MICHIGAN ACADEMY OF SCIENCE. 91 



The cuuidia are boiue at the apex of the fiiiitiuy liyphae, beiu^ 

 I'onued by a simple cuttiug-oti' process. These hyphae are more 

 slender than the vegetative mycelium aud not so much septate. 

 The couidia occur in chains and are occasionally two-celled though 

 this is not common, most of the spores being single celled. They 

 vary in size from 3-4 microns in diameter aud 7.5-12 microns in 

 length. They are ordinarily rather a broad oval, sharply pointed 

 at one end but in the case of the two-celled forms we find them 

 more cylindrical in shape. The chains are very easily broken and 

 the spores detached so that it requires careful handling to observe 

 them. 



Spore germination takes place in from 20 to 26 hours, depend- 

 ing somewhat on the medium used. On germinating the spore 

 sends out a rather large germ tube Avliich may come from either 

 end of the conidium or from both. This becomes septate soon 

 after its appearance, being many septate under normal conditions. 

 The branching is very profuse, the branches originating directly 

 back of the septa aud in some cases occurring from nearly every 

 cell. The mycelial strands occasionally show a fusion but this is 

 uncommon and the writer has observed it only in two cases. 



Spore production takes place very soon, usually in two days upon 

 ordinaiy media. The fruiting hyphae begin to cut off into couidia, 

 at the apex of each tip if the hyphae be branched, and continue to 

 bud off into more couidia. There soon is produced a very compli- 

 cated chain of couidia, the whole cluster forming a complex 

 branched mass. 



As said before, these are very easily broken and in some of the 

 older works we see the fruiting hyphae shown as having only the 

 remnants of the spore chains still adhering to the conidiophore. 



