Gymnostomum.] BRYACE^. 53 



ulate by a solid costa, prominent on the back ; areolation 

 minute, quadrate in the upjDer part. Flowers dioecious in the 

 American species. Capsule symmetrical ; lid long-beaked. 



1. G. calcareum, Nees & Hornsch. Plants densely tufted, 

 green above, ferruginous below ; stems radiculose : lower leaves 

 very small, gradually or abruptly larger upward, linear-lanceo- 

 late, costate to near the blunt aj^ex, concave, borders minutely 

 crenulate ; lower perichffitial leaves sheathing, the upper spread- 

 ing, very concave, lanceolate-acute : capsule exserted on a com- 

 paratively long pedicel, oblong, yellowish brown, truncate* or 

 slightly constricted under the orifice when dry ; annulus short, 

 persistent ; lid subulate-rostrate from a conical base. — Bryol. 

 Germ. 153, t. 10 ; Bryol. Eur. t. 32. Trichostoniunx calcareum^ 

 Lindb. Trichost. 19. 



Var. brevifolium, Schunp. Plants slender and delicate : 

 lower leaves distant, very small, scarcely perceivable to the 

 naked eye, the upper close and tufted, oblong-lanceolate, recurved 

 from the middle, acute or blunt at the apex: capsule small, 

 ovate or sub-globose. — G. viridulum, Bryol. Eur. t. 31. 



Var. perpusillum, Sulliv. Very small. Leaves erect, ovate- 

 lanceolate: capsule 2)yriform-oval. — Pacif. R. Rejx iv. 185. 



Hab. On slate rocks, near Little Falls, New York (Austin)^ the first 

 variety near Belleville, Canada West {Macoun), the second on clayey soil 

 near San Francisco, California (Bigelow). 



2. G. rupestre, Schwaegr. More or less densely tufted : 

 stems 1 to 5 cent, long, slender, with dichotomous or fasciculate 

 divisions : leaves gradually increasing in size from the base to 

 the top, spreading or recurved, linear-lanceolate, blunt at apex, 

 minutely papillose on the back or smooth, costate to below the 

 apex ; perichaetial leaves enlarged at base, somewhat sheathing : 

 capsule ovate-oblong, rarely sub-globose, thin-walled, pale 

 yellow or reddish brown, shining, truncate when empty ; pedicel 

 reddish ; lid conical-acimiinate or short-beaked ; annulus none. 



— Suppl. I., part 1, 31, t. xi. ; Bryol. Eur. t. 33, 34. Trichosto- 

 muni ceruginosum, Lindb. Trichost. 19. 



Var. stelligerum, Schimp. Loosely cespitose, more robust : 

 leaves longer, incurved when dry : capsule pale, reddish at the 

 orifice ; lid obliquely rostrate. Closely resembles the following. 



— G. tophaceum, Austin, Bull. Ton*. Club. vi. 42. 



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