CATALOGUE OF CANADIAN PLANTS. 255 



RCELLIA, Kindb., Revue Bryol., 1896. 



521. R. simplex, KINDB. 



Bryum simplex, Kindb., Cat. Can. Musci, p. 135. 



Very abundant on the upper slopes of Mount Benson near 

 Nanaimo, Vancouver Island, July loth, 1893. (Macoun.) 



78. ZIERIA, Schimp. 



526. z. julacea, SCHIMP. 



Plagiobryum Zierii, (Dicks.) Lindb. 



A few sterile specimens collected on earth in crevices of rock 

 about 1000 feet above Lake Lindeman, Yukon. (Williams.?) 



1089. Z. argenteoides, (WILLIAMS.) 



Plagiobryum argenteoides, R. S. Williams ; Bull. New York, 

 Bot. Gar. Vol. II., p. 129. 



With the appearance of Bryutn argenteum. In dense tufts up 

 to i cm. high. Stems simple or branching, vineous red, radiculose 

 below, in cross-section showing an outer wall of one layer of 

 irregular, somewhat thick-walled cells, with ground tissue of very 

 large, thin-walled cells, becoming smaller toward center and 

 enclosing a distinct central strand. Leaves concave, appressed, 

 broadly ovate, with short abrupt point, entire, mostly ^ mm. 

 long or less or occasionally the terminal leaves lanceolate pointed 

 and up to I mm. long. Costa vanishing from i to f up. Upper 

 of leaf usually hyaline. Alar cells and most basal cells square 

 (sides 12 to 16 mm.) to short rectangular (i to 2.) Median cells 

 irregularly rhomboidal to oblong-linear, up to '040 or '050 mm. 

 Cell walls somewhat thickened, especially above. 



Found on bare rock in dry places on the Yukon River, just 

 below Dawson, Yukon, March I9th, 1899. (Williams?) 



79. MNIUM, Linn. 

 529. M. venustum. MITT. 



Growing in company with M. insigne, in the Chilliwack Valley, 

 B.C., 1901. (/. M. Macoun.) 



