ANELLARIA SEPARATA 359 



that the arc-light could shine on the mirror. The exposure was 

 for about four seconds. At its end, the black cardboard sheet 

 was replaced in its old position. Then the photographic plate 

 was covered and taken to the dark-room for development. The 

 magnification of the hymenium was 640 diameters. 



Before the spores develop pigment, or even after they have 

 become slightly brown, they have almost the same tint as the 

 background made up of the gill substance. It is therefore difficult 

 to get good photographs of the white areas of the mottled gill- 

 surface. The clearest results of my efforts in this direction do not 

 seem to me worthy of publication. The best idea of a white area 

 may be obtained from such a camera-lucida drawing as is shown in 

 Fig. 89 for Panaeolus campanulatus (p. 257). 



We shall again return to the subject of photography of the 

 hymenium in connection with the Coprini. With those fungi the 

 gills were photographed without any immersion in w T ater. The 

 same method can be applied to Anellaria separata, but the results 

 which I thus obtained were not so good as those obtained by the 

 method just described. 



