PLATK VI. 



A. CuTLERiA, page 35. 



Fig. 1, C. midtifida ; the natural size. 2, a morsel 

 of the frond with a sorus. 4, antheridia. 5, trans- 

 verse, and 6, longitudinal, sections of the frond ; 

 magnijied. 



B. Haliseris, page 36. 



Fig.\, H.polypodioides ; ihe natural size. 2, morsel 

 of the frond with scattered spores. 3, small portion 

 with sorus. 4, spores ; magnijied. 



C. Padina, page 37. 



Fig. 1, P. Pavonia; the natural size. 2, a sorus. 3, 

 spores. 4, circinate apex of the frond, with fringe ; 

 magnijied. 



D. ZoNARiA, page 38. 



Fig. 1, Fronds of Z. parvula, on a piece of Nullipore. 

 2, portion of the frond. 3, cellular structure of the 

 surface ; magnijied. 



