THE MAEINE ALGM OF NEW ENGLAND. 201 



PLATE X. 



J. H. Blake and W. G. Farlow. 



Fig. 1. Spyridia fllamentosa, Haxv. ; axis with branch bearing antheridia, a. 

 200 diam. 



2. Callitliamnion corymbosum, Lyngb. ; branch with antheridia. 200 diam. 



3. Treniepohlia virgatula, Harv. ; showing the undivided spores, a, a. 200 diam. 



4. Griffith&ia Bornetiana, Farlow ; tip of male plant with antheridia. 400 diam. 



5. The same ; portion of tetrasporic plant with tetraspores, a, and involucre, b. 



200 diam, 



PLATE XL 



J. H. BlaJce and W. G. Farlotv. 



Fig. 1. Callithamnion Bailey i, Harv. ; plant with tetraspores: a, before separation from 

 the mother-cell ; a, free from the mother-cell. 200 diam. 



2. The same ; plant bearing binate cystocarp. 



3. GriffitJma Bornetiana, Farlow; plant bearing cystocarp (favella). 200 diam. 



PLATE XII. 



J. H. BlaTce and W. G. Farlow. 



Fig. 1. Nemalion nmltifidum, Ag. ; dissection of outer part of the plant to show the 

 cystocarp. 400 diam. 

 2. Spyridia filamentosa, Harv. ; tip of female plant with a double cystocarp, the 

 right-hand portion of figure representing the cystocarp and branch in sec- 

 tion ; the left-hand cystocarp being seen superficially. 400 diam. 



PLATE XIII. 



J. H. Blake and W. G. Farlow. 



Fig. 1. Polysiphonia Olneyi, Harv. ; branch with antheridium, a. 200 diam. 



2, 3, and 4. Grinnellia Americana, Harv. : Figs. 3 and 4 represent the antheridia 

 seen from above and in section, a; Fig. 2, section through a cystocarp. 400 

 diam. 



PLATE XIV. 



J. H. Blake and W. G. Farlow. 



Fig. 1. Petrocelt8 cruenta J. Ag. ; dissection of frond showing the tetraspores, a, d. 400 

 diam. 

 2. Bhaodonia tenera, J. Ag. ; transverse section of frond showing cystocarp and 

 carpostome. 200 diam. 



PLATE XV. 



J. H. Blake and W. G. Farlow. 



Fig. 1. Ba»ya elegans, Ag. ; branch with stichidium bearing tetraspores. 300 diam. 



2 and 5. Champia parvula, Harv. : Fig. 5, portion of frond bearing a cystocarp, o; 



slightly enlarged ; Fig. 2, section through a, showing arrangement of spores, 

 carpogenic cell, and carpostome. 400 diam. 



3 and 4. Polysiphonia Harveyi, Bail. : Fig. 4, branch with cystocarp ; Fig. 3, sec- 



tion through the same, showing spores and carpogenic cell. 400 diam. 



