American Species of MarcJiantia. 



257 



Oaxaca: near Oaxaca, Sommerschii (the type-locality); 

 Chinantla, F. Liehmann f listed by Gottsche in Mex. Leverm. 

 1863). 



It has already been noted that M. paleacea was distinguished 

 by the Florentine botanist Micheli as long ago as 1729. His 



Fig. 6. Marchantia paleacea Bertol. 



Ventral scales, x 27. A-G represent median scales (with appendages) ; 

 H-0, laminar scales (without appendages). A-D, H-J. Italy, F. A. 

 Artcria, in V. Schiffner's Hep. Europ. Exsic. 13. E, K. Vera Cruz, 

 Barnes & Land 668. F, L. Cuba, C. Wright, in Hep. Cubenses, as M. 

 domingcnsis. G, M-0. Java, V. Schiffner, in Iter Ind. ^9, as M. nitida. 



figure brings out clearly the general habit of the plant and many 

 of the features of the cupules and female receptacles. The rays 

 of the latter are shown to be flat at their extremities, and the 

 center of the disc is marked by a distinct rounded elevation. In 

 the only receptacles where the rays can be counted ten or eleven 

 are represented, but one receptacle in profile shows only four 

 rays, indicating that sometimes at least fewer than ten rays were 

 present in the material figured. It is now admitted that the 



