205 
Although I have had all of Professor Macoun’s material of 
this species, I have not found any trace of the sporophyte and am 
unable clearly to differentiate this species from B. rutabulum. The 
stem leaves are more slender-pointed than is usual with B. ruta- 
bulum and are also somewhat plicate. 
34. BRACHYTHECIUM PSEUDO-STARKEI Ren. & Card. Bot. Centralbl. 
44: 423. 1890. 
** Dioicous, loosely caespitose, green ; stem erect or ascending, 
flexuous, laxly pinnate, branches elongate, attenuate: leaves not 
close, patulous, ovate-lanceolate, plicate, acuminate, acumen long, 
sometimes tortuous ; margin generally serrate all around; costa 
extending into the acumen ; cells linear-rhomboidal, elongate, at- 
tenuate, alar lax, soft, quadrate, hyaline: not fruiting.” 
Washington. (Roll.) 
Evidently aquatic, very lax and distantly foliate, with the habit 
of an Amblystegium. Related to B. rivulare and B. rutabulum; 
distinguished from both by its slender habit ; fsom the first by its 
more slender-pointed leaves; from the second by having the 
leaves plicate and the branch leaves shorter-pointed. Stem leaves 
1.8-2 by 1 mm.; middle branch leaves 1.4 by 0.8 mm. 
35. BRaAcHuvTHECIUM Rör Ren. & Card. Bot. Centralbl. 44: 422. 
1890. Hedwigia, 32: 263. 1893. 
* Dirty or yellowish-green: stems soft, depressed, scarcely radi- 
culose, subpinnate ; branches elongate, flexuous: leaves ovate- 
lanceolate, decurrent, quite long and narrowly acuminate, faintly 
plicate; margin sinuate or denticulate, plane in middle, revolute at 
base and at acumen; costa reaching beyond middle to 24 length ; 
cells narrow, elongate, linear, alar cells few subquadrate; evidently 
dioicous.”’ 
Vancouver. (Róll.) 
The leaves of this species are shaped much like those of B. 
plumosum, but they are conspicuously dentate. 
36. BRACHYTHECIUM CAVERNOSUM Kindb. Rev. Bryol. 22: 86. 
1895. 
“ Differs from B. rutabulum: leaves very concave, plicate, 
