(I2 4 ) 



Europea as representing the type of B. Brozvnii, it would 

 seem that the only differences by which this is to be distin- 

 guished from 'pendulum (B. cernuuni), Plate 331, are the 

 better developed cilia and the thin, not pitted leaf-cells. We 

 have lately received from M. Philibert a specimen collected 

 in Norway and regarded by him as true Brozvnii. This 

 shows teeth with about 23 lamellae joined by very thin cross 

 walls, the outer plates toward base \\ to 2.! times wider than 

 high and 2 or 3 cilia, not appendiculate and irregular, some 

 of them nearly as long as the segments. Roughened spores 

 up to about .030 mm. Flowers antoicous, $ and 9 very 

 similar, but the first rather larger. The leaf-cells are thin- 

 walled, the lower being longer in proportion to width (from 3 

 to 6 to 1) than in -pendulum, in which they are nearly square, 

 often, in basal angles. The stem leaves are nearly all worn 

 away and imperfect ; a few, however, show points nearly as 

 long as Schimper's figure. In any case my Dawson speci- 

 mens must be referred to pendulum and the others men- 

 tioned above, exxept the one from Norway, are not Brozvnii, 

 nor is Drummond's no. 265, so there seems to be no known 

 American specimens at present. 



Br yum pendulum (Hornsch.) Schimp. Dawson, in fine 

 fruit July 30. Inflorescence, teeth, etc., as given for the pre- 

 ceding Dawson specimens (582). 



Bryum Dawsonense R. S. Williams, sp. nov. 



Synoicous and autoicous. Tufts low, 1.5 cm. high, and 

 dense. Stems branching. Outer perichaetial leaves ovate- 

 lanceolate, upper stem leaves ovate, about 2.5 mm. long with 

 costa excurrent the length of 2 or 3 short cells. Lower stem 

 leaves much smaller and costa not quite percurrent. Leaves 

 entire, or sometimes minutely serrulate towards apex with 

 revolute margins from base to near apex or in very young 

 or lower leaves margins scarcely revolute. Marginal cells 

 .! down in upper leaves narrowed and much elongated in 

 3 or 4 rows but only slightly changed toward apex. Inner 

 perichaetial leaves small, lanceolate pointed, with percurrent 

 costa. Median leaf-cells rhomboidal to hexagonal, mostly 

 2 or 3 times longer than broad, about .050 mm. long. Lower 



