CATALOGUE. 349 



Hypnum. commutatum, Hedw. 



Hab. — Twin Lakes, in wet, places. 



Hypnum commutatum, var. /?. falcatum, B. & S. 



Hab. — Twin Lakes, in similar situations. 



Hypnum reptile, Michx. 



Hab. — Mt. Graham, Arizona, on old rotten pine logs. 



Steeeodon plicatilis, Mitten. — Dioicous, fastigiately branched ; leaves 

 falcate, secund, broad, ovate-acuminate, when dry rugulose-subplicate, two 

 very short nerves ; margin reflexed, entire, on those of the branches serrulate 

 at the points, the cells at the angles small and obscure ; perichsetial leaves 

 erect, elongated, interior broad, oblong-lanceolate, subulate, entire, plicate. 

 Capsule on an elongate pedicel, cylindrical, erect at the base, curved above ; 

 operculum conic ; peristome light color. 



Hab. — Twin Lakes, on old logs. 



Stereodon complexus, Mitten. — Dioicous, csespitose; branches pinnate; 

 leaves secund from a broad base, ovate-lanceolate, circulate, concave, two 

 small nerves ; margin subentire, many short, obscure, subquadrate cells at 

 the basal angles ; perichsetial leaves erect, oblong, subulate, interior sud- 

 denly subulate, subserrate, plicate ; capsule on a red pedicel, cylindrical, 

 unequal, inclined ; persistome yellow ; operculum conic. 



Hab. — Twin Lakes, on shaded rocks. 



Limnobium palustre, Linn. 



Hab. — Twin Lakes, at the base of trees at the water's edge. 



Limnobium palustre, var. subjulaceum. 



Hab — Twin Lakes, in like situations. 



Limnobium ochraceum. — Turn. 



Hah. — Twin Lakes, on wet ground. 



Camptothecium nitens, Schreb. 



Hab. — Twin Lakes, among grass in meadows. 



