PLATE X. 



A. CHORDARIA, page 46. 



Fig. 1, C. jiagelliformis ; the natural size. 2, seg- 

 ment of a cross section of the frond. 3, longitudinal 

 slice. 4, spore and paranema ; magnified. 



B. MESOGLOIA, page 47. 



Fig. 1, M. virescens ; the natural size. 2, small por- 

 tion of the frond. 3, filaments from the same ; mag- 

 nified. 



C. LEATHESIA, page 48. 



Fig. 1, L. tuber if or mis ; the natural size. 2, vertical 

 section of the same ; magnified. 3, L. Berkeleyi ; 

 the natural size. 4, filaments from the same ; rnag- 



D. RALFSIA, page 49. 



Fig. 1, R. deusta ; the natural size. 2, vertical sec- 

 tion of frond, with sori. 3, filaments composing the 

 periphery of the frond. 4, spore and paranemata 

 from a sorus ; magnified. 



E. MYRIONEMA, page 51. 



Fig. 1, M. punctiforme, growing on Ceramium rubrum; 

 the natural size. 2, a plant of the parasite on a 

 joint of the Ceramium. 3, spores and filaments ; 

 magnified. 



F. ELACHISTEA, page 49. 



Fig. 1, E.fucicola, growing on Fucus vesiculosus ; the 

 natural size. 2, a small part of the parasite, showing 

 a dichotomous filament from the tubercle ; the fila- 

 ments or paranemata of the spores ; the spores, and 

 the bases of the long, free filaments, all in situ. 3, 

 spore and paranemata ; magnified. 



