32 IIl/Nuis State L(d)oratonj <}f XafiWid Itistonj. 



f Thallus copiously reticulate ^nd porose. IX. Cono- 



(J J CEPHALUS. 



[^ Thallus obscurely reticulated. V. Duvalia. 



f Lobes of carpocephalum scarcely distinguishable from 

 jj J the involucres I 



[^ Lobes of carpocephalum clearly apparent K 



r Thallus distinctly areolate and porose, squamigerous. 



I J XIL LUNULAEIA. 



1^ Thallus rigid, indistinctly porose. XL Aitonia. 



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

 j^ J costa. VIIL Dumortieea. 



1^ Androecium ( so far as known ) sessile L 



( Thallus very indistinctly porose. VIL Asterella. 



( Thallus clearly porose M 



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

 ]\^ J Grimaldia. 



t Carpocephalum 2-4 divided to base. IIL Sauteria. 



T. MAROHANTIA 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 re volute segments or teeth. Spores smooth. Ela- 

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

 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 AlarrJiaut, a French botanist, 

 d. 167.S. 



