104 JUNGERMANNIACEAE 
Key to the Species. 
Underleaves present (usually inconspicuous). 3. L. heterocolpa. 
nderleaves wanting (unless in association with Ф bracts). 
Leaves bilobed to below the middle, complicate, transversely inserted ; the dorsal 
lobe lanceolate, suberect or ascending ; the ventral lobe ovate or oblong-ovate, 
patent-horizontal. 5. L. ovata. 
Lobing or cleavage of the leaves not extending below the middle. 
Leaves unequally 2-5-lobed 14-14 their length, the lobes acutely and in most 
cases spinescently pointed, the margins more or less spinulose-dentate ; 
median leaf-cells 30-60 и. I, Г. ери 
Leaves 2- (rarely 3-) lobed 3-3 their length, close or approximate, Ше lobes 
acute, occasionally apiculate, rarely subobtuse, entire, the sinus broad ; me- 
dian leaf-cells 24-32 и. . L. ventricosa. 
Leaves 2-lobed i-i their length, usually distant or merely approximate, the 
4. L. inflata. 
ч 
lobes obtuse, entire, the sinus rather narrow. 
~ 
LoPHOziA INCISA (Schrad.) Dumort. Rec. d'Obs. Jung. i7. 
1835. 
Jungermannia incisa Schrad. Syst. Samml. Krypt. Gew. 2: 5. 
1797. Schrad. Jour. Bot. 1801: 67. 1803. Hook. Brit. Jung. 
pl. 10. 1816. 
_ Light green or darkening, densely and intricately caespitose of 
widely depressed-gregarious : stems very short and thick (4-6 mm. 
X .27-1.1 mm.), ascending, simple,'once furcate, or sending out one 
or two lateral branches toward the apex ; root-hairs numerous, long, 
colorless : 
dies usually aggregated near the шойын 
ncc h; gemmae frequent, mostly in clusters ; 
he tips of the leaf-lobes, irregularly tetrahedral ог cubico-sphae 
roidal, "niSeptate: lanceolate or subulate underleaves sometimes 
Present іп association with the 9 bracts, otherwise wholly wanting - 
dioicous : 4 bracts closely crowded together toward stem-ape* 
scarcely different from the ordinary leaves ; antheridia single ot № 
».18-.2 mm. in diameter, on very short рейс 
than | ? bracts a little larger than the leaves, шы 
n ‘опе, deeply 3—5-cleft, more abundantly dentate and mor. 
