PLATE II. 



A. PYCNOPHYCUS, page 18. 



Fig. 1, P. tuberculatus ; the natural size. 2, part of 

 cross section of a receptacle. 3, a spore ; magnified. 



B. HIMANTHALIA, page 20. 



Fig. 1, H. lorea ; young and full-grown plants. 2, 

 part of cross section of a receptacle. 3, a spore, 

 containing four sporules ; magnified. 



