CULTIVATION AND EXAMINATION 49 



Photographic Equipment 



A limited amount of photographic equipment is a very valuable aid in 

 the study of this or any other group of molds. A camera should be avail- 

 able which can be used in conjunction with a compound microscope, and 

 to which low-power lenses can be attached directly. In addition to a good- 

 quality lens producing pictures above and below natural size, a series of 

 Tessar lenses which will provide magnifications of from 5 to 30 diameters 

 is extremely useful. With the aid of these, details of colony structure can 

 often be recorded which cannot be pictured with the lenses of the compound 

 microscope and which are very difficult to describe adequately in words. 

 With these low-power lenses it is possible to photograph types of fruiting 

 heads, the relative abundance of conidial structures to vegetative mycelium, 

 and the relationship between each of the above and sclerotia or perithecia 

 when such structures are present. 



