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Analytic Keys to the Species of Mosses. 47 
Upper leaves not bearing gemmae. 
Dry capsule costate only at narrow mouth . . U. Ludwigii, 2. 
Dry capsule costate its whole length. 
Stems creeping, leaves slightly crispate, peristome 
simple.U. Druininondii, 1. 
Stems not creeping, leaves strongly crispate, peristome 
double. 
Mouth of capsule contracted .... U. Brucliii, 4, 
Mouth of capsule not contracted. 
Tufts brown, on rocks.U. curvifolia, 8. 
Tufts green, on trees. 
Capsule contracted below the mouth U. crispjL 5. 
Capsule not contracted below the mouth . U. crispnla, 7. 
XJ. Americana of Mitten (no. 6), is allied to the last two species, and I 
am unable to see wherein it differs in any features which can be used in 
a key. 
ORTHOTRICHUM, p. 164. 
I. Leaves obtuse. 
Margins plane, stomata superficial ....(). obtusifoliuni, 81. 
Margins revolute. 
Peristome simple, on rocks.0. Jamesiamnn, 82. 
Peristome double, in water.0. rivulare, 30. 
II. Leaves with hyaline points. 
Plants large (7-8 cm.).0. Pringlei, b 
Plants smaller (about 1 cm.). 
Teeth equidistant, cilia of 1 row of cells . . 0. diapliamim, 28. 
Teeth bigeminate, cilia of 2 rows of cells ... 0. camim, 29. 
III. Leaves acute , without hyaline points, margins revolute or recurved. 
A. Stomata superficial. 
1. Peristome simple. 
[OO. Texanum and rupestre may be sought here.] 
Capsule wholly exserted, smooth when dry. 
Defluent into seta.0. laevigatum, 2. 
Abrupt at base.0. Douglasii, 6. 
1 Miiller: Bull. Torr. Bot. Club., xiii (1886), 120. But July 18, 1888, he writes: “Mein O. 
Pringlei ist forma longifolia crispata papillosa von 0. Lyellii,xmd anderer mal O. papillosum 
und 0. Pacificum Hampe ”! — fide Mrs. E. G. Britton. 
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