K 



0* 



Hepaticce of North America. 51 



Lower lobe of leaf auriculate; inner involucre with a 

 mucronate mouth. VII. FRULLANIA. 



Lower lobe of leaf concave underneath; inner involucre 

 with a small denticulate mouth. X. MADOTHECA. 



Inner involucre terete or angular, variously winged, 

 cristate or ciliate at the angles, the mouth 3-4-lobed 

 or dentate. VIII. LEJEUNIA. 



Inner involucre somewhat depressed, plane and bilabi- 

 ate, the mouth trilobed or tridentate. IX. PHRAG- 

 MICOMA. 



Inner involucre wanting M 



Inner involucre present N 



Leaves entire or 2-toothed; outer involucre pendent. 



XVIII. CALYPOGEIA. 

 M -| 



Leaves palmately divided; fructification in a fork, not 



pendent. XV. TRICHOCOLEA. 



Leaves 2-cleft to the middle; the divisions lanceolate. 



XIV. SE^DT^ERA. 

 Leaves and amphigastria 3-5-parted half way to the 



base or more, the lobes usually lanceolate. XVII. 



LEPIDOZIA. 

 Leaves bi-tridentate at the apex. XVI. BAZZANIA. 



Amphigastria present P 



Amphigastria wanting U 



Amphigastria entire or nearly so Q 



Amphigastria 2-4-clef t, parted or divided , . S 



( Involucral leaves numerous; inner involucre at first 

 triquetrous often becoming plicate, the mouth den- 

 ticulate, ciliate or laciniate. XXVI. CEPHALOZIA. 



[ Involucral leaves few . . , R 



* The forms with succubous leaves included in the genera beyond 

 this point of the synopsis cannot be satisfactorily arranged in a synoptic 

 table; the characters of the genera are poorly defined and they contain 

 very diverse forms, some of which are described from imperfect and in- 

 complete data, which makes their reference to genera uncertain, 



