EXPLANATION OF PLATES 



PLATE 83 



Marchantia Setchellii sp. nov. 



(W. H. P., ad nat. del.) 



Figs. 1 and 2. Frond, nat. size. 



Fig. 3. Cross-section of frond, X 24. 



Fig. 4. Cells near margin of frond, X 260. 



Fig. 5. Median-scale, X 50. 



Figs. 6, 7. Appendages, X 120. 



Fig. 8. Mouth of stomata, X 260. 



Fig. 9. Portion of fringe of cupule, X 120. {Marchantia subandina Spruce). 



Fig. 10. Cross-section of frond, X 24. 



Figs. 11, 12. Appendages, X 50. 



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