Part 2, 1913} DICRANACEAE 107 
the alar ones forming a large group of broad cells, brownish throughout or nearly hyaline on 
the inner side and not quite extending to the Costa; upper leaf-cells mostly short, the median ' 
often transversely elongate and from 5 by 3 to 5 by 5-8 in diameter; perichaetial leaves 
“with high-convolute base rather gtadually narrowed to a serrulate point often extending 
above the capsule: seta about 1.5 cm. long: capsule oblong to oblong-cylindric, about 3 mm. 
long, with stomata in mostly one row near the base; peristome-teeth lanceolate, projecting 
above the mouth 200% or more, dark reddish-brown below, paler above, densely papillose 
throughout, with rather indistinct articulations and more or less divided along the median line 
nearly to the base or sometimes almost entire; lid and calyptra not seen: spores nearly smooth, 
up to 144 in diameter. 
TYPE LOCALITY: Cuba. 
DisrRrisution: Known only from the type locality. 
5. Holomitrium arboreum Mitt. Jour. Linn. Soc. 12: 58. 1869. 
Holomitrium macrocarpum C. Mill. Nuovo Giorn. Bot. Ital. II. 4: 36. 1897, 
Pseudautoicous: male plants attached by tomentum mostly to the older perichaetial 
buds, minute, 1-3 mm. high, usually bearing 2 or 3 flower-buds, the antheridial leaves lance- 
olate-pointed, costate, acute and serrulate at the apex, enclosing 4 or 5 oblong antheridia 
about 0.2 mm. long with few paraphyses slightly longer: fertile plants in compact rather dark- 
green or brownish-green tufts with branching stems up to 5 cm. high: stem-leaves crispate 
when dry, up to 7 mm. long, from an oblong or somewhat ovate, erect and imbricate base 1.5-2 
mm. long narrowed to a lanceolate, serrulate, acute point 1.5-4 mm. long, the lower leaves 
often much shorter than the upper; costa slightly excurrent, more or less toothed on the back 
toward the apex, 60-80 » wide in the lower part of the leaf, in cross-section near the middle 
showing mostly 5 or 6 guide-cells with stereid-bands above and below and outer cells differ- 
entiated; basal leaf-cells much elongate, with thickened, pitted walls, the alar group very 
distinct, brownish, or often pale on the side toward the costa, the upper leaf-cells mostly 
short, somewhat angular, mamillose, in rows with furrows between, mostly 7-8 4 wide by 7-10 z 
long; perichaetial leaves high-convolute, reaching one half up the seta or more: seta 1.5-2 cm. 
long: capsule nearly cylindric, 4-6 mm. long, with stomata in one row at the base; peristome- 
teeth projecting more than 200 » above the rim, lanceolate, densely papillose, dark below, pale 
and very slender above, scarcely divided along the median line; lid with a subulate point of 
variable length, sometimes nearly as long as the capsule: spores not quite smooth, up to 164% 
in diameter. 
Type Locauity: Andes of Peru, at 1300 meters. 
DistRIBUTION: Mexico to Bolivia. 
6. Holomitrium Wrightii Sull. Proc. Am. Acad. 5: 279. 1861. 
Pseudautoicous: male plants minute, in clusters on tomentum of the older perichaetial 
buds, the stems about 1 mm. high, bearing 2 or 3 flowers, the inner antheridial leaves broadly 
ovate, short, acute, the outer leaves much longer, broadly lanceolate above, with often distant, 
spreading teeth on the margin and the costa faint; antheridia 5 or 6, about 0.25 mm. long, with 
paraphyses: fertile plants in rather dark-green tufts, with branching stems up to 6 em. long: 
stem-leaves nearly linear, 3.5—4.5 mm. long and 0.4 mm. wide, more or less twisted and sub- 
tubulose above, never crispate when dry, about four fifths up the leaf narrowed to an acute 
point, the not thickened margins with irregular, spreading teeth extending downward one 
third to one half way to the base; costa shortly excurrent, 50-60 » wide in the lower part of 
the leaf, smooth on the back, in cross-section showing about 4 large cells on the upper side, 
about the same number of similar cells on the under side with 5 or 6 much smaller cells enclosed 
within, all with rather thin walls; alar cells distinct, pale-yellowish to hyaline, extending about 
half way to the costa; cells of the blade rectangular from the base about three fourths of the 
way up the leaf, with somewhat thickened, pitted walls, the median ones about 104 wide 
by 30-40 uw long, the remaining cells in the upper part of the leaf becoming more or less obliquely 
elongate-hexagonal; perichaetial leaves convolute about one third up the seta, the inner 
gradually narrowed to a slender point usually shorter than the basal part and slightly serrulate 
