American Species of Marchantia. 



267 



Fig. 9. Marchantia breviloba Evans 

 Plants, natural size, and various anatomical details. A. Male plant, x i. 

 B. Female plant, x i. C-E. Appendages of ventral scales, apical por- 

 tions X 100. F. Epidermal pore of thallus, surface view, x 225. U 

 Pore in cross-section, x 225. H. Inner opening of pore, x 225. 1, J. 

 Stalk of male receptacle, cross-sections, x 40; I was cut near base, j, 

 near apex. K. Stalk of female receptacle, cross-section, cut near base. 

 A. Jamaica, W. R. Maxon 1115. B-D, F-K. Jamaica, A. W. Evans 175, 

 type. E. Jamaica, A. W. Evans, 203. 



