(148) 



Fig. 3. One half cross section of leaf, X 285. 



Fig. 4. Marginal cells y z down leaf, X 285. 



Fig. 5. Upper part of stem, about natural size. 



Fig. 6. Apex of leaf, X 80. 



Plate 23. Brachythecium petrophilum. 

 Fig. 1. Plant, about natural size. 

 Fig. 2. Stem leaf, X 4°- 

 Fig. 3. Branch leaf, X 40- 

 Fig. 4. Perichaetial leaf, X 4°- 

 Fig. 5. Capsules, X 9- 

 Fig. 6. Part of peristome, X 160. 

 Fig. 7. Part of annulus, X 160. 

 Fig. 8. Alar cells, X 160. 

 Fig. 9. Apex of leaf, X 285. 



Fig. 10. Exothecal cells near middle of capsule, X T 6o- 

 Fig. 11. Stoma. 



Fig. 12. Section of pedicel near middle, showing papillae, X 285. 

 Fig. 13. Median leaf-cells, X 285. 



Plate 24. Harpidium amblyphyllum. 



Fig. 1. Stem leaf, X 12. 



Fig. 2. Branch leaf, X I2 - 



Fig. 3. Capsules, X 10. 



Fig. 4. Perichaetial leaf, X I2 - 



Fig. 5. Apex of stem leaf, X 285. 



Fig. 6. Cross section of stem, X I &°- 



Fig. 7. Part of peristome, X J 6o. 



Fig. 8. Median leaf-cells, X 285. 



Fig. 9. Base of leaf on one side, X 285. 



Fig. 10. Stoma, X 160. 



3. An Enumeration of the Pteridophytes Collected by~R. S. Williams 



and J. B. Tarleton. 



By Iv. M. Underwood. 



Family Ophioglossaceae. 

 Botrychium JLunaria L. Dawson (Williams). 



Family Polypodiaceae. 



Polyfiodium vulgare L. Skagway (Williams) ; 50 miles 

 above Stewart River (Tarleton). 



Filix fragilis (L.) Under w. {Cy stopfer is fragilis Bernh.) 

 Dawson and near mouth of the Klondike (Williams) ; 50 

 miles above Stewart River (Tarleton). 



