BULLETIN 
TORREY BOTANICAL CLUB. 
Neti a | 
Contribution to American Bryology—XI. 
By EvizAsetH G, Britton. 
I, COSCIN ODON RAUI AND COSCINODON RENAULDI. 
(PLATE 248.) 
Owing to the fact that the upper part of the leaf in Coscinodon 
is Colorless, it has happened that in the first descriptions of both 
C. Wrightii and C. Raut, the vein has been described as ending 
below the apex. In describing C. Wrightii Sullivant said of the 
leaf that it was « costate half way’ (Mosses U. S. 38. p/. 4. 1856). 
In the Icones (71. pl. 45. 1864), he corrected this mistake, figuring 
the vein extending into and forming the awn. 
Austin made the same mistake about C. Raui (Bull. Torr. Bot. 
_ Club, 6: 46. 1875), describing the leaf with the vein ending below 
the apex, « costa valida sub apice finienti,” yet in the type speci- 
; mens preserved in his herbarium at Columbia College, the vein is 
Clearly €xcurrent, forming a terete, white awn, most clearly seen in 
Old abraded leaves when the blade is torn away. He recognized its 
_ true character in C Wrightit, for he says of it “costa extending into 
the much longer, more terete and more scabrous hair point;’’ yet 
he failed to see it in his own species. This is the more remarkable, 
4s he had in his herbarium an original sketch of the leaves by E. 
A. Rau, on the margin of which Mr. Rau had written, “ Leaves 
throughout chlorophyllose, except the long excurrent costa or tip.” 
In the Manual (L. & J. Mosses of N. Am. 155, 1884) this mis- 
