GENUS II. TOLYPELLA. A. Braun. 



Leaves with 1-3 nodes developing leaflets, and, usually, with 

 many-segmented tips above the nodes. 



Leaflets not equalling the primary ray in size, many-celled, 

 sometimes also provided with leaf-bearing nodes. 



ANTHERIDIA, single or numerous, LATERAL on the nodes of the leaf 

 and in the base of the verticil, within the leaves, mostly with elon- 

 gated stipe. Sporophydia surrounding the Antheridia in large 

 numbers, on the nodes of the leaf and in the base of the verticil; 

 also, at times, with elongated stipe. Usually the fruit-bearing 

 leaves are contracted and form densely interwoven nests. 

 * Dioecious. 



1. T. Hispanica Ndst. ined. 

 * * Monoecious. 



I. OBTUSIFOLIA. Coronula evanescent. Sterile leaves undivided. 



A. Ultimate cell of the primary ray of the leaf longer than the 



other cells. 



2. T. longicoma A. Br. 



B. Ultimate cell not longer. 

 f Leaflets attenuate. 



3. Marine. Nucleus, 370-500 long. T. nidifica Leonh. 



(Europe). 



4. Submarine. Nucleus, 300-340 long. T. Normaniana 



Ndst. (Europe). 

 f"f Leaflets not attenuate. 



5. Saline. Nucleus, 300-360 long. T. glomerata Leonh. 



6. Fresh water. Nucleus, 425-475 long, maturing in fall. 



T. comosa Allen. 

 II. ACUTIFOLIA. Coronula persistent. (Sub-persistent in No. 12.) 



A. Indivisa. Sterile leaves undivided. 



7. Nucleus, 350-375 long. Leiopyrena. T. prolifera 



Leonh. 



8. Nucleus, 425-450 long. Oxygyra. T. fimbriata Allen. 



B. Divisa. Sterile leaves divided (usually into four terminal 



leaflets). 



\ Attenuata. Leaflets attenuate. 

 Secondary ray undivided; sterile. 



9. Nucleus, 285-355 ; rays, 4-7-celled. T. Californica 



A. Br. 

 10. Nucleus, 330-340 ; rays, 3-4-celled. T. stipitata 



Allen. 

 Secondary rays divided; fertile. 



