54 BRYACE^, [Gymnostomum. 



Hab. Surface and fissures of damp or shaded overhanging rocks, in the 

 mountains especially, not rare. The variety on calcareous rocks, Dallas 

 County, Texas (E. Hall). 



This and the next species are extremely variable, and some of the varie- 

 ties are indifferently referable to one or the other. Var. stelUgeriun, which 

 represents G. stelligerum and G. articiilatum, Smith, and G. pomiferum, 

 Nees & Hornsch., is considered by Wilson and others as a variety of 

 G. ciirnirostrinn. It is apparently from sterile plants of one of the 

 numerous varieties of tliis species that G. Clintoni, Aust. (Bull. Torr. 

 Club, vi. 42), has been made. 



3. G. curvirostrum, Iledw. Plants dark red or brown, 

 soft or solid, 1 to 10 cent, long, with close fastigiate branches 

 more or less covered with a reddish felt of radicles : leaves 

 spreading, slightly incurved when dry, lanceolate-acute, concave 

 at the hyaline base, carinate above, smooth or slightly papillose, 

 with borders entire or sometimes slightly serrate and recurved 

 above the base ; costa vanishing under the apex : capsule long- 

 pedicellate, ovate, oblong or sub-globose, thick-walled, chestnut- 

 color, shining, turbinate when dry and empty ; lid enlarged and 

 conical at base, prolonged into a long oblique tubular beak re- 

 maining attached to the columella and persisting long after dis- 

 ruption from the orifice of the capsule ; annulus of a double i-ow 

 of small persistent cells : spores larger than in the preceding, — 

 Stirp. Crypt, ii. 68, t. 24 ; Bryol. Eur. t. 35 and 36. Pottia 

 curvirostris, Ehrh. 



Hab. Limestone rocks, and on deposits of carbonate of lime or tufa, 

 near springs; very abundant at Niagara Falls. 



4. G. tenue, Schrader. Plants very small, 1 m.ra. high, 

 widely subcespitose : leaves linear, gradually narrower to the 

 obtuse apex, concave ; pericha3tial leaves sheathing to the 

 middle, there recurved, thinly costate, the inner ecostate and 

 smaller : capsule oblong-elliptical ; lid short-beaked ; annulus 

 broad ; peristome mostly none or composed of minute narrow 

 teeth. — Coll. PL Crypt, n. 31 ; Bryol. Eur. t. 30. Gyroioeisia 

 tenuis^ Schimp. Syn. 2 ed., 38. Weisia temois, Muell. 



Hab. On limestone rocks. Lake Winnipeg (JDritmmond). 



12. ANCECTANGIUM, Schwaegr. (in part). 

 Plants compactedly pulvinate-cespitose, with dichotomous 

 and fastigiate branches, radiculose their whole length. Leaves 

 spreadmg, lanceolate or linear-lanceolate, subulate, opaque, 



