differing in the relative abundance of perithecia and vege- 

 tative growth; penicilli very fragmentary, limited in number; perithecia 

 ripening quickly, producing abundant asci within 10 to 12 days. 



Colonies on hay agar spreading, 5.0 to 6.0 cm. in 2 weeks, very thin, 

 growing irregularly, producing abundant perithecia; conidial structures 

 scattered but usually more abundant than on the above media, very irregu- 

 lar in pattern with elements as described on Czapek; perithecia ripening 

 quickly with mature asci and ascospores in 8 to 10 days. 



Species description based upon Klebahn's type received from him in 

 July 1931 and now maintained as NRRL 708. This culture had been iso- 

 lated originally by Professor F. Ehrlich, Breslau, and was reported to pro- 

 duce a strong pectin-dissolving enzyme. The species is also represented 

 by NRRL 709 obtained from the Thom Collection as No. 5409. A culture 

 received from the Centraalbureau as Klebahn's type, hence duplicating 

 NRRL 708 in origin, differs from the latter only in producing colonies which 

 tend to develop sectors characterized by less abundant perithecial develop- 

 ment. Measurements obtained in our observation, as recorded above, are 

 in almost complete agreement with Klebahn's original species diagnosis. 

 The strains of PeniciUium ehrlichii in our possession appear to suffer from 

 some nutrient deficiency since they grow very restrictedly upon Czapek's 

 solution agar containing sucrose, nitrate, and other mineral salts but grow 

 luxuriantly upon media such as steep, malt, and hay agars which contain 

 extracts of natural products. 



PeniciUium levitum Raper and Fennell, in Mycologia 40: 511-515, 



fig. 2. 1948. 



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

 3.0 to 4.0 cm. in 2 to 3 weeks at room temperature, comparatively thin, 

 consisting of a close felt, tearing with difficulty, central area raised, pulling 

 away from the culture dish and usually splitting along deep radial furrows 



