64 Wisconsin Academy of Sciences, Arts and Letters. 
Costa vanishing near middle. 
Costa of perichaetial leaves excurrent into a thick point C. glomerata, 1, 
Costa of perichaetial leaves vanishing in or below apex . C. pendula, 2. 
Costa of perichaetial leaves vanishing far below apex . C. Ravenelii, 4. 
LEPTODON, p. 278. 
Leaves ecostate. * 
Leaf cells not pitted, capsule 2 mm. long . . L. triclioinitrion, 1. 
Leaf cells pitted, capsule 1 mm. long . . . L. Floridanus, la. 
Leaves costate. 
Leaf cells round-oval, capsule exserted, oblong-oval . L. Ohioensis, 2. 
Leaf cells narrowly rhomboidal, capsule immersed, sub- 
globose .Lo nitidus, 8. 
ALSIA, p. 279. 
Annulus 0. 
Costa vanishing at middle (smooth?), margins reflexed A, Californica, 1. 
Costa vanishing near apex, dentate on back, margins 
plane.A. longipes, 8.. 
Annulus compound, revoluble, leaves papillose at back . A. abietina, 2. 
NECKERA, p. 281. 
Leaves very obtuse 
Plants slender (shoots 2 mm. wide), leaves loosely im¬ 
bricate, rounded, concave.N. distich a, L 
Plants robust (shoots 4 mm. wide), leaves densely im¬ 
bricate, truncate, not concave.N. undulata, 2. 
Leaves rounded, abruptly apiculate. 
Revolute at base on one side, capsule immersed . N. Menziesii, 3. 
Not revolute, capsule exserted.N. complanata, 7. 
Leaves acute or acuminate. 
Ecostate or nearly so. 
Capsule immersed or half exserted. 
Shoots obtuse.N. pennata, 4. 
Shoots attenuate to apex. 
Segments rudimentary, capsule immersed . N. oligocarpa, 5. 
Segments as long as teeth, capsule 4 exserted . N. Douglasii, 6. 
Capsule exserted ........ N. puinila, 8. 
Costate to the middle or beyond. 
Margins broadly revolute . . . . , N. Floridana, 9. 
Margins not re volute. 
Alar cells fawn-color, costa thin, percurrent . N. Liidoyicise, 10. 
Alar cells opaque, costa vanishing . . . N. cymbifolia, 11. 
