Part 2, 1913] DICRANACEAE 97 
5. Dicranoweisia subcompacta Card. & Thér.; Holz. Bot. 
Gaz. 30: 122. 1900. 
Flowers and fruit unknown: plants in dense cushions, with more or less branching stems 
up to 8 mm. high: leaves close together, when moist nearly erect, when dry incurved, scarcely 
crispate, the upper ones 1-1.5 mm. long, from an ovate or oblong base gradually narrowed to a 
grooved, entire, nearly smooth point with flat or slightly incurved margins and a rather acute 
apex; costa nearly or quite percurrent, often pale and narrow below, near the base 15-25 uw 
wide; leaf-cells with rather thin walls throughout, the upper ones irregular, more or less 
angular, scarcely elongate, the lower ones pale, rectangular, 8-10 » wide and 25-40 w long, the 
alar cells either indistinct or forming a brown group of often slightly inflated cells scarcely 
reaching half way to the costa. 
TYPE LOCALITY: Montana. 
DIstRIBUTION: Known only from the type locality. 
ILLUSTRATIONS: Bot. Gaz. 30: pl. 11, f. 1. : 
EXCLUDED SPECIES 
Dicranoweisia obliqua Kindb. Ot.awa Nat. 5: 195 (1892), from the Selkirk Mountains, 
British Columbia, is Dicranum Schisti. 
5. ONCOPHORUS Brid. Bryol. Univ. 1: 389. 1826. 
Cynodontium Schimp. Coroll. Bryol. Eur. 12. 1855. Not Cynodontium Brid. 1806. 
Autoicous: male flowers solitary, sessile at the base of the perichaetium, or 2 or 3 in number, 
usually on short, scarcely evident stalks, scattered at short intervals on the stem below. 
Mostly mosses of medium or sinall size growing on rock, damp earth along streams, or logs, 
and forming compact cushions or sometimes extensive mats. Leaves mostly crispate, never 
falcate-secund, linear-lanceolate or ovate-lanceolate, from smooth to highly mamillose, the 
border entire or serrate, usually of two layers of cells and more or less recurved on one or 
both sides (except in O. Wahlenbergsi, which has the margins often flat and of one layer of cells); 
costa nearly percurrent or excurrent, in cross-section showing guide-cells with more or less 
distinct stereid-bands above (except in O. sirumulosum) and below and ‘differentiated outer 
cells; cells of blade in the upper part of the leaf mostly scarcely elongate, often rather obscure 
and irregular, in the lower part rectangular with scarcely or not thickened or pitted walls 
(or rarely slightly pitted in O. Wahlenbergii); alar cells mostly not distinct, sometimes quite 
well defined in O. virens and less so in O. Wahlenbergii and O. polycarpos. Seta straight or 
curved. Capsule ovate or oblong, from straight and erect to curved and horizontal, mostly 
deeply furrowed when dry and empty, but often nearly or quite smooth in O. virens and O. 
Wahlenbergii, with or without struma and with stomata in mostly one row at the base of the 
spore-sac; annulus present or wanting; peristome-teeth mostly divided half way down or farther 
into two papillose forks, the outer plates vertically striate, the inner with distinct articulations 
(in O. Schisti only are the teeth undivided at the apex and perforate below); lid with the base 
entire or notched and with an oblique beak not more than one half as long as the capsufe. 
Spores rough. , 
Type species, Fissidens polycarpos Hedw. 
Limpricht keeps O. virens and O. Wahlenbergii as a genus distinct from the others here included 
“in Oncophorus, claiming that they differ in having distinct alar cells and accessory guide-cells in the 
costa. These differences however do not seem to hold, for O. polycarpos often has more distinct 
alar cells than are found in O. Wahlenbergii, while I have never found accessory guide-cells in either 
European or American specimens of the latter. ; i ; 
Oncophorus differs from Dicranum chiefly in having the leaves crispate with mostly recurved 
margins, often of a double thickness of cells. The leaves are never falcate-secund, the alar cells 
usually much less differentiated. 
Peristome-teeth undivided above, more or less perforate below. 1. O. Schisti. 
Peristome-teeth mostly divided into two forks. : 
Annulus present. : 
Upper leaf-cells more or less irregular and transversely elongate, about 
3 4 wide, somewhat obscure and rough on both sides. 2. O. polycarpos. 
