American Species of Marchantia. 



309 



Fig. 20. Marchantia chenopoda L. 



Anatomical details. A. Cells from compact ventral tissue in cross- 

 section, including two sclerotic cells and a cell containmg oil-bodies, x 100. 

 B. Cells from same tissue in longitudinal section, mcludmg a sclerotic 

 cell X 100. C-E. Cells from basal portions of median scales, x 100. 

 F. Stalk of male receptacle, cross-section, x 50. G-I. Stalks of female 

 receptacles, cross-sections, x 50: G, showing a stalk of average size; H, 

 a slender stalk near the middle; and I, the same slender stalk near the 

 base. J-M. Portions of involucres: J, x 40; L-M, x 100. A-b, J. 

 Jamaica, A. W. Evans 405, W. R. Maxon 880. H, I. Panama, K.^. 

 IVilliams 1084. K. Vera Cruz, Barnes & Land 631. L. Costa Kica, 

 Cook & Doyle 301. M. Bolivia, R. S. Williams 2143. 



