94 NORTH AMERICAN FLORA [VoLuME 15 
peristome usually present, the teeth more or less divided along the median line, with the outer 
plates vertically striate and forks pale and papillose above. 
T he species, Angstroemia euphoroclada C. Mull. 
Distinguished from Dicranella by the stout seta regularly recurved when moist, from Cempylopus 
by the lack of differentiated alar cells. 
1. Campylopodium pusillum (Schimp.) R. S. Williams. 
Campylopus pusillus Schimp.; Besch. Mém. Soc. Sci. Nat. Cherbourg 16: 165. 1872. 
Angstroemia Sartorii C. Mill. Linnaea 38: 629. 1874. 
Angstroemia Pilopogon C. Mill. Linnaea 38: 630. 1874. 
Dicranella Sartorii Jaeger, Ber. St. Gall. Nat. Ges. 1877-78: 373. 1879. 
Dicranella Pilopogon Jaeger, Ber. St. Gall. Nat. Ges. 1877-78: 373. 1879. 
Campylopodium Pilopogon Paris, Index Bryol. 238. 1894 
Campylopodium Sartorii Paris, Index Bryol. 238. 1894. 
Dicranum magnirete C. Mill. Bull. Herb. Boiss. 5: 186. 1897. 
Dicranum Tirckheimii C. Mull. Bull. Herb. Boiss. 5: 186. 1897. 
Dioicous: plants in rather loose tufts with a few radicles at the base; stems simple, up to 
about 1 cm. high, with leaves from an erect base more or less spreading-flexuous, rarely some- 
what secund at the apex of the stem: lower stem-leaves short, ovate-lanceolate, not clasping, 
the upper and perichaetial ones longer, up to about 4 mm. long, from an ovate, clasping base 
rather abruptly narrowed to a slender subula two or three times as long, the apex usually 
slightly denticulate and margins at the shoulder of the leaf crenulate; costa stout, about 80 » 
wide near the base and one third to one fifth the width of the leaf-base, filling most of the 
subula, the very narrow leaf-blade often extending nearly to the apex; lower leaf-cells mostly 
rectangular, up to about 10 » wide and 35-45 » long, or the lowest basal cells in the stem-leaves 
often shorter and broader, 12 » wide by 12-24 » long, with scarcely thickened, not pitted walls; 
cells at the leaf-shoulder shorter and irregular, becoming very narrow in the blade above: 
seta stout, brown, up to 6 mm. long, sinuous and twisted when dry, regularly recurved, sig- 
moid, or geniculate above the middle when moist: capsule oval, 1-1.5 mm. long, smooth or 
appearing somewhat ribbed when dry, without stomata; exothecal cells, irregularly elongate, 
with uniformly much thickened walls, becoming small and short just below the mouth; lid 
conic with an obliquely rostrate beak sometimes nearly equaling the capsule in length; annulus 
large; peristome-teeth separate to near the rim of the capsule, at the base up to 40 u wide, 
200 uw or more high, vertically striate below, with articulations 9-12 u apart, above paler and 
papillose, divided three fourths down or more or sometimes united above: spores coarsely 
papillose, wp to 24» in diameter: calyptra entire at base, smooth, split on one side to above 
the middle. 
Types LOCALITY: Orizaba, Vera Cruz. 
DISTRIBUTION: Mexico; Guatemala; Jamaica; also in South America. 
The specimens included here seem to differ chiefly in length of stem and point of leaf. The 
differences of peristome given by Mueller as distinguishing A. Sartorius and A. Pilopogon are appar- 
ently due to immaturity of the capsule. 
4. DICRANOWEISIA Lindb. Oefv. Sv. Vet.-Akad. 
Forh. 21: 230. 1864. 
Autoicous. Mostly rather small species, in compact tufts, with branching stems radic- 
ulose only at the base. J,eaves ovate-lanceolate or lanceolate-subulate, spreading on all 
sides, mostly crispate when dry, more or less subtubulose, grooved above, entire; costa van- 
ishing in the apex or percurrent; lower cells rectangular with slightly or not thickened and 
not pitted walls; upper cells gradually shorter, often slightly transversely elongate, with rather 
thin walls, smooth or somewhat mamillose; alar cells either mostly short-rectangular and 
brownish or not differentiated; inner perichaetial leaves much like the upper stem-leaves or 
convolute to the truncate or rounded apex. Seta solitary, erect. Capsule erect, regular, 
elliptic or cylindric, short-necked, smooth, finally becoming somewhat rugose or furrowed, 
especially at the base; exothecal cells thin-walled, square to hexagonal and somewhat elongate, 
much smaller just below the rim of the capsule and transversely elongate; annulus present or 
wanting; peristome-teeth inserted below the mouth of the capsule, lanceolate, entire or slightly 
split at the apex, the median line usually indistinct, usually papillose on the outer face (some- 
