32 Illinois State Laboratory of Natural History. 



f Thallus copiously reticulate and porose. IX. CONO- 



Q. J CEPHALUS. 



I Thallus obscurely reticulated. V. DUVALIA. 



(Lobes of carpocephalum scarcely distinguishable from 

 the involucres I 

 Lobes of carpocephalum clearly apparent K 



Thallus distinctly areolate and porose, squamigerous. 



I J XII. LUNULARIA. 



[_ Thallus rigid, indistinctly porose. XL AITOKIA. 



{Androecium peduncled; thallus large, thin, with a slight 

 COsta. VIII. DtJMORTIERA. 

 Androscium ( so far as known ) sessile L 



( Thallus very indistinctly porose. VII. ASTERELLA. 



L ) 



( Thallus clearly porose M 



f Carpocephalum 3-4 lobed, hemispheric or conoidal. IV. 

 M J GKIMALDIA. 



^ Carpocephalum 2-4 divided to base. III. SAUTERIA. 



I. MARCHANTIA L. 



Plant dioecious. Carpocephalum peduncled, radiate or 

 lobed. Peduncles areolate, arising from a sinus in the apex of 

 the expanded forking thallus. Outer involucres alternate with 

 the rays, 2-valved, lacerate, membranous, enclosing several 

 1-fruited, 4-5-parted involucres. Calyptra persistent, fissured 

 at the apex. Capsule globular, exserted, pendulous, dehiscent 

 by several revolute segments or teeth. Spores smooth. Ela- 

 ters long, slender, attenuate at each end. bispiral. Andrcecium 

 peduncled, peltate, radiate or lobed. Thallus large, areolate, 

 porose, with a broad diffused midrib, densely rooting. Gemmae 

 lenticular, borne in a cup-shaped receptacle on the back of the 

 thallus. Named for Nicholas Mar chant, a French botanist, 

 d. 1678. 



