186 BOTANICAL GAZETTE [MARCH 
Fic. 14. Pneumatic tissue of leaf, viewed en jace. X240. 
Fic. 14B. Glandular hair from base of petiole. 240. 
PLATE VIII 
Diodia teres 
Fic. 15. A seedling; cot, cotyledons; h, hypocotyl; r, primary root. X2. 
Fic. 16. A cotyledon with stipule. 
Fic. 17. Transverse section of leaf, showing epidermis of upper face with 
protuberances of outer cell wall. 240. 
Fic. 18. Epidermis of leaf margin. 240. 
Fic. 19. Epidermis of lower face of leaf. x 240. 
Fic. 20. Epidermis of upper face of leaf, showing stomata. 240. 
Fic. 21. Cross-section of stem internode, showing endodermis (end) and 
cortex (c). 240. 
Galium pilosum 
Fic. 22. A seedling; index letters as in fig. 15. 2. 
Fic. 23. A cotyledon. 
Fic. 24. Hair from stem. 240. 
Fic. 25. Epidermis of lower face of leaf, showing stomata and a secretory 
cell with cuticular striations. 240. 
G, triflorum 
Fic. 26. Epidermis of lower face of leaf, showing stomata and undulate 
lateral cell walls. x 320. 
Fic. 27. Transverse section of leaf, showing epidermis and a stoma from 
lower face of blade. X 320. 
PLATE IX 
Fic. 28. A seedling: index sis as in fig. 15. X2. 
Fic. 29. Hair from midrib. 240. 
Fic. 30. Transverse section of ventral portion of leaf; ep, epidermis; ™, 
mesophyll without palisade. x 320. 
G. circaezans 
Fic. 31. Epidermis from lower face of leaf, showing a secretory cell with 
no cuticular striae. 240. 
Fic. 32. Cross-section of leaf; ep, epidermis; #, palisade tissue. X 320. 
Fic. 33. Pneumatic tissue viewed en face. X 320. 
Fic. 34. Cross-section of internode, showing one wing; e?, epidermis; coll, 
collenchyma; ¢, cortex. X 320. 
G. latifolium 
Fic. 35. Cross-section of basal (but aerial) internode, showing one of the 
angles; index letters as above. X 320. 
Fic. 36. Cross-section of subterranean internode of an over-wintering shoot; 
index letters as above. X 320. 
