(128) 



pointed, more entire, and costa more frequently vanishing 

 just below point (584). 



Collected in good fruit July 17, 1899, at Dawson, also at 

 the mouth of the little Salmon River. The plants form ex- 

 tensive mats, often many feet across, in low, wet places. 



Bryum suborbiculare Philibert, sp. nov. 



Apparently dioicous, no male flowers found. Tufts up to 

 2. 1 , cm. high. Stems seldom branching. Leaves in 3 or 4 

 rosettes with innovations starting from their bases. Outer 

 perichaetial leaves oblong, somewhat acutely pointed, 2 mm. 

 long, upper stem leaves a little shorter, very broadly ovate, 

 often obtuse, all entire with costa percurrent or mostly so. 

 Borders revolute below and of about 3 rows of elongated 

 cells, toward apex becoming flat and cells scarcely elongated. 

 Lower leaves small, obtuse, often nearly as broad as long, 

 with costa vanishing. Inner perichaetial leaves very broadly 

 ovate-lanceolate, small, with costa vanishing. Median leaf- 

 cells rhomboidal to hexagonal, from scarcely elongated to 

 twice longer than broad, up to .025 mm. long. Cell walls 

 not pitted. Capsule with lid up to 3 mm. long, broadly obo- 

 vate, the sporangium gradually narrowing to a very short 

 collum. Lid low-convex, papillate. Seta up to 2^- cm. 

 high. Exostome with lower dorsal plates narrow (1-3) and 

 25-30 lamellae on inner face. Endostome free with basilar 

 membrane extending over ^ up, the segments slender above 

 and widely perforate with mostly 3 long, finely appendicu- 

 late cilia between. Annulus of 3 rows of cells. Exothecal 

 cells about mouth of capsule transversely elongated, in 2 or 

 3 rows, near middle the cells about twice longer than wide, 

 toward base irregular, sinuous walled, with stomata about 

 .035 mm. long. Spores nearly or quite smooth, up to .016 

 mm. (Plate 20.) 



This small moss is peculiar in having the broad, mostly 

 obtuse leaves clustered in 3 or 4 rosettes along the stem. It 

 does not seem to be related very closely to any other Ameri- 

 can species. 



Dawson, growing in swamp with Cinclidium and appar- 

 ently rare. Collected in good fruit, July 2, 1899 (577)- 



Plagiobryum Zierii (Dicks.) Lindb. {Zieria julacea 

 Schimp.) A few sterile specimens collected on earth in 

 crevices of rock about 1000 ft. above Lake Lindeman (660). 



