CEPHALOZIA 198 
fleshy, surrounded at the base by the sterile archegonia. Capsule 
long-exserted on a very delicate pellucid seta, cylindrical-oblong, 
or oblong-globose, quadrivalvular to the base, the walls bistratose, 
cells of the inner layer with semiannular thickenings.  Elaters 
bispiral, deciduous, subobtuse, mostly 1 50-200 p long and 8-10 м 
wide. Spores,smooth or minutely roughened, about 8-10 p. 
| Key to the Species. 
Leaf cells 30-60 и. 
Leaves bifid to the middle or a little below, longer than broad ; perianth-wall uni- 
Stratose unless at extreme base. I. C. bicuspidata. 
Leaves bifid about 14 their length, commonly as broad as long or broader ; peri- 
anth-wall of 2 or 3 layers of cells for 16-24 its length. 
Dioicous; leaves .18-4 mm. in diameter, decurrent, nearly horizontal or 
subassurgent. . C. media. 
Monoicous ( polyoicous 2) ; leaves .3-.55 mm. in diameter, scarcely ог not at 
all decurrent, assurgent or vertical-connivent. 2. C. pleniceps. 
Leaf-cells 10-20 y. 
Ramification ventral ; leaves distant or subimbricate, their lobes usually very entire 
and often divergent. 4. C. divaricata, 
Ramificati 
1 
nly lateral ; leaves mostly approximate, often crowded and equi- 
tant, complicate-bilobed, the margins sharply and unequally serrate-dentate. 
5. С. Turneri. 
I. CEPHALOZIA BICUSPIDATA (L.) Dumort. Rec. d’Obs. Jung. 18. 
1835. 
Jungermannia bicuspidata 1. Sp. Pl. 1132. 1753. Hook. 
Brit. Jung. РА 17. 1816. | 
Jungermannia Lammersiana Hüben. Flora, I5: 306. 1832. 
Jungermannia extensa Tayl. Lond. Jour. Bot. 5: 279. 1840. 
Cephalozia extensa Spruce, On Cephalozia, 44. 1882. 
Eucebhalozia bicuspidata Schiffn.; Eng. & Prantl, Nat. Pflan- 
zenfam. 12: 07. 1895. 
color, 
rather 
cells i 
Subimbricate or crowded, all bifid 1—8 their length, concave, often 
subcomplicate. the sinus obtuse, lobes ovate-lanceolate, triangular- 
lanceolate 
tenuate to an apiculus 2-4 cells in length ; leaf-cells rather large, 
