110 NORTH AMERICAN FLORA [VotumE 15 
Leaves falcate-secund or spreading on all sides, lanceolate-subulate with 
a straight or flexuous, not crispate point, when dry. 
Upper leaf-cells mostly not elongate or partly elongate, up to 3 times 
as long as wide. 
Short, green, papillose cells of the upper part of the leaf extending 
in a broad band next to the costa nearly to the base. 1. L. serrulatum. 
Short, papillose cells of the upper part of the leaf not extending into 
a distinct band next to costa in the basal part. 
Leaves densely papillose on the back to below the middle. 
Leaves about 6 mm. long, with a distinct, hyaline border 
extending to or nearly to the base and 8-12 cells wide a 
little above the base. eck 2. L. albulum. 
Leaves 3-5.5 mm. long, with a narrow border above, not or 
scarcely distinct in the lower part of the leaf from the 
cells within. 
Leaves 4-5.5 mm. long, the point long and slender. 3. L. Criigerianum. 
Leaves scarcely 3 mm. long, the point short and stout. 4. L. subimmarginatum. 
Leaves smooth on the back throughout or slightly rough at the 
apex. 5. L. Schwaneckeanum. 
Upper leaf-cells all elongate, 3-6 times as long as wide. 6. L. Mariei. 
Leaves spreading on all sides, from an ovate base rather abruptly nar- 
rowed to a nearly linear, blunt point regularly crispate when dry. 7. L. tortellum, 
1. Leucoloma serrulatum Brid. Bryol. Univ. 2: 752. 1827. 
‘Dicranum Bridelianum C. Mill. Syn. 1:354. 1848. 
Poecilophyllum serrulatum Mitt. Jour. Linn. Soc. 12:93. 1869. 
Poecilophyllum vincentinum Mitt. Jour. Linn. Soc. 12:93. 1869. 
Leucoloma vincentinum Jaeger, Ber. St. Gall. Nat. Ges. 1870-71: 412. 1872. 
Dicranum cryptocarpum C. Mill. Linnaea 38: 626. 1874. 
Leucoloma cryptocarpum Jaeger & Sauerb. Ber. St. Gall. Nat. Ges. 1877-78: 379. 1879. 
Leucoloma Riedlei Besch. Jour. de Bot. 5: 146. 1891. 
Dicranum longicapillare C. Mill. Bull. Herb. Boiss. 5: 553. 1897. 
Leucoloma longicapillare Paris, Index Bryol. Suppl. 233. 1900. 
Apparently dioicous: fertile plants in loose, green to pale-green tufts with more or less 
flexuous, inclined, branching stems up to 10 cm. high: leaves lanceolate-subulate, up to 7 mm. 
long, subtubulose, widely spreading, often nearly straight or somewhat curved-secund at the 
apex of the stem, the narrow point grooved and sharply serrulate about one fifth down the 
leaf; costa excurrent, pale, 25-40 « wide below and one twelfth to one fifteenth the width of 
the lower part of the leaf; leaf-cells in the margin hyaline, very long and narrow, forming a 
distinct border, scarcely evident near the apex, 2 or 3 cells wide about one third down the 
leaf, gradually widening below and merging into the lower leaf-cells; green cells of the upper 
part of the blade mostly oblong, 4-5 » wide by 6-12 » long, minutely papillose on the back, 
gradually becoming somewhat larger below with slightly sinuous, unequally thickened walls 
and extending in a broad band along the costa nearly to the base, the other lower leaf-cells 
except the border and alar cells much elongate with unequally thickened and somewhat pitted 
walls, the alar group brownish, extending nearly to the costa, mostly of large short cells, not 
forming auricles; perichaetial leaves a little shorter than the stem-leaves, abruptly narrowed 
to a more serrulate point: seta erect, smooth, about 1.5 mm. long: capsule about 1 mm. long, 
erect, oblong, its mouth mostly below the tips of the perichaetial leaves; peristome-teeth 
divided nearly to the base into 2 slender forks, distinctly and regularly articulate more than 
one half up, the upper parts papillose: spores smooth, up to 18 in diameter. (Description 
of fruit from the Mexican plant called Dicranum cryptocarpum by C. Miiller.) 
TYPE LocaLity: Haiti. 
DisrRisution: Jamaica; Haiti; Porto Rico;,St. Kitts; Montserrat; Guadeloupe; St. Vincent; 
Mexico and Guatemala. On decayed logs and earth. 
L. Riedlei Besch. seems to be an old, discolored specimen of L. serrulatum with much abraded 
leaves, having mostly lost the teeth at the apex and the papillae on the back. 
2. Leucoloma albulum (Sull.) Jaeger, Ber. St. Gall. 
Nat. Ges. 1870-71: 412. 1872. 
.Dicranum albulum Sull. Proc. Am. Acad. 5: 278. 1861. 
Poecilophyllum albulum Mitt. Jour. Linn. Soc. 12: 93. 1869. 
Dioicous: male flowers sessile, 3 or 4, scattered at intervals along the stem, the perigonial 
leaves much shorter than the stem-leaves, abruptly narrowed to a rough, often sinuous point 
chiefly formed by the excurrent costa, and enclosing numerous antheridia about 0.6 mm. long 
