COLOLEJEUNEA JOORIANA 173 
cardiocarpa differs also in the hyaline apex of its lobe and in its 
muticous lobule, while C. platyneura shows a very small lobule 
and a false nerve of elongated cells in the lobe. 
23. Cololejeunea Jooriana (Aust.) 
PLATE 22, Fics. 9-20 
Lejeunea Jooriana Aust. Bull. Torrey Club, 6: 20. 1875. 
Lejeunea (Colo-Lejeunea) Jooriana Steph. Bot. Gazette, 17: 
171, = - 1862: 
ellowish-green or whitish, darkening somewhat with age, 
scattered or loosely depressed-caespitose : stems prostrate, 0.05 
mm. in diameter, irregularly pinnately branched: rhizoids some- 
what abundant: leaves imbricated, the lobe widely spreading, 
plane, ovate, 0.5 mm. long, 0.35 mm. wide, gradually narrowed 
from just below the middle to the rounded, obtuse or subacute apex, 
margin entire or subcrenulate from projecting cells, antical margin 
arching across axis and rounded at the very narrow base, postical 
margin forming a continuous line with keel, almost straight from 
end of keel to apex; lobule inflated, ovoid, 0.25 mm. long, 0.15 
mm. wide, keel arched, free margin involute about half its length, 
bearing an obtuse tooth just beyond the middle, then obliquely 
truncate or lunulate to end of keel, with a tooth composed of two 
rounded cells midway between the obtuse tooth and the end of keel: 
stylus inconspicuous and soon obsolete, composed of two cells in a 
row or reduced to a one-celled papilla; cells of lobe scarcely con- 
vex, with slightly thickened walls, very inconspicuous trigones and 
occasional, minute intermediate thickenings, averaging 14 p in di- 
ameter at edge of leaf, 18 » in the middle and 25 x 18 y at base; 
hyaline cells at apex one to ten in number, radially elongated, 
usually in a single row, united at their basal ends but often with 
rounded, more or less spreading, free extremities, hyaline cells 
sometimes present also along a part of antical margin, sometimes 
absent altogether, usually becoming very indistinct with age: in- 
florescence synoicous and sometimes paroicous: 9 inflorescence 
usually borne on a leading branch, more rarely on a short branch, 
innovating on one side, the innovation sometimes floriferous ; bracts 
similar to the leaves, unequally bifid, with more or less inflated 
lobule and arched keel, Jobe narrowly ovate, 0.5 mm. long, 0.25 
mm. wide, margin slightly crenulate from projecting cells, usually 
with a small group of hyaline cells at apex and occasionally on 
antical margin, lobule ovate, 0.35 mm. long, 0.2 mm. wide, crenu- 
late or denticulate in upper part from projecting cells and sometimes 
bearing one to three hyaline cells at apex, stylus sometimes three 
