GENERA AND SPECIES. 89 



2. BcBomyces ceruginosus. Thallus evenly spread- 

 ing, with rather large granules, gray-green. Stipes 

 very short or none. Apothecia quite flat, yellowish 

 disk. Spore-sacs long, cylindrical ; spores oblong, col- 

 orless, usually distinctly uniseptate, 17/x X 8/m, rather 

 variable in size and form. 



S. Bceomyces byssoides. Thallus granulose, with ele- 

 vated, flattened squamules. Stipes longer than in 

 ceruginosus, flattened above. Apothecia flattened. 

 Disk reddish-brown. Spores simple, colorless, ellip- 

 tical, 10/x X -i/A. 



2. Pilophoron. 



This genus is represented by one well-marked spe- 

 cies, which is" of rare occurrence. It seems to be some- 

 what northern in its range, preferring moist, shaded 

 places. 



The primary thallus is deficient, warty, greenish- 

 gray. The vertical thallus (secondary thallus, or pode- 

 tium) consists of an erect stem, which may be once, or 

 very rarely twice, branched toward the top. Upon 

 examining a transverse section it is found that this 

 stem is hollow (lumen is narrow, however), and that 

 it contains algjfe (Protococcus), thus being essentially 

 different from the stipe of Bceomyces. 



The apothecia are terminal, globose, black or blue- 

 black. The spores are simple, oblong to spindle- 

 shaped, colorless. 



1. Pilophoron cereolus. Primary thallus granular, 

 greenish to gray ; podetia, from medium to long and 

 slender, simple, or once or twice branched above, gran- 

 ular, greenish to gray. Apothecia comparatively large 



