185 
branches short, directed forward at an acute angle; leaves much 
more closely imbricated, especially at the tips of the branches. 
On timbers of old dam, Staley's Creek, Virginia ; sterile. 
(Dr. J. K. Small.) 
I4. BRACHYTHECIUM ACUMINATUM (Hedw.) Kindb. Can. Rec. Sci, 
1894: 72. 1894. 
Leskea acuminata Hedw. Sp. Musc. 224. M. 56. 1801. 
Leskea setosa Hedw. Sp. Musc. 226. AM. 57. 1801. 
Leskea Beyrichtt Hampe. Linnaea, 13: 47. 1839. 
Hypnum acuminatum C. Muell. Syn. 2: 334. 1851. 
Hypnum erectum Drumm. Musc. Am. 224. 
Homalothecium acuminatum Jaeger & Sauer. St. Gall. Nat. 
Gesell. 1877-1878 : 
Gametophyte in vii rather densely caespitose tufts, green to 
glossy yellow-green ; stems creeping, radiculose, primary branches 
erect or ascending, 1—3 cm. long, sparingly divided, somewhat 
radiculose, often with radiculose tips; branchlets unequal, taper- 
ing, subjulaceous, terete-foliate; branch leaves erect-imbricated, 
open and appressed when dry, lanceolate to ovate-lanceolate, 
somewhat decurrent, I—1.6 X 0.4—0.6 mm., acuminate, more or 
less serrate above, concave, somewhat plicate; margins often some- 
what revolute ; costa extending above middle ; median cells linear, 
9: 1; marginal cells broader; basal enlarged, quadrate; leaves 
of main branches deltoid ovate, broader: dioicous; male 
branches borne on the stem, gemmiform ; antheridia oblong, stipi- 
tate; perigonial leaves ovate-lanceolate, long-acuminate, concave : 
perichaetium 2-2.5 mm. long; leaves loosely erect, the inner 
ovate-lanceolate to oblong-lanceolate, long filiform-acuminate, 
distantly dentate above, costate nearly to middle. Sporophyte 
1.5—2 cm. high ; seta red-brown, smooth ; capsule brown, cylindric, 
erect or very slightly curved, varying greatly in size, 1.5-3 mm. 
long; operculum conic to short rostrate; annulus none; teeth of 
peristome united at base, lanceolate, with slender hyaline papil- 
lose-roughened points, red-brown below, margined; segments 
linear-lanceolate from a narrow basal membrane, slightly papil- 
lose-roughened above, about the length of the teeth; cilia very 
