BARNES — NORTH AMERICAN MOSSES. 209 



PHYSCOMITRIUM, p. 196. 



Capsule or seta immersed. 



[P. Sookeri may be sought here.] 



Capsule subglobose ...... P. Immersum, 196. 



Capsule pyriform when fresh. .... P. Coloradense, ZSO. 



Capsule and seta exserted. 

 Leaves entire or nearly so. 

 Seta short, but little exceeding leaves . . P. Hookeri, 198. 

 Seta much longer (5-20 mm.). 

 Leaves very acute, bordered ... P. acaminatnm, 198. 

 Leaves oblong-lanceolate, more obtuse, not bor- 

 dered P. Californicnm, S5S. 



Leaves serrate at least above the middle. 

 Mouth of capsule bordered by 4-8 rows of cells. 

 Seta straight. 

 Leaves oblong acuminate, annulus double P. pygmseum, 197. 



Leaves lanceolate, annulus apparently single P. Drummondii, SSI. 

 Leaves ovate-acuminate, annulus apparently 



single P. Eellermanii, S49. 



Seta curved P. australe, S53. 



Mouth of capsule bordered by 8-12 rows of cells. 

 Capsule turbinate, 1-2 mm., mouth flaring P. turbinatnm,^ 198. 

 Capsule pyriform, 2-3 mm. mouth not flaring P. megalocarpum, S48. 



The revision of the genus by Mrs. E. G. Britton, Bull. Torr. Bot. Club 

 21: 189. 189i, has been followed. -P. pyriforme Brid. is a European 

 species and does not occur in America; American specimens called pyri- 

 forme are referable to P. turbinatum Mtill. P. strangulatum Kindb., 

 Ott. Nat. 4: 62, is reduced to P. turbinatum. P. platyphyllum Kindb., 

 Mac. Cat. 269, is rejected, as the species is founded upon such very imma- 

 ture specimens that it probably can not stand. 



ENTOSTHODON, p. 199. 



Leaves acute, capsule short-pyriform. 



Costa percurrent, teeth dark red, striolate . E. Drummondii, 199. 

 Leaves acuminate, capsule long-pyriform. 



Costa reaching middle, teeth whitish, granulose B. Bolanderi, 199. 



Costa subpercurrent, teeth red, nodose, papillose E. Templetoni, 200. 



' See also Appendix, nos. 245-247. 



