84 NORTH AMERICAN FLORA [VorumE 15 
upper about 1 mm. long, from an ovate-lanceolate base gradually narrowed to a broadish, some- 
what grooved point with flat, entire or slightly serrulate margins and an acute serrulate apex; 
costa about 40 « wide at the base, one fifth the width of the leaf-base, nearly or quite per- 
current; leaf-cells rectangular with thin walls, the upper ones about 6 » wide and 40-60 u long, 
the marginal row often slightly inflated, up to 8 » wide; perichaetial leaves very similar to the 
stem-leaves but larger, up to 1.75 mm. long: seta reddish-brown, flexuous-erect, 4-7 mm. long: 
capsule ovoid, about 0.75 mm. long without lid, symmetric, erect, wide-mouthed when empty 
and smooth or slightly furrowed; annulus none; lid conic, short rostrate, one half to two 
thirds as long as the capsule; peristome-teeth about 60 » wide at the base, red, striate, divided 
scarcely one half down, with the not striate, thick-walled cells of the basal membrane extending 
_3 or 4 rows up above the mouth of the « capsule: spores slightly roughened, up to 16 win diameter. 
TYPE LOCALITY: England. 
DISTRIBUTION: New Brunswick to Ontario and Virginia; Alaska to British Columbia; reported 
from Washington and Oregon; also in Europe and Asia. 
InLustRatioNs: Dicks. Pi. Crypt. Brit. ol. 8, f. .G. Bryol. Eur. pl. 59. 
a es Sull. & Lesq. Musci Bor. Am. 48; €d. 2. 64) Aust. Musci App. 74; Macoun, Can. 
usci 
6. Dicranella Nicholsii R. S. Williams, sp. nov. 
Plants in brownish-green rather loose mats; stems about 5 mm. high with somewhat distant, 
spreading, variously curved leaves: stem-leaves, when moist, nearly straight and widely 
spreading, about 1 mm. long, from an ovate-lanceolate or lanceolate base gradually narrowed 
to a broad, grooved limb with mostly flat borders somewhat irregularly serrulate nearly one 
half down, the leaf-blade 2 or 3 cells wide on either side of the costa to the broadly acute apex; 
costa vanishing a few cells below the apex, narrow below, 30-40 4 wide at base; leaf-cells 
pellucid, distinct to the apex, rather irregularly rectangular, the median ones about 8-104 
wide and 40 » long, those of the marginal row rather paler, broader, and shorter, forming an 
indistinct border; perichaetial leaves up to 2.5 mm. long, from an ovate, somewhat clasping 
base narrowed to a limb one and one half times to twice as long as the ovate part, otherwise very 
similar to the stem-leaves: seta flexuous, reddish, 8-10 mm. long: capsule short-ovate, about 
0.8 mm. long, nodding, curved when dry, not ribbed; exothecal cells short and broad, rather 
thin-walled, highly convex on the incurved side of the capsule; annulus wanting; lid with a 
short, stout beak; peristome-teeth reddish-brown, up to 350» high, mostly divided more than 
one half down into unequal, slender, papillose forks,,vertically striate below with lamellae 
on the inner face not very prominent, mostly about 20 uw apart, the basal membrane of three 
or four rows of darker cells projecting slightly above the mouth of the capsule: spores nearly 
smooth, up to 14 w in diameter. 
Type collected between New Haven Gap and Vinegar Hill, Jamaica, G. E. Nichols 155 (herb. 
N. Y. Bot. Gard.). 
This species may be distinguished from D. rubra by the flat borders of the leaves, with much 
wider cells. It is nearest to D. rufescens, but differs in the more spreading leaves, nodding capsule, 
shorter marginal cells of the leaf and base of the peristome, in which the narrow, smooth cells with 
thickened walls do not extend well above the mouth of the capsule as in D. rufescens, 
7. Dicranella Hilariana (Mont.) Mitt. Jour. Linn. 
Soc. 12: 31. 1869. 
Dicranum Hilarianum Mont. Ann. Sci. Nat. IT. 12:52. 1839. 
Dicranum debile Wilson, in Drummond, So. Mosses 51. 1841. 
Dicranum tenuirosire Kunze; (Mont. Ann. Sci. Nat. II. 14: 347; hyponym. 1840) Schwaegr. 
Suppl. 4: pl. 108a. 1842, 
Angstroemia Liebmanniana C. Mill. Syn. 2: 605. 1851. 
Dicranella Liebmanniana Mitt. Jour. Linn. Soc. 12: 32. 1869. 
Campylochaetium mexicanum Besch. Mém. Soc. Sci. oe 16: 168. 1872. 
Angstroemia mexicana C. Mill. Linnaea 38: 630. 1874. 
Angstroemia trematodontifolia C. Mill. Linnaea 38: 630. 1874, 
Dicranella mexicana Jaeger & Sauerb. Ber. St. Gall. Nat. Ges. 1877-78: 373. 1879. 
Dicranella trematodontifolia Jaeger & Sauerb. Ber. St. Gall. Nat. Ges. 1877-78: 376. 1879. 
Dicranella debilis Lesq. & James, Man. 66. 1884. 
Dicranella leptorhyncha Ren. & Card. Bull. Soc. Bot. Belg. 311: 143. 1893. 
Dicranella laxiretis Ren. & Card. Rev. Bryol. 20: 30. 1893. 
Angstroemia pseudo-debilis C. Mill. Hedwigia 37: 229. 1898. 
? Angstroemia Wrightii C. Mill. Hedwigia 37: 229. 1898. 
