210 ILLINOIS BIOLOGICAL MONOGRAPHS [448 



GENERAL EXPLANATION OF FIGURES 



For the type species of each genus, both the vegetative form and the 

 spore are illustrated. For the other species, except those which are new, 

 figures of the spore are given, unless the vegetative forms are different 

 from those of the type species or the species were reported in papers which 

 seem to be of less universal distribution. 



The original drawings were made with the Abbe drawing apparatus. 

 The combinations used were Zeiss apochromatic objectives 16, 8, 3, and 

 homogeneous oil immersion 2 mm. with compensation oculars 2, 4, 6, 8, 

 12 and 18. All the other drawings were copied from the original figures of 

 the respective observers, an exact citation of which is given in each case, 

 and were also made with the same drawing apparatus on the same scale 

 except that a few figures were enlarged among those that were taken 

 from other authors. 



Magnifications were also calculated and given for those quoted figures, 

 for which the respective authors failed to mention the scale at which the 

 drawings were made. 



