-13- 



or less regularly pinnate, particularly near the ends; branches 

 7-i2mm. long; branch leaves equally spreading, strongly plicate, 

 both moist and dry, ovate, not decurrent, 1.5-1. 75 X o.45-o-7omm., 

 broadest a little above the base and thence gradually narrowed 

 to a long narrow apex, more strongly serrate above than in 

 B. lamprochryseum ; costa extending from one-half to two- 

 thirds the entire length of the leaf; median cells linear-vermicular 

 0.080-0. 125mm. in length; 10-16:1 ; basal cells shorter and broader, 

 extreme alar sometimes inflated and vesicular with a single row 

 of much enlarged rectangular cells along the base ( These fre- 

 quently fail to be detached with the leaf ) ; stem leaves of lower 

 stems slenderly deltoid-ovate, auricled and decurrent (The auricles 

 are often made more distinct by strong plica? near the margin, as 

 in Cliinacium Americanum), 2-2. smm. long and about one half 

 as wide at the widest portion of the base; median and basal cells 

 as in the branch leaves; auricular cells rectangular to hexagono- 

 rhomboidal, the lower somewhat inflated and vesicular. Dioicous 

 apparently; no male buds found; perichtetial leaves sheathing 

 with long squarror.e filiform apices, entire or distantly dentate 

 above, ecostate or rarely with traces of a costa. 



Sporophyte 3-4cm- high; seta red, becoming red-brown when 

 old, very rough, very little or not at all twisted ; capsule oblong- 

 cylindric, arcuate and inclined, to nearly horizontal, with oper- 

 culum about 3. smm. long, about 4:1 ; somewhat contracted under 

 the mouth when dry; operculum conic and ro-^trate with a shining 

 black, needle-like beak, about one-third the height of the entire 

 operculum; annulus inconspicuous, of a single row of cells; teeth 

 red; segments slender, widely open along the keel, from a basal 

 membrane about one-half their height; cilia two or three, well 

 developed but shorter than the .segments, nodose or slightly ap- 

 pendiculate; spores about 0.013'nin,, shrunken and apparently 

 immature on date of collection, November 23, iSqo 



Type locality, moist banks. Mason county, Washington. 



G. V. Piper, No. 25, Nov. 23, 1S90. 



Type in Eaton Herbarium at Yale. Co-type in Herbarium of 

 Columbia University. 



Closely related to B. aspe?r/iuuin and B. lamprochryseum, 

 differing from both in its almost regularly pinnate branching and 

 auriculate stem leaves; also from the former in the narrower, more 

 strongly plicate stem leaves, branch leaves not decurrent, and in 

 the longer, more slender, and more arcuate capsule. From the 

 latter it also differs in the more slender habit and narrower, less 

 plicate stem leaves. B. asperrimum and B. Washingtontanum 

 are characterized by an operculum abruptly rostrate when dry 

 with a slender black shining beak, the operculum itself being 

 some shade of brown. This is well illustrated in Sullivant's 

 figures of .5. asperrimum. Icones Muse. Suppl, //. 76. When 

 moist this operculum becomes long conic and rostrate, as shown 

 in the plate. Taken by itself, this species might be referred to 



