BARNES NORTH AMERICAN MOSSES. 261 



36. Plenridinm alternifolium Howei Ren. & Card. Differs from the 

 typical form in the leaves being entire or slightly denticulate at the apex. 

 Revue. Bryol. 19: 64. 1892. California. 



37. Micro!) ryum Floerkeanum Henrici R. & C. Differs from the 

 typical form in the green color of the plant, and the excurrent costa often 

 hyaline at the point. Bot. Gaz. 14: 91. 1889. Sandy ground: Saline 

 Co., Kansas. 



38. Bruchia longicollis Eaton. Plants densely clustered, 7-10 mm. 

 high: stem leaves with a broadly ovate clasping base suddenly narrowed 

 a into long excurrent awn like costa, which is bordered below by leaf mar- 

 gin: perichaetial leaves lanceolate, somewhat tubulose, gradually acumi- 

 nate, costa excurrent: flowers monoicous: capsule exserted on a stout seta, 

 orange yellow, collum very long, exceeding sporangium, stomatose beak 

 slender. Bull. Torr. Bot. Club 17: 100. pi. 101. 1890. Decayed logs in 

 swamp: New Hampshire. 



39. Bruchia fusca Britt. Plants gregarious, 2-3 mm. high: leaves few, 

 three to six, erect appressed, short, clasping, often broader than long and 

 tricuspidate, entire or subserrulate, with a narrow border of small retuse 

 cells, apex obtuse, acute or cucullate; costa faint, vanishing below apex or 

 absent in lower leaves, basal cells lax: seta immersed or slightly exserted, 

 straight or curved; capsule large and broad, 1-1.5 mm. long, entirely 

 exserted, ovoid-pyriform, suddenly apiculate; collum shorter than but 

 occasionally equaling the sporangium; calyptra smooth, deeply lobed, half 

 covering the capsule; spores small, brown, angled and pitted. Bull. Torr. 

 Bot. Club 21: 361. 1894. Growing around quartz pebbles in sandy soil: 

 Maryland; North Carolina. 



40. Bruchia Carolin* Aust. Plants gregarious, in brown patches, 

 1-2 mm. high: stems naked and radiculose at base, leaves crowded at the 

 summit, more or less secund, subulate from a broader base; costa chan- 

 neled, filling the entire or serrulate apex, faintly papillose on the back; 

 basal cells smooth, irregular, upper with thickened walls: seta shorter 

 than the capsule, both immersed, or the capsule occasionally exserted later- 

 ally, pyriform, yellow or brown, conic apiculate; collum large, truncate, 

 stomata immersed; calyptra broad, lobed, papillose at the apex; spores 

 small, pitted: flowers monoicous. Bull. Torr. Bot. Club 21: 365. 1894. 

 Bruchia Ravenelii Wils., var. mollis, L. & J. Man. 49. South Carolina. 



41. Astoinum Drummondii Kindb. Plants cespitose, almost stem- 

 less: leaves linear subulate, very entire: seta as long as leaves: capsule 

 globose, lid conic rostrate. Mac. Cat. 12. Plains of the Saskatchewan. 



42. Voitia Hsch. Tufts thick, densely cespitose, below brown tomen- 

 tose: stems simple or dichotomously branched: leaves somewhat separated, 

 or densely imbricate, long or short, ovate or elongated elliptical, cuspidate; 

 costa thin and weak; cells large, thin-walled, hexagonal or sub-quadrate, 



