56 



AGRICULTURAL AND INDUSTRIAL BACTERIOLOGY 



nearest the mother cell is the youngest. In other molds 

 spore formation results from the budding out of a cell (not 

 a pinching off) from the terminal cell. The spore then 

 grows to its full size, and from its tip another spore buds 

 out. A continuation of this process also results in the for- 

 mation of a chain of spores. In this type of spore forma- 

 tion, however, the chains are sometimes branched, that is, 



FIG. 37. MOLD SPORES (CONIDIA). 1. Various types of unicellular 

 spores. 2. Types of spores with two cells. 3. Multicellular 

 spores. 



more than qne spore may bud from a single cell. The 

 terminal cell of the chain is always the youngest. 



The conidia developed by molds are of many shapes and 



FIG. 38. TYPES OF SPORE PRODUCTION BY MOLDS. 1. Chlamydospores 

 of Mucor. 2. Conidia production in MullerieUa, no conidio- 

 phores produced, the conidia arising laterally directly from the 

 mycelium. 3. Urospora showing simple conidiopliores. 4. Con- 

 idiophore of Aspergillus. 5. Conidiophore of Penicillium. 

 (After Brefeld.) 



sizes. The simplest type of conidium is that which is sin- 

 gle-celled and oval or spherical in shape. Other single- 



