Parr 2, 1913] DICRANACEAE 85 
Microdus cubensis Paris, Index Bryol. Suppl. 244. 1900. 
Microdus debilis Besch.; Paris, Index Bryol. ed. 2.3: 236. 1905. 
Microdus laxiretis Paris, Index Bryol. ed. 2.3: 237. 1905. 
? Microdus Wrightii Paris, Index Bryol. ed. 2.3: 240. 1905. 
: Plants in rather loose, green mats, with slender, often branching sterms mostly 2-5 mm. 
high: stem-leaves when moist erect-spreading, sometimes slightly secund, the lower ones ovate- 
lanceolate, blunt, about 0.5 mm. long, the upper ones up to a little more than 2 mm. long, 
from a slightly broader, not clasping base gradually narrowed to an almost linear or slightly 
tapering, grooved limb, with the apex from broadly rounded to acutish and from nearly entire 
to crenate or toothed; leaf-margin more or less recurved and serrulate below the apex; costa 
stout, prominent on the back, sometimes rough or serrulate above and ending below the leaf 
apex: upper leaf-cells from nearly square to short-rectangular the lower one much larger and 
paler, with lax, rather thin walls throughout; perichaetial leaves scarcely clasping or different 
from the upper stem-leaves: seta weak, flexuous, up to 12 mm. long, yellowish or brown: 
capsule erect or slightly nodding, oval to short-cylindric, smooth, with a mostly broad mouth, 
an obliquely rostrate lid nearly as long as the capsule, and a large annulus; exothecal cells 
with somewhat thickened not sinuous walls about 20 wide and 25-40, long; peristome- 
teeth more than 200 p» high, vertically striate below, divided about three fourths down into 
slender, papillose segments: spores rough, about 16 u in diameter. 
TYPE Locality: Southern Brazil. 
‘x DisTRIBUTION: Southern United States; Mexico; Central America; West Indies; also in South 
merica. 
ol se Ann. Sci. Nat. II. 12: ol. 1, f. 3; Schwaegr. Suppl. 4: pl. 108a; Sull. Ic. Muse. 
Exsicc.: Drummond, So. Mosses 51; Sull. Musci Cub. Wright. 34. 
‘The specimens included here under D. Hilariana are somewhat variable but not more so than 
specimens from the United States that have been referred, and I believe correctly so, to D. debilis. 
The variation consists chiefly in the length of the upper leaves, the width of the leaf-apex, and the 
amount of serration on the leaf-border above and on the back of the costa near its termination. 
In all the specimens at feast some of the leaves have a rounded-obtuse, crenate or dentate apex and 
leaf-cells pale, comparatively short, with lax, thin walls. 
‘om +, 8., Dicranella Herminieri Besch. Ann. Sci, Nat, VI. 3: 180. 1876 
TT “+ la J 3 re: : ey, a 3: : : 
BAT ue HAL Pak Sets 54ers Wis Pat hah Figos, 
Dicranella leptotrichoides Ren. & Card. Bot. Gaz. 19: 237. 1894. 
Angstroemia hydrophila C. Mill. Hedwigia 37: 230. 1898. 
Microdus hydrophilus Paris, Index Bryol. Suppl. 245. _ 1900. 
Dicranella substenocarpa Ren. & Card. Bull. Soc. Bot. Belg. 41!: 11. 1905. 
Microdus leptotrichoides Paris, Index Bryol. ed. 2.3: 237. 1905. 
Plants mostly in dull-green, loose mats, or somewhat gregarious; stems usually simple, 4-6 
mm. high or in wet places rarely up to 2.5 cm. high: leaves erect-appressed, slightly curved 
when dry, erect-spreading when moist; stem-leaves short, ovate-lanceolate to lanceolate, 
gradually narrowed to a rather broad, obtuse, nearly or quite entire apex, with a stout, scarcely 
percurrent costa, at the base about one fifth the width of the leaf-base; leaf-cells with walls 
slightly thickened nearly to the base, the median ones mostly narrowly rectangular, 4-5» 
wide and usually 2-6 times as long, the basal ones broader and longer; perichaetial leaves up 
to 3 mm. Jong, from an ovate base gradually narrowed to a grooved, narrowly lanceolate 
limb about twice as long with the borders often recurved and the costa vanishing below the 
obtuse or sometimes acute, entire or slightly crenate apex: seta usually yellowish, flexuous, 
6-8 mm. long: capsule erect, symmetric, oval, with a large annulus and long-rostrate lid; 
peristome-teeth vertically striate below, more than 200 » high, divided two thirds down or 
farther into 2 or rarely 3 slender, papillose forks: spores slightly rough, up to 18 « in diameter. 
Typr LocaLity: Guadeloupe. : 
DISTRIBUTION: South Carolina to Louisiana and Florida; Cuba; Porto Rico; Jamaica; Guadel- 
oupe; Martinique; Mexico; Costa Rica. . XX : 
Exsicc.: Sull. & Lesq. Musci Bor. Am. 460; ed. 2.62; Aust. Musci App. 468; Holz. Musci Acroc. 
Bor. Am. 129; Sull. Musci Allegh. 177 (as Trichostomum tenue). ; 
This species is nearest D. Hilariana, but has a narrower, more entire leaf-apex, longer, rather 
thicker-walled, narrower leaf-cells, and spores a little larger. . 
Nore: Dicranella compacta (Schimp.) Mitt. Jour. Linn. Soc. 12: 37. 1869 (Angstroemia com- 
pacta C. Mill. Syn. 2: 606. 1831; Dicranoweisia compacta Schimp.; C. Miill. loc. cit., as synonym. 
1851) is probably the same as D. Herminieri, in which case it will replace that name. The small 
amount and immature condition of the type material of D. compacta examined does not justify 
