(256) 
Stipulodes 0.6-1.1 mim. long. 
Odspores with 8 or g striae. 
16. C. Morongit. 
Odspores with rr or 12 striae. 
17. C. Schneckit. 
Stipulodes 1.75-3 mm. long. 
O 
éspores with 8 striae. 18. C. coronatiformis, 
Odspores with 6 piel 19. C. Curtissii. 
Stipulodes 3.5-8 mm. long. 20. C. longifolia. 
Plants somewhat ere aces grayish. 
. C, keukensis. 
Leaves more or less corticated, the aaa internode excepted. 
Leaves with one corticated internode. 
Stipulodes 0.2-0.25 mm. long. 22. C. mexicana. 
Stipulodes 0.8-1.1 mm. long. 17. C. Schneckit. 
Leaves with more than one corticated internode. 
Odspores 0.4 mm. long. 23. C. Liebmanni, 
Odspores 0.5 mm. long. 24. C. Robbinsiz. 
Dioecious. 
Spine-cells very short, confined to has stem-internodes. 
. longifolia. 
Spine-cells conspicuous on all Pree eee 
Leav over 2.5cm.long. 25. C. Loricmaunis 
26. C. Nordhoffiae 
Stems usually very regularly triply corticated ; stipulodes forming a 
ouble whorl. 
Leaves entirely uncorticated. 
Posterior bracteoles not greatly reduced. 
34. C. inconstans. 
Posterior bracteoles greatly reduced. 37. C. guatemalensis. 
Leaves, or at least the lowest leaf-internodes, doubly corticated. 
Monoecious. 
Odspores brown. 27. C. leptosperma. 
OGspores black. 
Primary and secondary cortical cells of a size ; no 
spine-cells, Sepiites rar’ 28. C. 
Primary cells larger than ee apine- -cells or at 
least papillae present. 29. verrucosa. 
Dioecious. 
Spine-cells well developed; posterior leaflets moderately 
deve 0. C. as; 
elope 3 pera. 
No spine-cells ; ; posterior leaflets greatly reduced. 
31. C. Macounii. 
Leaves, at least some of them, triply corticated, at least in part; 
the lowest leaf-internode always uncorticated 
Antheridia and odgonia borne at the same nodes. 
Leaflets at the lowest leaf- ie see to ovate, not ven- 
tricose, similar to the other: 
