234 BRYACE^. [Bryum. 



Hab. On moist rocks, Tosemite Valley (Bolander). 



With the appearance of B. pseudo-triqnetrum, with which it grows 

 mixed, but easily separated by the given characters. It has the ramifi- 

 catiun of B. Biyelovii, Sulliv,, from which it differs in its longer capsule 

 and the form of the leaves. The purplish branches are often abruptly 

 crimsoned at tlie apex, as if painted with carmine. 



28. B. AtwateriSB, Muell. Closely related to the last, 

 from which it essentially differs in its somewhat more robust 

 stems, the leaves more densely imbricate, scarcely open when 

 moistened, oblong or ovate, obtuse, more distinctly narrowed 

 toward the base, cucuUate, with tlie borders revolute from the 

 base to the middle, and with a thick yellow medial nerve, the 

 areolation more comjiact, the upper cells smaller, less distant, 

 pellucid, narrowly oblong and angular, the lower moi-e distinct, 

 rectangular along the borders, hexagonal toward the middle : 

 the oblong pendent capsule, slightly contracted under the lid 

 when dry, has the same color and form. — Regensb. Flora, Iviii. 

 76 (1873). j5. Jlacoimii, Aust. in Coult. Bot. Gaz. ii. 110. 



Hab. Rocks near waterfalls; Yosemite Valley, California {Mrs. 

 Atwater), sterile; Oregon (U. Hall), fruiting plants; British Columbia 

 (Ma conn). 



It is very difficult to find marked and persistent characters separating 

 this from the last species. The Californian plants are long and still more 

 slender than those of B. miniatuin. The fruiting specimens from 

 Oregon are strong, thick, and very short, while the sterile from British 

 America (described as B. Macounii) are as long as those of B. miniatum, 

 and also much thicker. The leaves, differing enough in appearance when 

 single specimens are compared, taken altogether have the same char- 

 acters. In his description of B. Macounii, Austin states that the leaves 

 have the borders flat, while in B. miniatum they are revolute. This last 

 character is distinct in B. Ahvaterioi, as described by Mueller, and most 

 of the leaves of B. Macounii also have the borders of the leaves as dis- 

 tinctly reflexed or revolute towards the base as in B. miniatum. The 

 leaves in all these forms are more or less indistinctly margined. Austin 

 also remarks that B. miniatum is too near B. Muhlenbeckii, but the 

 Macoun specimens are far more closely allied to this last species in their 

 strong growth than are the slender stems of B. miniatum. 



29. B. argenteum, Linn. Plants more or less densely 

 tufted and irregularly cespitose, greenish or silver white; stems 

 short, radiculose, with numerous julaceous innovations : stem- 

 and branch-leaves broadly ovate or obovate, deeply concave, 

 abruptly apiculate, the comal oblong-lanceolate, acuminate ; 

 costa vanishing above the middle ; borders entire, plane ; areo- 

 lation loose : capsule pendent, oblong, constricted under the 



