CoKER: NortH AMERICAN SPECIES OF ENCALYPTA 441 
Encalypta commutata Nees & Hornsch. Bryol. Germ. 2: 46. 1827. 
Leersia alpina Lindb. Musci Scand. 20. 1879. 
Plants 4-6 cm. high; leaves 3-4 mm. by I mm. subspatulate, 
carinate; apex cucullate when moist; costa excurrent into a long 
hair-point or ending below the apex, smooth except for a few teeth 
just below the apex of leaf; margin plane; upper cells hexagonal, 
I2u-16u, not densely papillose; cells of hyaline base 32u-48y 
long by 16u wide, walls not thickened, becoming narrower and 
longer toward the margin; perichaetial leaves smaller and tapering 
to a long hair point. Monoicous; vaginule about 1 mm. long; 
seta 7-9 mm. long, orange, seldom twisted; calyptra laciniate 
at base, very slightly papillose at apex; lid 1.5 mm. long; annulus 
of 2-3 rows of cells; capsule 2-3 mm. long by 0.75 mm. wide, 
cylindric, smooth when young, appearing striate when old; mouth 
marked by 1-2 rows of small red-brown quadrate cells often 
irregularly broken; neck short, wrinkled, stomatose; peristome 
none; spores 25u-35u, warty, often flattened and irregular, ripe 
in late summer. 
TYPE LocaLity: European. 
DIsTRIBUTION: Alpine regions of the Rocky Mountains from 
Colorado to Washington; Alaska and Greenland. Also Europe 
and Asia. 
ILLUSTRATIONS: Sowerby, Engl. Bot. pl. r4rg9. 1805; Weber 
& Mohr’s Beitr. 1: pl. 4. 1805; Schwaegr. Suppl. 1: pl. 16. 1811 
(as E. affinis); Bryol. Eur. pl. 198. 1838. 
ExsIccATAE: Drummond, Musci Am. 49. 1828 (as E. affints). 
4. ENcaLypTa LacINIATA (Hedw.) Lindb. Acta Soc. Sc. Fenn. 
10: 267. 1872 
Bryum extinctorium var. 8. L. Sp. Pl. 1116. 1753 (see Dillen, 15 
P- 349; also Druce & Vines, 47, p. 210). 
Leersia laciniata Hedw. Fundam. 2: 103. pl. 5, f. 24a. 1782. 
Leersia ciliata Hedw. Descr. 1:49. 1787. 
Encalypta ciliata Hoftm. Deuts. Fl. 2:27. 1796. 
Encalypta mexicana C. Mill. Syn. 1: 516. 1849. 
Encalypta alaskana Kindb.; Macoun, Cat. Can. Pl. 6: 269. 1892. 
Plants growing on wet limestone rocks; about 1-3 cm. high; 
leaves carinate when moist, up to 5 mm. long, to about 1.3.mm. 
wide; apical blade elliptic or lingulate, suddenly contracted to 
a short mucronate point; costa thick, tapering into the short 
finely serrulate tip or ending below the apex, slightly toothed on 
