34 Wisconsin Academy of Sciences , Arts and Letters. 
B. Auricles present. 
No lamina except small colored auricles 
. . . C. Hallii, 5. 
Lamina distinct. 
Perichsetial leaves concolorous. 
Auricles brown. 
Deeply concave .... 
C. liexuosus, 1. 
Plane, decurrent ... 
C. Tallulensis, 2. 
Auricles whitish, large. 
Leaves serrulate at apex 
C. subleucogaster, 7. 
Leaves spinulose serrate at apex . . . . C. Donnellii, 8. 
Auricles dirty red.C. angustiretis, 11. 
Perichsetial leaves with hyaline points (may include 8 
and 11 above).C. gracilicaulis, 10. 
II. Costa scabrous or lamellose at back. 
'Leaves with pellucid hair points.C. introflexus, 3. 
Leaves not hair pointed. 
Alar cells round, lamina 0 .C. frigidus, 6. 
No auricles.C. Tirginicus, 9. 
FISSIDEMS, p. 81 {incl. Conomitrium, p. 89. J ) 
I. (EUFISSIDENS.) Plants terrestrial or submersed but not floating; 
leaves soft , of one layer of cells. 
A. Fruit terminal. 
1. Monoicous, male flowers axillary. 
Leaf-cells small, densely chlorophyllose, in distinct rows F. limbatus, 5. 
Leaf-cells larger, not densely chlorophyllose, nor in dis¬ 
tinct rows.F. bryoides, 2. 
:2. Dioicous or monoicous with the male flowers terminal on a rooting 
branch at the base of the female stem. 
a. Leaf-cells 14-2 times as long as icide, large , distinct. 
Plants less than 1 mm. high, leaves two or three pairs F. Closteri, 1. 
Plants 2-4 mm. high, wholly hyaline, leaves 3-5 pairs F. hyalinus, 9. 
1 See Barnes: Bot. Gaz. xii (1887) 1. 
