166 LEJEUNEAE OF THE UNITED STATES AND CANADA 
20. COLOLEJEUNEA MINUTISSIMA (Smith) Schiffn. 
Jungermannia. minutissima Smith, Eng. Bot. pl. 7633. 1806. | 
Jungermannia inconspicua Raddi, Mem. Mat. e Fis. Soc. Ital. * 
Sci. Mod. 18: 34. pl. 5. f. 2. 1820. 1 
Lejeunea minutissima Dumort, Comm. Bot. 111. 1822. G. E 
L. & N. Syn. Hep. 387. 1845. 
Lejeunea minutissima B inconspicua Nees, Naturgesch. Eur. 
Leberm. 3: 279. 1838. 
Jungermannia parvula Wils. & Hook.; Drummond, Muse. 
Amer. St. Mend 172. 1841. ; 
Lejeunea Taylori Spruce, Ann. Nat. Hist. II. 4: 116 (foot- 
note). 1849. : 
Lejeunea inconspicua De Not. Mem. Acc. Tor. IL 22: 386 — 
fe 7.7.27, 180% 
Lejeunea parvula Aust. ; Lindb. Acta Soc. Sci. Fenn. 10: 481. 
1875. T 
Lejeunea (Colo- Lejeunea) minutissima Spruce, Hep. Amaz. et : 
And. 293. 1884. px 
Leeunea (Colo-Lejeunea) parvula Steph. Bot. Gazette, 17: i 
171. 1892 m 
Cololejeunea minutissima Schifin. ; Engler & Prantl, Nat. Pflan- 
zenfam. 1?: 122. 1893. 
reen, vatying to yellowish, scattered or loosely de- : 
pressed-caespitose : stems prostrate, geniculate at nodes, 0.05 MM: ۰ 
in diameter, irregularly branched : rhizoids somewhat abundant: 
leaves distant to subimbricated, the lobe obliquely to widely 
spreading, convex, ovate to subrotund, 0.22 mm. long, 0.19 mM. 
wide, rounded or very obtuse at the apex, margin crenulate from |. 
projecting cells, antical margin arching wholly or partially across 
axis and slightly rounded at the very short base, postical margin 
forming a continuous line with keel; lobule strongly inflated, 
ovoid, 9.19 mm. long, o.12 mm. wide, keel strongly arched, free 
margin curved, involute about half its length, bearing an obtuse OF 
rounded tooth just beyond middle, then obliquely truncate or lunu- | 
late with a tooth composed of two rounded cells midway between 
the obtuse tooth and end of keel; lobule often imperfectly de- x 
veloped, in such cases sometimes plane or nearly so, with an es ۱ 
most straight keel and one or both of the marginal teeth obsolete; 
stylus reduced to a single papilla, sometimes borne on the b "s 
marginal cell of the lobule, early obsolete ; cells of lobe convex o 
