GENERA AND SPECIES. 91 



2. Stereocaulon coralloides. Primary tliallus coarsely 

 granular or warty in young plants, grayisli-wliite, usu- 

 ally wanting in fully developed plants. Podetia rather 

 long and slender, more or less compressed, much 

 branched, profusely covered with coarsely granular or 

 warty outgrowths, light-gray to rather dark (cephalo- 

 dia common). Apothecia medium, nearly spherical, 

 often wanting. Disk brown to black. Spores color- 

 less, triseptate, elongated, ends pointed, 27/x X 6/x. 



3. Stereocaulon denudatum. Primary thallus gran- 

 ular and irregularly globular, usually wanting. Pode- 

 tia much as in S. coralloides^ thalloid warts more or 

 less confluent, sometimes flattened, greenish to gray ; 

 lower, hence older, portions of branches quite bare 

 (free from thalloid warts), and of a brownish color. 

 Apothecia and spores as in S. coralloides. 



Jf. Stereocaulon ramidosum. Primary thallus of 

 flattened squamules, with crenate margins usually want- 

 ing. Podetia usually long, otherwise, as in S, coral- 

 loides^ covered with flattened thalloid warts, with cre- 

 nate margins. Apothecia from small to large, simple, 

 confluent to flattened. Disk, dark-brown or black. 

 Spores as in S. coralloides. 



5. Stereocaulon paschode. Primary thallus granular, 

 usually wanting. Podetia long, much branched, cov- 

 ered with minutely branching outgrowths. Apothecia 

 and spores as in S. coralloides. 



Species 2, 3, 4 and 5 are in many respects closely 

 similar ; so much so that it seems probable that they 

 are mere variations of one species. Further oaroful olv 

 servation and study are necessary to prove whether or 



