224 ESSENTIALS OF BACTERIOLOGY 



Mucor Mucedo. Next to the Penicillium glaucum, this 

 is the most common mold. Found in horse-dung, in nuts and 

 apples, in bread and potatoes, as a white mold. 



Form. The mycelium sends out several branches, on one 

 of which a pointed stem is formed which enlarges to form a 

 globular head, a spore-bulb, or sporangium. The spore-bulb 

 is partitioned off into cells in which large oval spores lie. 

 When the spores are ripe, a cap forms around the bulb, the 



Fig. 109. Penicillium glaucum ( X 500) (Frankel and Pfeiffer). 



walls break down, and the wind scatters the spores, leaving 

 the cap or "columella" behind. The rounded sporangium is 

 usually black. 



Growth. Takes place at higher temperatures on acid media. 

 It is not pathogenic. 



Achorion Schonleinii. Trichophyton Tonsurans. 

 Microsporon Furfur. These three forms are similar to 

 each other in nearly every particular, and resemble in some 

 respects the Oidium lactis, in other ways, the mucors. The 



