82 GUIDE TO THE STUDY OF LICHENS. 



1. Coniocyhe} 



The representatives of this genus are few and insig- 

 nificant; close examination is necessary to detect 

 them. Usually, they occur upon the bark of trees in 

 shaded places ; less commonly upon decaying wood. 

 The thallus is generally visible to the naked eye, and 

 has a yellowish tinge. The apothecia and stipes are 

 of a light color, never black ; however, the color is 

 quite variable, ranging from almost white to brownish- 

 gray and reddish-brown. The alg^e seem to belong to 

 the genus Chroolepus and, therefore, occur in chains. 

 The spores are spherical, small, simple, colorless, or 

 faintly yellowish, with a distinct, irregular exosporium, 

 which is readily removed, T/x to 8/x.^ 



Coniocyhe pallida is the only species which is likely 

 to be found. Coniocyhe furfur acea is usually sterile, 

 that is, devoid of stipes and apothecia. 



1. Coniocyhe pallida. Thallus usually indistinct, 

 whitish. Stipes comparatively long and slender, from 

 nearly white to brown, bearing single globose apo- 

 thecia of nearly the same color as the stipe. Spores 

 simple, colorless, exosporium quite distinct, 1 fx. to 8/x. 

 On bark. New England (New Hampshire), Iowa. 



2. Coniocyhe furfuracea. Thallus quite distinct, of 

 a sulphur color. Stipes, apothecia and spores as in 

 C. pallida. On the exposed roots of trees and decay- 

 ing wood. New England, New York. Sterile in Iowa. 



1 The spores of all the genera mentioned are figured on Plates V to 

 XI inclusive. The genera are given alphabetically. 



2 A /(i or micron equals a thousandth of one millimeter or one 

 twenty-five-thousandth of an inch. The measurements are made 

 with the aid of an eye-piece micrometer. 



