("5) 



shady places on earth. Collected with rather old fruit, 

 August 4th. The lid about equals the capsule in length, the 

 calvptra extends nearly J down capsule. Teeth red and 

 closely twisted when first exposed, later becoming scarcely 

 twisted. Outer walls of the cells of leaf subula much thick- 

 ened (574). 



Barbala subulata (L.) Beauv. Dawson. On earth in 

 rather dry places (575). 



Barbala nivalis (L.) Hedw. On rocks about Lakes Lin- 

 deman and Bennett (576). 



Bryobrittonia R. S. Williams, gen. nov. 



Closely related to Tortala and Desmatodon from which it 

 is distinguished by the mamillose leaves, the exposed surfaces 

 of the very distinct cells being highly convex. From Trich- 

 ostomum and Timmiella it is distinguished by the costa with 

 only one stereid band ; the first of these also has the leaves 

 smooth or papillose and the second has a leaf lamina of 2 

 layers of cells, mamillose on the upper surface only. 



This genus is dedicated to Mrs. Elizabeth G. Britton, by 

 whose aid so many American students of our mosses have 

 been encouraged. 



Bryobrittonia pellucida R. S. Williams, sp. nov. 



With much the habit of Tortala latifolia but leaves much 

 longer and narrower above. Stems mostly simple, radiculose 

 below, in loose, rather dark green tufts up to 2 cm. high, in 

 cross-section irregularly oval (about .320 mm. long) with 

 walls of 2 or 3 rows of slightly thickened irregular cells, 

 ground tissue of large thin-walled cells, surrounding a dis- 

 tinct central strand of numerous small thin-walled cells. 

 Terminal leaves (often enclosing numerous long paraphyses- 

 like hairs) oblong lanceolate, up to 7.5 mm. long and 1.5 

 mm. broad, plicate and somewhat crispate when dry or rarely 

 nearly straight, mamillose on both faces except dorsal side 

 of costa, crenulate-serrate on flat borders in upper half, ob- 

 tusely or somewhat acutely pointed, with stout costa (.140 

 mm. wide near base) long-decurrent on stems and vanishing 

 several cells below apex. Lower leaves ovate-oblong (about 



