CATALOGUE. 343 



Hab. — Twin Lakes, on damp rocks ; not common. 



Desmatodon Laureri, var. ovalis. — A smaller plant, with broader 

 leaves and larger, oval, nodding capsule, on a much shorter, upright, and 

 slightly flexuose pedicel 



Hab. — Twin Lakes, on shaded ground. 



Barbula mucronifolia, Schwoeg. 



Hal). — Twin Lakes, on rocks ; also a variety with a short mucro, simi- 

 lar to a variety of B. subidata, Brid. 



Barbula ruralis, Hedw. 



Hab. — Twin Lakes, on rocks ; common. 



Grimmia apocarpa, Hedw. 



Hab. — Twin Lakes, on rocks ; common. 



Grimmia platyphylla, Mitt. — Distinguished from the above by its 

 leaves being obtuse and more than twice as wide, imbricated when dry ; 

 the younger leaves terminating with a very short diaphanous apiculus ; the 

 perichpetial leaves very laxly areolate for two-thirds of their length; the 

 capsule large and immersed. 



Hab. — Twin Lakes, on rocks ; rare. 



Grimmia anodon, Brch. & Schp. — An interesting species, recognized 

 by its small hoary cushions of dark green at the surface, leaves ending in 

 a long hairy point, and the oval, gymnostomous, immersed capsule strongly 

 ventricose. 



Hab. — Twin Lakes, on dry rocks ; not common. 



Grimmia ovata, Web. & Mohr. 



Hab. — Twin Lakes, on exposed rocks on mountain sides. 



Grimmia ovata, var. ft. affinis, Brch. & Sch. 



Hab. — In like situations. 



Grimmia calyptrata, Hooker. — In dense cushions ; stem branched ; 

 the upper erect leaves ending with a long, slender, piliferous point, the 

 cylindrical capsule covered with the large calyptra when mature. 



Hab. — Twin Lakes, on dry rocks ; not common. 



Hedwigia ciliata, var. leucoph^ea, Brch. & Schp. — This variety is 

 known by its ciliated, long, diaphanous points to the leaves. 



Orthotrichum tenellum, Bruch. — In small cushions, with short, 



