— lOI — 



part, the outer perichaetial leaves extending to or above the tips of the inner 

 Upper leaves up to 2 mm. long, deeply channeled and crenulate-papillose on 

 the margin above, lower leaves i mm. or less, all with flat borders and costa 

 vanishing below the apex. Leaf -cells distinct, roundish above, .006-. 008 mm. 

 in diameter with i or 2 papillae to each cell. Lower cells hyaline, somewhat 

 irregular, 2-4 times longer than wide. Capsule ovate-oblong, with lid up to 

 lYz mm. long, the lid often nearly as long as the capsule. Annulus large, of 

 3 rows of cells. The twisted papillose teeth form a solid basal membrane 

 about Yd the height of the teeth. Mouth of^capsule with 5 or 6 rows of small 

 roundish cells with groups of 4 or 5 twice larger cells interspersed here and 

 there. Smooth spores up to about .008 mm. 



This species is near convoluta, but may be distinguished at once by the 

 perichaetium. In cojivoluta the sheathing leaves project one-half or more 

 above the tips of the next surrounding leaves and are mostly truncate-crenu- 

 late or with a very short point. On earth, June 18, 1894, Columbia Falls 

 (292). Also collected by J. B. Leiberg, Traille River Basin, Idaho (190). 



Pohlia atropurpura (Wahlenb.) Lindb. fil. Columbia Falls, on wet 

 gravel about springs. May. I am indebted to Harald Lindberg, fll., for the 

 determination of this species. It is dioicous, exanulate, teeth of peristome 

 dark ferruginous, stomata superficial, leaves not or scarcely decurrent, seta 

 large and fleshy above while growing. The leaves are narrower and less 

 serrate than in carnea which has light colored teeth. Not before credited to 

 America, 1 believe (297). 



Pohlia vexans (Limpr.) Lindb. fil. Tenderfoot Cr., on Belt Mts., on 

 rocks, Oct. Also determined by Harald Lindberg. It is certainly near 

 pulchella. which according to Lindberg, has a well differentiated annulus. 

 P. vexans is supposed to have no annulus but my specimens show a ten- 

 dency to produce an annulus (in the well-developed capsules) of i or 2 rows, 

 slightly smaller, but otherwise scarcely different cells that mostly remain 

 attached to the lid, breaking away in small fragments. This is about like 

 the annulus described for pulchella in Lesq. & James' Manual. The Mon- 

 tana plant is dioicous, with decurrent leaves, costa red at base and broad, 

 ^ the width of leaf base with leaf-cells long and narrow above, often 1-6 (145). 



Bryum Williamsi Philibert, Rev. Bryol. 28:31, 1900. (Plate 38). Dioi- 

 cous. In compact tufts felted with radicles below and up to 3 cm. high. 

 Stems somewhat branching, rather uniformly leaved above. Leaves erect, 

 imbricated both wet and dry, broadly ovate-lanceolate, entire or minutely 

 serrulate at apex, up to 2 mm. long, flat on borders or recurved along the 

 middle, with 2 or 3 rows of narrow, elongated cells forming a distinct mar- 

 gin. Stout red costa, .080 mm. wide at base, percurrent or ending i or 2 

 cells below apex. Leaf -cells rather elongated rhomboidal to rectangular, 

 median, .050-060 mm. long and .oi6-oj8 mm. wide, all with thickened but 

 not pitted walls. Capsule elongated-pyriform, not contracted below the 

 small mouth, up to 4 mm. long, with distinct-collum equalling sporangium 

 in length. Lid rather low^-convex mamillate. Annulus large. Teeth some- 

 what papillose, w4th narrow border, the outer plates below ly^-iYi times 



