Mosses 5 E 



rectangularibus, pellucidis, superioribus subincrassatis, depresso-rotundatis; 

 nervo excurrente (0-4 — 0-5 mm.), crasso, viridi, fragilissimo, superne saepe 

 latiore. 



Barbulae acutae (Brid.) Brid. proxima. 



PI. 1, fig. 1-XII. Sterile, only flowers containing 3-5 archegonia with few 

 or no paraphyses found; the archegonial leaves lanceolate with mostly a long- 

 excurrent costa enlarging toward the apex, the inner leaf often very small and 

 consisting largely of the costa ; stems 3-4 mm. high, with rhizoids at the base, about 

 125 mm. in diameter, with rather indistinct central strand and walls of 1 or 2 

 layers of cells with but slightly thickened cell-walls; stem-leaves erect, rather 

 closely appressed-imbricate when dry, ovate-lanceolate, the blade up to 1-5 

 mm. long and -40 mm. wide, with an excurrent costa up to 130 fi long above 

 the blade, often enlarging and somewhat flattened toward the apex and mostly 

 broken off in the older leaves, in cross-section showing 2-4 guide cells without 

 stereid cells in the upper part but in lower costa with rather small, thick-walled 

 cells above and below the guide-cells, extending to the surface; leaf -margin 

 entire, more or less recurved along the middle ; cells of leaf smooth, in the upper 

 half of blade mostly transversely oval with thickened walls, the median cells 8-10 

 fi by 5-8 fi gradually changing below the middle of leaf to the more or less 

 oblong or rectangular and paler cells of the basal part. 



Type locality, Murray point, Victoria island, latitude 68°40'N., on dolomite 

 cliffs, March 25, 1916, Frits Johansen. 



This species comes nearest to B. acuta (Brid.) Brid., but the elongate basal 

 cells extend farther up the leaf and the stereids of the lower part of the costa 

 are not so well defined. 



Barbula vinealis Brid. 



Atkoon creek, Clifton point. Northwest Territories, May 6, 1916, D. Jen- 

 ness. Valley back of Bernard harbour. Northwest Territories, May 9, 1916, F. 

 Johansen. 



Genus Pottia Ehrh. 



Pottia Heimii var. obtusifolia Hagen 



Tundra at Cape Bathurst, Northwest Territories, latitude 70'' 35 N., July 

 26, 1916, fruiting. 



Genus Tortula Hedw. 



Tor tula ruralis (L.) Ehrh. 



On boulder at Konganevik, Camden bay, Alaska, June 29, 1914. Valley back 

 of Bernard harbour, Northwest Territories, May 9th, 1916. Island near Cock- 

 burn point, Dolphin and Union strait, Northwest Territories, July 15, 1916. 



Family ENCALYPTACEAE. 

 Genus Encalypta Schreb. 



Encalypta procera Bruch. 



On cliffs on "Ptarmigan creek," Sadlerochit river, Alaska, Nov. 13, 1913. 



Encalypta brevicoUa, Bruch. 



Tundra on Barter island, arctic coast of Alaska, summer 1918, J. Hadley. 



