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Evans: HepaticaE or Puerto Rico 563 
Explanation of Plates 
PLATE 20 
Harpalejeunea subacuta Evans, 1. Part of plant with perianth, postical view, 
X40. 2. Part of sterile stem, antical view, X 40. 3. Cells from middle of lobe, 
X 360. 4. Cells from antical margin of lobe, X 250. 5-7. Apices of lobes, 250, 
8. Base of lobe, showing ocelli, 250. 9. Apex of lobule, & 250. 10. Underleaf, 
250. 11. Bracts and bracteole, 40. The figures were all drawn from the type- 
specimens. 
Hlarpalejeunea uncinata Steph. 12. Part of plant with Q inflorescence, postical 
view, X40. 13. Part of sterile stem, antical view, < 40. 14. Perianth with in- 
volucre, postical view, 40. 15. Cells from middle of lobe, x 360, 16. Cells from 
_antical margin of lobe, < 250. 17. Apex of lobe, 250. 18. Base of lobe, show- 
ing ocelli, 250. 19. Outer portion of lobule, & 250. 20. Underleaf, 250. 21. 
Bract and. bracteole, X 40. 22. Bract, 40. 23. Cells from margin of bract, 
X 250. 24. Cells from upper part of perianth-keel, x 250. The figures were all 
drawn from specimens collected by A. A. Heller (no. 4763). 
PLATE 21 
Harpalejeunea heterodonta Evans. 1%. Part of stem with branch, postical view, 
35. 2. Branch, antical view, < 35. 3. Cells from middle of lobe, X 310. 4. Cells 
from antical margin of stem-leaf, 220. 5. Tooth from antical margin of branch-leaf, 
X 220, 6. Apex of lobe, 4 220. 7. Base of lobe, < 220. 8. Apex of lobule, > 220. 
9. Underleaf, x 220. The figures were all drawn from the type-specimens. 
Cyrtolejeunea holostipa (Spruce) Evans. 10. Part of stem with branch, antical 
view, X55. 411. Part of stem, postical view, X55. 12. Part of stem with perianth, 
postical view, X55. 13. g inflorescence, postical view, X55. 14, 15. Cells from 
middle of lobe, showing variations in thickness of cell-wall, < 310. 16. Apex of 
lobe, 310. 17. Base of lobe, 310. 18, 19. Apices of lobules, showing variation 
in thickness of cell-wall, < 310. 20. Underleaf, 310. 21. Apex of aberrant under- 
leaf, 310, 22. Bract, X55. 23. Bracteole, < 55. Figs. 12, 13, 22 and 23, were 
drawn from specimens distributed by Spruce in Hepatic ae Spruceanae (set belonging to 
the New York Botanical Garden); the remaining figures were drawn from specimens 
collected by the writer (nos. 21 and 46). 
PLATE 22 
Euosmolejeunea trifaria (Nees) Schiffn. x1. Leaf, antical view, X 35- 2. Cells 
from middle of lobe, > 310. 3. Same in cross-section, 220. 4. Cells from anti- 
cal margin of lobe, < 220. 5. Lobule, X 35. 6. Apex of lobule, X 220. 7. Un- 
derleaf, X 35. 8-10. Apices of divisions of underleaves, X 220. The figures were 
all drawn from specimens collected by the writer (no. 33). 
Trachylejeunea Aquarius (Spruce) Evans, 11. Part of plant with 3 branches 
and perianth, the subfloral innovation poorly developed, postical view,  35- 12. 
Part of sterile branch, postical view, X 35. 13. Leaf, X 35- 14. Cells from middle 
of lobe, X< 220, 15. Same in cross-section, X 220. 16. Cells from antical margin 
of lobe, ¢ 220. 17. Basal part of lobe, showing three ocelli, X 220. 18. Apex of 
lobule, < 220. 19. Apex of one of the divisions of an underleaf, < 220. 20, 21. 
Bracts, S¢ 35. 22. Bracteole, x 35. The figures were all drawn from specimens 
collected by A. A. Heller (no. 4745). 
