94 BRITISH CHAKOPHYTA. 



Monoecious. Lowest branclilet-segment without 



ascending cortex. 



Spine-cells and stipulodes short, somewhat 

 blunt, posterior bract-cells rudimentary. 

 Cortex developed . . . 7. C. contraria. 

 Cortex rudimentary, or only partially de- 

 veloped . . . . 8. C. denudata. 

 Spine-cells and stipulodes long and acute, 



posterior bract-cells developed. 

 Primary cortical-cells scarcely the more 

 prominent, secondary cells not over- 

 lapping. 

 Cortex regular, spine-cells solitary 



9. C. baltica (type). 

 Cortex irregular, spine-cells 2-3 together 



9. C. baltica var. affinis. 

 Primary cortical-cells much the more 

 prominent, spine-cells very long, fas- 

 ciculate. Cortex irregular, secondary 

 cells often overlapping 10. C. aculeolata.* 

 Stem cortex triplostichous, i. e. having three rows 

 of cortical cells to each branchlet, a central 

 (primary) and two lateral (secondary). 

 Dioecious. 



Spine-cells developed, usually long and con- 

 spicuous. Root producing globular bulbils. 

 Spine-cells solitary . . . 11. C. aspera. 



Spine-cells fasciculate . . 12. C. desmacantha.^ 

 Spine-cells rudimentary. 



Branchlets of male plant strongly connivent. 

 Branchlets of 8-9 segments. Root not 

 producing bulbils . . 13. C. connivens. 

 Branchlets of male plant not strongly con- 

 nivent. Branchlets of 9-13 segments. 

 Root producing large composite bulbils 



14. C. fragifera. 

 Monoecious. 



Primary and secondary cortical-cells of about 

 equal diameter and prominence. Stipulodes 

 and spine-cells rudimentary . . 15. C.fragilis. 

 Primary cortical-cells larger and more pro- 

 minent. Stipulodes and spine-cells more 

 or less developed . . 16. C. delicatula. 



* C. aculeolata Kutzing = C. polyacantha Bratin. 



t C. desmacantha sp. nov. = C. aspera, var. desmacantha H. & J. Groves, 

 - ; Journal of Botany/ xxxvi, p. 410, t. 391 (1898). 



