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. (KoUe 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 (w) remaining; 3, two 

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

 spores; s, ruptured sporangium of Mucor muciVaginus with deliquescing wall 

 {m) and swollen interstitial substance (2); sp, spores. (After Brefeld.) 



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

 some among the Ascomycetes, and some among the Phycomy- 



