-84- 



Distinct from B. acumiiiatiwt Ren. and Card, by its habit, its more 

 abruptly acuminate leaves, etc. It more closely resembles B. albicans Br. 

 Eur. , from which it differs by its shorter and more abruptly acuminate leaves, 

 its quadrate, more numerous alar cells, its more chlorophyllose areolation, 

 and by its narrower, short and often bifurcate costa. 

 Plagiothecium fallax Card, and Ther. 



Dioicous, robust, yellowish-green, glossy. Stem prostrate or decumbent, 

 5-8 cm. long, flexuous, sparingly branched, often radiculose at the attenuate 

 apex. Leaves loosely complanate-distichous, subundulate-crispulate when 

 dry, 2. 5- mm. long, 1-1.3 broad, not at all decurrent at base, oblong-lanceolate 

 asymmetric, broadly short-acuminate, plicate, margins plane, entire, costa 

 double, unequal, the longer branch extending one-third to one-half the 

 length of leaf; basal cells few quadrate or short-rectangular, the others 

 linear 125-225/^ long, g-14 broad: Other characters unknown, 



From Douglas Island (Trelease, 1743 in part). 



Resembling in habit the species of the denticulatum group, but very 

 distinct by its leaves being not decurrent. 

 Amblystegium serpens Beringianum Card, and Ther. 



Differs from the typical form in the broader ovate-lanceolate leaves with 

 shorter acumen, in the stronger costa extending to the base of the acumen, 

 and in the rectangular basal cells with incrassate walls. 



From St. Paul Island (Trelease, 2089 in part). 



Under number 1760 we found some stems of a stouter species much 

 resembling A. radicale (P. Beauv.) Mitt. 

 Amblystegium varium Alaskanum Card and Ther. 



Very robust, densely branched in broad depressed tufts, leaves very 

 short, broadly ovate, constricted below, shortly and narrowly acuminate, 

 alar cells much larger, inflated. 



From Muir Glacier (Trelease, 1752). 

 Hypnum Treleasei Ren. 



Densely csespitose, fragile, yellowish-green. Stem short, 2-3 cm. high, 

 erect, radiculose below, branches erect, fastigiate. Leaves crowded, small, 

 subimbricate, sometimes subhomomallous, 1.2 mm. long, 0.6 broad, ovate- 

 lanceolate, rather short-acuminate, scarcely plicate generally suddenly nar- 

 rowed, minutely denticulate, costa double, short basal cells quadrate or 

 short-rectangular, chlorophyllose, the outer cells elongated, decurrent, the 

 rest linear, 30-40/1 long, 6-7 broad. Other characters unknown. 



From Virgin Bay (Trelease, 2305); St. Matthew Island (Trelease, 2158, 

 2165). 



The description here given, as also the drawing, is based on the St. 

 Matthew Island specimens. The Virgin Bay specimen has the leaves longer, 

 with a more elongated and narrower acumen and a closer areolation, formed of 

 longer and narrower cells. This is, however, no doubt of the specific identity 

 of the two specimens. This species should be placed near H. stellatum 

 Schreb., from which it is distinguished by its much smaller dimensions, its 

 short and fastigiate stems, its leaves which are small, imbricate, shortly 



