M 



Heimticfi' of NortJi America. ' 51 



Lower lobe of leaf auriculjite; 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 bilaln- 



ate, the mouth trilobed or tridentate; IX. Phrag- 



MICOMA. 



I Inner involucre wanting M 



( Inner involucre present N 



r Leaves entire or 2-toothed; outer involucre pendent. 



I XVIII. Calypogeia. 



J 



Leaves palmately divided; fructification in a fork, not 

 pendent. XV. Trichocolea. 



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



XIV. Sendtnera. 

 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 



f Involucral leaves numerous; inner involucre at first 

 triquetrous often becoming plicate, the mouth den- 

 ticulate, ciliate or laciniate. XXVI. Cephalozia. 



l^ Involucral leaves few R 



* The forms with succubous leaves inchided 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 niakes their reference to genera uncertain. 



N 



0* 



Q- 



