136 BRYACEyE. [Grimmia. 



3. G. apocarpa, Hedw. More robust and not as densely 

 tufted as the preceding : leaves oj^en from an erect base 

 when moist, lanceolate from the enlarged concave base, carinate 

 above, recurved on the borders, often hyaline-denticulate at the 

 aj^ex ; costa vanishing below the apex or excurrent into a rough 

 pellucid point : capsule ovate, thick ; lid jiurple with a longer 

 acuminate beak; peristome dark purple, Avith broader nearly 

 entire scarcely perforate teeth ; annulus none. — Muse. Frond, 

 i. 113, t. 39. JBri/um apocarpum^ Linn. Sp. PL 1115. Schisti- 

 dium apocarpum^ Bruch & Schimp. Bryol. Eur. t. 233, 234 ; 

 Sulliv. Mosses of U. States, 36. 



Var. gracilis, Nees & Hornsch. Stems longer, slender: 

 leaves spreading all around or inclined to one side : fruits 

 lateral by ^prolongation of the innovations. 



Var. rivularis, Nees & Hornsch. Loosely cespitose, fasci- 

 culate-branching, blackish green : leaves ovate-lanceolate, blunt 

 at the a2)ex : capsule turbinate and wide-mouthed when empty. 



Hab. On stone, rocks, walls, etc., rarely on wood; the first variety on 

 dry rocks in mountains; the second common on rocks in streams. 



4. G. platyphylla, Mitt. Leaves incurved and imbricate, 

 broadly ovate, blunt at the apex or produced into a short 

 diaphanous point by the percurrent thick costa, revolute on the 

 borders ; perichoetial leaves broadly oval, oblong, angular, 

 obtuse at the apex, loosely areolate, with long delicate meshes 

 to near the apex. — Journ. Linn. Soc. viii. 20. 



Hab. Davis Straits (Taylor). 



This species, says the author, is in appearance like G. apocarpa, var. 

 strlcta, but the leaves are more than twice as wide and imbricated both 

 in the Avet and dry state, the perichtetial with very lax areolation for two- 

 thirds of their length. 



5. G. Agassizii. Stems short; branches fasciculate at the 

 apex : leaves appressed when dry, erect when moist and shining, 

 blackish, linear-lanceolate from a slightly broader base, obtuse 

 and coarsely sparingly dentate at the aj^ex ; costa vanishing 

 below the apex ; perichsetial leaves longer and obtuse : capsule 

 oblong ; beak of the lid short and obtuse ; teeth dark red, thick 

 and entire below, pale and cribi'ose above. — ScJdstidiimi 

 Agassizii, Sulliv. & Lesq. Muse. Bor.-Am. Exsicc. n. 137 ; 

 Sulliv. Mosses of U. States, 104. 



Hab. Rocks washed by the waves; Lake Superior (L. Agassiz, 1848). 

 Closely allied to G. maritima, from which it differs in the longer nar- 



