56 



A MANUAL OF THE PENICILLIA 



the homogeneity of the P. luieum series as a natural group. For the pres- 

 ent, however, we beheve it is wise to hold together in one place all asco- 



FiG. 15. Tattern of perithecium development in Penicillium vermiculatum Dan- 

 geard, representative of the P. luteum series. A-D, Successive stages in perithecium 

 formation, magnified about 100 times. E, Perithecium partially crushed with asci 

 being expelled, and showing the loose character of the body and the absence of any 

 definite peridium, X 190. F, Asci in varying stages of maturity, X 800. G, Ripe 

 ascospores, X 2400. ' 



sporic species of Penicillium producing soft, loose-textured perithecia. 

 The reader is referred to Emmons' paper (1935) and to our discussion of 

 the series (pp. 564-573) for details of structure and development in the 



