334 Williams: Peruvian mosses 



Brachythecium stereopoma (Spruce) Jaeg. 



San Miguel, on live wood, 1,830 m., July, 191 1, Foote 48. 

 Rhynchostegium aquaticum (Hampe) Jaeg. 



Urubamba, in water, 2,900 m., July, 191 1, Foote 43; Arequipa, 

 in water, June, 191 1, Foote 44; Cuzco, on wet rocks, July, 191 1, 

 Foote 45. • 



Rhynchostegium conoph\t.lum (Tayl.) Jaeg. 



Urubamba, on rock, 2,900 m., July, 1911, Foote 46; San Miguel, 

 on live wood, 1,830 m., July, 191 1, Foote 47. 



New York Botanical Garden 



Hxplaiiatioii of plates 17-20 



Plate 17 



Leptodontium integrifoliiim. i. Plant about natural size. 2. Perichaetium, 

 X 7. 3. Stem-leaf, X 15. 4. One Fide of base of leaf, X 115. 5. Median cells 

 of leaf , X 240. 6. Apex of leaf. X 50. 7. Cross-section of leaf, X 150. 



Globulina peruviana. 8. Plant about natural size. 9. Plant, X 10. 10. Stem- 

 leaf, X 45- II. Apex of costa and leaf, X 230. 12. Median cells of leaf. X 230. 

 13. Basal cells on one side of costa, X 230. 14. Cross-section of stem, X 230. 

 15. Cross-section of leaf, X 230. 



Plate 18 



Tortilla lacerifolia. i. Plant about natural size. 2. Perichaetial leaf, X 25. 

 3. Upper stem-leaf, X 25. 4. A segment from the leaf-margin, X 130. 5- Base 

 of leaf on one side of costa, X 180. 6. Cross-section of leaf, X 180. 



Hygrohypnum peruviense. 7. Plant about natural size. 8. Cross-section of 

 stem, X 130. 9. Basal leaf-cells on one side of co£ta, X 270. 10, 11. Stem-leaves, 

 X 25. 12. Median leaf-cells, X 270. 



Plate 19 

 Grimmia rivulariopsis. 1. Fertile and male plant about natural size. 2. Cap- 

 sule, seta and perichaetial leaf, X 20. 3. Calyptra, X 20. 4. Lid, X 20. 5. Part 

 of peristome and rim of capsule, X no. 6. Antheridia with leaf, X 20. 7. Upper 

 part of stem leaf, X 180. 8. Stem-leaf, X 18. 9. Median cells of leaf, X 180. 

 10. Cells in lower part of perichaetial leaf, X 180. 11. Perichaetial leaf, X 18. 

 12. Median e.xothecal cells, X 180. 13. Cross-section of stem-leaf, X 180. 



Plate 20 

 Bryum biforme. i. Fertile and male plant about natural size. 2. Male 

 plants, X 20. 3. Capsule, moistened, X 8. 4. Upper stem-leaf, X 16. 5. Outer 

 perichaetial leaf, X 16. 6. Upper part of stem-leaf, X i35- 7- Border of leaf and 

 adjoining cells about half way down, X i35- 8. Inner perichaetial leaf, X 16. 

 9. Stoma, X 135. 10. Median exothecal cells, X I3S- H- Part of peristome, 

 annulus and rim of capsule, X 100. 



