Hepaticce of North America. 58 



Leaves complicate-bilobed, the dorsal lobe usually 

 smaller; inner involucre compressed parallel to the 

 plane of the stem, the apex usually decurved, the 

 mouth truncate, entire or ciliate. XXIX. SCA- 

 PANIA. 



NOTE. Some forms of Jungermania without arnphiga stria 

 have the leaves complicate-concave and may be sought here, 

 especially Nos. 20, 21, 22 and 28. See foot note under R in 

 this table. 



Leaves bilobed or bifid at apex, not complicate V 



Leaves entire or merely dentate at apex X 



f Involucre many leaved W 



* "i Involucre few leaved; some forms of XXVIII JUNGER- 



Involucral leaves imbricate; inner involucre wanting; 

 leaves closely imbricate. XXXII. CESIA. 



Involucral leaves united nearly to the top into an ob- 

 long tube; inner involucre 6-toothed, connate with 

 the outer. XXXI. NARDIA. 



Involucral leaves free; inner involucre present; some 

 forms of XXVI. CEPHALOZIA. 



Involucral leaves larger than those of the stem ; inner 

 involucre compressed at right angles to the plane 

 of the stem, the mouth truncate, entire or ciliate- 

 toothed; leaves often turned to one side. XXX. 

 PLAGIOCHILA. 



Involucral leaves similar to those of the stem; inner 

 involucre retrorsely subarcuate or at length cylin- 

 dric; the mouth contracted, ciliate; the cilia ar- 

 ticulate, connivent in a short cone; leaves entire. 

 XXIII. LIOCHL^ENA. 



Not included in the above are some species of the 

 ubiquitous XXVIII JUNGERMANIA. 



