250 



Alexander IV. Evans, 



the marginal cells and the cells which adjoin them. To M. 

 polymorpJia he assigns appendages which are minutely but 

 sharply denticulate, and adds that the cells gradually increase in 



Fig. 



Marchantia Berteroana Lehm. & Lindenb. 



Appendages of ventral scales and other anatomical details. A-D. 

 Appendages of ventral scales, x 100: D represents the basal portion of 

 an appendage ; the other figures represent apical portions. E, F. Epi- 

 dermal pores of thallus, surface view, x 225. G. Pore in cross-section, 

 X 225. H-J. Inner openings of pores, x 225. K. Stalk of female 

 receptacle, cross-section near base, x 40. A. Juan Fernandez, G. T. 

 Hastings 218. B, E, G, H. Chile, R. Thaxter 66. C, D. Cape Colony, 

 Capt. Rabcnhorst. F, I-K. Australia, F. von Miiller. 



size in passing from the margin to the median portion. In most 

 cases the distinctions given by Schiffner apply very definitely, but 

 in the forma aquatica of M. polymorpha (Fig. i, E, F) the 

 appendages are usually destitute of distinct denticulations, the 



