(115 ) 
shady places on earth. Collected with rather old fruit, 
August 4th. The lid about equals the capsule in length, the 
calyptra extends nearly } 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). 
Barbula subulata (lu.) Beauv. Dawson. On earth in 
rather dry places (575). 
Barbula ruralis (L.) Hedw. On rocks about Lakes Lin- 
deman and Bennett (576). 
Bryobrittonia R. S. Williams, gen. nov. 
Closely related to Zortula and Desmatodon from which it 
is distinguished by the mamillose leaves, the exposed surfaces 
of the very distinct cells being highly convex. From 77rzch- 
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 Zortula latzfolia 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 
