(i3i) 



They correspond well with the description and figures in the 

 Bryologia Europaea and my specimens from the Yukon are 

 the same. The species may be distinguished from hymeno- 

 fhylloides by the more decurrent leaves, with more rounded 

 apex and by the much shorter, wider cells in margin on 

 either side just below the apex. The first 2 or 3 cells on 

 either side of apical cell of leaf are scarcely elongated, the 

 next 2 or 3 are rhomboidal, 2 or 3 times longer than wide, 

 the width being .020 to .025 mm. In hymenofhylloides the 

 second or third cell in margin below the apical cell is about 

 .010 mm. wide and 6 to 10 times longer than wide (673). 



Cinclidtum sty gium Swartz. Dawson. Common in swampy 

 places. In fine fruit July 9. The clear, rich red border 

 of the leaves at once distinguishes this plant from any Mnium. 

 The margins are mostly flat and of a single layer of thick- 

 walled cells. The leaf-cells are obliquely elongated, some- 

 what in rows, the inner median up to .050 mm. long. Cell 

 walls more or less thickened and pitted (671). 



Cinclidtum subrotundum Lindb. Head of Lake Bennett 

 about springs. Tufts up to 9 cm. high. The leaves are very 

 similar to the preceding but have a double layer of cells in 

 the border (672). 



Aulacomnium -palustre (L.) Schwaegr. Mouth of the 

 Little Salmon River. Fruiting, June 16 (675). 



Aulacomnium ^palustre imbricalum B. & S. Dawson, very 

 common in wet places. Plants about the size of turgidum 

 (676). 



Aulacomnium turgidum (Wahl.) Schwaegr. Sheep Camp, 

 Dyea Creek, sterile. Dawson, very abundant, fruiting (677). 



Timmia cucullata Michx. Yukon River just above Dawson. 

 Growing at the base of trees. This species is quite distinct 

 from megaftolitana. It occurs in Montana and appears to be 

 the commonest species of the genus in the eastern United 

 States. It differs from megapolitana in the wider mouthed 

 capsule, more curved and smooth when dry, the exothecal 

 cells, also, are elongated and not sinuous walled, the stomata 

 roundish, about .048 mm. in diameter, sometimes even 



