68 BRYACEAE 



4 — Costa long excurrent; dioicous. (See B. capillare) caespiticium 



Costa long excurrent; synoicous intermedium 



Costa percurrent or shortly excurrent 5 



5 — Leaves decurrent 6 



Leaves not decurrent; dioicous capillare 



6 — Synoicous bimum 



Dioicous pseudotriquetrum 



7 — Costa plainly vanishing below apex (plants silvery and shining when 



dry) , common argenteum 



Costa excurrent or percurrent : 8 



8 — Synoicous intermedium 



Dioicous caespiticium 



SUBGENUS I. CLADODIUM 



Inner peristome more or less adherent to the outer, with cilia 

 lacking or rudimentary; when present the cilia are not appen- 

 diculate. 



Section 1. Ptychostomum 



Outer teeth with irregular oblique or vertical lines on the 

 inner surface, connecting the transverse articulations of the 

 lower portion of the teeth. 



B. pendulum (Hornsch.) Schimp. "About roots of trees in 

 open woods, near Closter, N. J.," Muse. App. 196. Spring- 

 summer. 



Section 2. Eucladodium 



Differing from Section 1 in the lack of oblique or vertical 

 markings between the articulations of the teeth. The species 

 of this section are rare and seldom collected. 



B. uliginosum (Bruch) B. & S. Yonkers, E. C. Howe Bx!; 

 Hoboken, N. J., Austin, Bx!; wet rocks near Haverstraw 

 (N. Y.), Muse. App. 191. Late summer. 



SUBGENUS 2. EUBRYUM 



Peristome perfect, inner free from outer, cilia nearly or quite 

 as long as segments, appendiculate. Spores smaller than in 

 Cladodium. 



Section 1. Leucodontium 



Teeth of peristome pale yellow throughout, base of teeth 

 scarcely thicker. (Though European authors emphasize the 

 color of the teeth, I am unable to make use of it.) 



