128 



Alexander W. Evans, 



Figure 2. Riccardia Thaxteri Evans 



A. Plant showing prostrate portions with stolons and three photo- 

 synthetic branch-systems with one female branch, x 4. B. PhotosjTithetic 

 branch-system with numerous male branches, x 8. C. Transverse section 

 of axis, lower part, x 100. D. Transverse section of axis, upper part, 

 X 100. E. Longitudinal section of axis, upper part, x 100. F. Trans- 

 verse section of stolon, x 100. G. Transverse section of ultimate branch, 

 X 100. H. Apex of ultimate branch, surface-view, x 100. I. Female 

 inflorescence, x 40. The figures were all drawn from the type specimen. 



