40 Structure and Classification of Micro-organisms 



THE MOLDS 



In this group it is customary to place a miscellaneous collection 

 of organisms having in common the formation of a well-marked 





Fig. 9. Oidium. (Kolle and Wassermann.) 



mycelium, but being so diversified in other respects as to place them 

 in widely separated groups in the systematic arrangement of the 



Fig. 10. Mucor mucedo: i, A sporangium in optical longitudinal section; 

 c, columella; m, wall of sporangium; sp, spores; 2, a ruptured sporangium with 

 only the columella (c) and a small portion of the wall (m) remaining; 3, two 

 smaller sporangia with only a few spores and no columella; 4, germinating 

 spores; 5, ruptured sporangium of Mucor mucilaginus with deliquescing wall 

 (m) and swollen interstitial substance (z); sp, spores. (After Brefeld.) 



fungi. Some are correctly placed among the "Imperfect fungi," 

 some among the Ascomycetes, and some among the Phycomy- 



