80 NORTH AMERICAN FLORA [VoLumE 15 
incurved point a little longer than the basal part with the costa nearly percurrent and the 
margin entire except at the slightly serrulate apex; lower leaf-cells mostly pale, more or less 
rectangular, 10-12 » wide and 50-70 uw Jong, with thin walls, those above at the shoulder of the 
leaf small and transversely elongate, those in the leaf-point often rather obscure, from square 
to 2 or 3 times as long as broad with slightly thickened walls; perichaetial leaves like those 
of the stem with slightly longer clasping base: seta slender, erect, 12 mm. long: capsule oblong, 
erect, about 1.5 mm. long, with stomata in 1 or 2 rows near the base; peristome-teeth 16, 
reddish-brown, densely papillose all round, from a rather low basal membrane, divided 
almost to the base into 2 terete, slender forks about 250 uv long; lid conic, with an obliquely 
subulate beak as long as the capsule: calyptra smooth above, entire at the base: spores some- 
what rough, up to 20 uw in diameter. 
TYPE LocaLity: Colombia. 
DisTRiBurTIon: Honey Station, Puebla (Pringle 15122); also in Colombia and Ecuador. 
ILLUSTRATION: Hook. Musci Exot. pl. 141. 
2. DICRANELLA Schimp. Coroll. Bryol. Eur. 13. 1855. 
Angstroemia C. Mill. Syn. 1: 430, in part. 1848. 
Anisothecium Mitt. Jour. Linn. Soc. 12:39. 1869. 
Microdus Schimp.; Besch. Mém. Soc. Sci. Nat. Cherbourg 16: 161. 1872. 
Mostly small, dioicous, terrestrial plants, growing in cushions or broad mats, or gregarious. 
Stems erect, simple or branching, sparsely radiculose below. Leaves smooth, often distant 
and smaller below, crowded above, from straight and erect-appressed to spreading-squarrose 
or curved-secund; leaf-base from spreading-lanceolate to clasping-ovate, gradually or abruptly 
narrowed to a grooved, linear to subulate, mostly entire limb with the apex denticulate; costa 
usually stout and percurrent or excurrent, sometimes vanishing five or six cells below the 
apex of the leaf and rarely serrulate on the back in the upper part; leaf-cells from nearly square 
to linear with cell-walls sometimes thickened but not pitted, the alar not differentiated, or 
sometimes slightly so in D. squarrosa. Seta usually twisted, mostly erect and straight or 
irregularly flexuous, never regularly cygneous or geniculate when mature. Capsule from 
globose to cylindric, erect or nodding, often curved and strumose, either smooth or ribbed 
when dry and empty; exothecal cells with walls straight or sinuous, often much thickened; an- 
nulus large and compound, or simple, or wanting: peristome-teeth 16, reddish, short or elongate, 
undivided or mostly divided to below the middle into 2 or sometimes 3 papillose forks, the 
outer plates below usually vertically striate, sometimes only papillose. Spores variable in 
size, from smooth to very coarsely papillose. 
Type species, Dicranum Grevilleanum B.S.G. 
Annulus none; peristome-teeth large, 250-450 uw high, usually divided scarcely 
one half down, with a basal membrane 2-4 rows high, of darker, narrow, 
smooth cells more or less projecting above the mouth, I. ANISOTHECIUM. 
Annulus present; peristome-teeth usually much less than 3004 high, either 
very short and irregular or divided two thirds to three fourths down 
into slender terete forks, with a basal membrane of cells less differ- 
entiated than in I. 
Peristome-teeth mostly 200-300 » high and regularly divided two thirds 
to three fourths down into slender, terete, papillose forks. II. EupIcRaNELLA. 
Peristome-teeth mostly less than 200» high and divided into irregular, often 
very short forks, or not divided, with apex broad and blunt. TII. Micropvus. 
I. ANISOTHECIUM 
Leaves squarrose from an enlarged, clasping base. 
Costa 50-60 u wide, about one sixth the width of the leaf-base; leaves 
not long-decurrent. 
Costa smooth on the back. 1. D. Grevilleana. 
Costa serrulate on the back above. 2. D. Schreberi. 
Costa about 504 wide and one twentieth the width of the leaf-base; 
leaves long-decurrent. 3. D. squarrosa. 
Leaves not squarrose and without enlarged clasping base. 
Cells in margin of upper leaf narrow and indistinct, about 4 u wide. 4, D. rubra. 
Cells in margin of upper leaf broad and distinct, 8-10 » wide. 
Capsule erect; marginal leaf-cells up to 40 or 50 » long. 5. D. rufescens. 
Capsule nodding, curved; marginal leaf-cells mostly 20-30 p long. 6. D. Nicholsii. 
