BARNES NORTH AMERICAN MOSSES. 303 



double annulas, the outer orange colored, inner vesicular, hyaline; lid 

 large, conic, rostrate when dry, also bordered with orange cells; spores 

 warty, not spinose. Bull. Torr. Bot. Club 21: 206. 1894. Colorado; on 

 muddy banks of the Missouri River, Great Falls, Montana. 



251. Physcomitrium Drummondii Britt. Plants gregarious or scat- 

 tered, 3-10 mm. high; stems with short basal branches; leaves narrow, 

 strictly erect, lanceolate-acuminate, serrate above middle, marginal cells 

 longer and broader, inflated or yellow, basal cells lax; vein thick, ending 

 below the apex or excurrent into a cuspidate point: seta stout, straw-col- 

 ored or brown when old, short, erect, slightly twisted; capsules pyriform 

 turbinate, not contracted below flaring mouth when dry, bordered by 6-8 

 rows of narrow elongated thick brown cells very distinct from cells with 

 sinuous walls of rest of capsule; annulus narrow, orange-colored, persist- 

 ent, with a second incurved hyaline row; lid conic-rostrate, bordered by 

 orange, beak as long as spore sac, which is shallow and broad; neck 

 contracted below spore sac, stomatose; spores large, warty. Bull. Torr. 

 Bot. Club 21: 205. 1894. Physcomitrium acuminatum L. & J. Man. 

 198. 1884 in part. Louisiana; Canada; Missouri; Oregon. 



252. Physcomitrium atistrale Britt. Autoicous, antheridia terminal 

 and cotemporaneous with fruiting axis: plants gregarious, tall, slender, 3-4 

 cm. high; stems branching repeatedly and rooting at joints: lower leaves 

 short, distant, with vein ending below the apex, upper crowded around 

 base of seta, all narrow, oblong lanceolate, serrate above middle, marginal 

 cells narrower and longer, teeth small, appressed; vein ending below acute 

 apex: seta short, pale, twisted and curved; capsules often cernuous, sub- 

 globose becoming turbinate and flaring at mouth when dry and empty, 

 small, often broader than long; neck tapering, contracted and stomatose; 

 lid flat and apiculate when dry, conic when moist, bordered with brown; 

 mouth bordered by 5-8 rows of large clear cells and a darker annulus, with 

 a second row of hyaline cells incurved and almost invisible; surface cells 

 irregular with thick walls; spores brown, rough, warty. Bull. Torr. Bot. 

 Club 21: 201, 1894". Apalachicola, Fla. 



253. Physcomitrium Californicuin Britt. Autoicous, antheridia ter- 

 minal, becoming lateral by innovations: plants gregarious, 10-15 mm. 

 high: leaves few, basal, oblong-lanceolate, bordered by a double row of 

 elongated cells, entire or occasionally serrulate above middle; vein thick, 

 ending below acute apex; cells lax, oblong, marginal obliquely septate: 

 seta slender, twisted, often brown; capsules small, globose when mature 

 and empty, more or less cylindrical when young; lid conic, short, blunt; 

 neck short, wrinkled, and contracted below spore sac when dry, stomatose; 

 mouth bordered by a narrow orange-colored annulus and 5-11 rows of 

 slightly denser scarcely differentiated cells; calyptra cucullate, lobed and 



