78 NORTH AMERICAN FLORA [Vorumy 15 
Alar cells not or very slightly differentiated. 
Upper part of leaf-blade of one thickness of cells. 6. SYMBLEPHARIS, 
Upper part and border of leaf-blade of a double thickness of 
cells. 7. AUSTINELLA. 
Alar cells differentiated. 
Leaves with a hyaline border. 10. LeucoOLOMA. 
Leaves without a hyaline border. 
Peristome-teeth inserted well below the rim of the capsule, 
papillose. th f 8. HoLoMItRIUM. 
Peristome-teeth inserted close to the rim of the capsule, 
mostly striate. 11. Dicranum. 
Capsule without stomata; seta often strongly curved, geniculate, or 
cygneous when moist; costa usually broad. 
Costa without stereid-bands. 
Upper and lower surfaces of the costa of large, empty, and thin- 
walled cells. 12. BROTHERA. 
Upper surface only of the costa of large, empty, and thin-walled 
cells. 13. CamMpyLoPus. 
Costa with stereid-bands. 
Peristome-teeth regularly 2-forked. 
Peristome-teeth divided about half way down, with a distinct 
median line below; calyptra mostly fimbriate at the base. 13. CampyLorus. 
Peristome-teeth divided three fourths down or more, the 
forks slender; calyptra not fimbriate. 16. DIcRANODONTIUM. 
Peristome-teeth long and narrow, sometimes only faintly striate, = 
not forked, or some of the teeth irregularly divided. 
Capsule elliptic, with an annulus. 14, ‘THysaANoMITRIUM. 
Capsule cylindric, without an annulus. 15. PrLopocon. 
III. RuaspowEIsieakb 
Capsule 8-ribbed; leaves scarcely or not mamillose. 17, RHABDOWEISIA. 
Capsule not ribbed; leaves mamillose. 
Capsule regular, erect; peristome-teeth mostly undivided, nearly 
smooth on the outer face, or faintly and more or less obliquely striate. 18. OREOWEISIA. 
Capsule irregular and nodding to nearly regular and erect; peristome- 
teeth divided about half way down, papillose and vertically striate. 19, DicHODONTIUM. 
1. ANGSTROEMIA B.S.G. Bryol. Eur, (33-36:) Ang. 1. 1846. 
Dioicous: male plants with flowers conspicuous, terminal or becoming lateral by inno- 
vations from just below the perigonial leaves; antheridia large and numerous. Plants gre- 
garious or in loose, golden- or greenish-brown tufts with simple or somewhat branching stems 
up to 6 cm. high. Leaves smooth, nearly or quite entire, the.lower ones small with a 
short point, the upper larger, from ovate or obovate to ovate-lanceolate, more or less abruptly 
narrowed to the erect or sometimes abruptly spreading-incurved, elongate point; lower leaf- 
cells elongate with mostly pale, thin walls, the alar not differentiated, the upper mostly long 
and narrow, except in A. vaginatum, which has rather short, often nearly square cells, with 
some transversely elongate cells at the shoulder of the leaf. Seta erect, smooth, elongate. 
Capsule symmetric, erect, oval to cylindric, smooth, mostly without annulus; peristome 
inserted just below the mouth or sometimes lacking, the teeth reddish-brown, lanceolate, 
entire or more or less divided into 2 forks, and somewhat vertically striate or papillose; lid 
somewhat persistent, conic, mostly long-beaked, falling with the upper part of the columella. 
Calyptra cucullate, smooth, entire at the base. 
Type species, Weista longipes Sommerf. 
Leaf-cells all elongate; leaf-point erect. 
Capsule about 0.6 mm. high: seta 10-12 mm. long. 1. A. longipes. 
Capsule up to 2 mm. high; seta 3-5 mm. long. 2. A. jamaicensis. 
Leaf-cells at shoulder of leaf transversely elongate, in upper part of leaf often 
nearly square; leaf-point abruptly spreading-incurved. 3. A. vaginata. 
1. Angstroemia longipes (Sommerf.) B.S.G. Bryol. Eur. (33-36 :) 
Ang. 3. 1846. 
Weisia longipes Sommerf. Suppl. Fl. Lapp, 52. 1826. 
Dicranum julaceum Hook. in Drummond, Musci Am. 100. 1828. 
Dioicous: male flowers subdiscoid, the inner perigonial leaves shorter thar the outer, 
reddish-brown, ovate, concave, acutely pointed, entire, costate to a little below the apex, 
