TORTULACEAE 39 



G. Olneyi Sulliv. "On exposed rocks, Palisades and North- 

 ern N. J. and Southern N. Y.," Muse. App. 144. April. 



G. Pennsylvanica Schwaegr. "On dry rocks, common," 

 Muse. App. 143; Northport and Gowanus, L. Id.; Van Cort- 

 land Park, N. Y. Bot. Gardens, Tuckahoe, Eastchester; Closter, 

 N. J. Autumn-winter. 



RHACOMITRIUM Brid. 



Plants with much the habit and appearance of Grimmia, 

 but usually larger, and in many species bearing numerous short 

 lateral branchlets, giving the plants a peculiar modose appear- 

 ance. The leaves are hyaline pointed in most of our species 

 and the lower leaf cells, at least, are much elongated with thick- 

 ened sinuose-nodose cell walls, which character is the principal 

 distinction from Grimmia: the leaf margins are recurved in 

 almost all cases. 



1 — Some or all of the leaves with a hyaline point at apex 2 



Leaves lacking hyaline point acicuiare 



2 — Plants with many short lateral branchlets; upper leaf cells at least 3 



times as long as broad, sinuose microcarpum 



Short lateral branchlets lacking; upper leaf cells round-quadrate. 



sudeticum 



R. acicuiare (L.) Brid. "Rocky beds of streams, Palisades, 

 N. J.," Muse. App. 147; Bath, L. Id., Brainerd (H.S.)! Spring. 



R. microcarpum (Schrad.) Brid. "Exposed rocks in the 

 Ramapo Mts. of N. Y. & N. J., rare," Muse. App. 149; Closter, 

 Austin, Bx!; Muse. App. 148 issued as R. sudeticum from Suf- 

 fern, N. Y. & northern N. J. is in my set this species. Yonkers, 

 E. C. Howe, Bx! 



R. sudeticum (Funck) B. & S. Probably the only data for 

 this species from our range is from Muse. App. 148 as noted 

 above. Some of this number may possibly be this species. 



Family ii. TORTULACEAE 



With few exceptions short-stemmed mosses, radiculose at 

 base only, often caespitose, growing mainly on soil. Leaves 

 of various shapes, margin usually entire and of only one layer 



