LIST OF PLATES. 



XV 



3. Ptilota plumosa. 



3 a, comb-like brancMet. 

 3 b, spore-clusters. 



PLATE XIII. 



1. Desmarestia aculeata. 



1 a, branchlet of a young 



frond. 



2. Cladostephus verticillatus. 



2 a, whorls of branclilets. 

 2 b, branchlets. 



2 c, branclilets with spores. 



3. Ulva latissima. 



3 a, cellules of upper layer 



of frond. 



PLATE XIV. 



1. Sporochnus pendunculatus. 



1 a, a mature receptacle. 



2. Codiurn bursa. 



2 a, fibres of frond. 



3. Enteromorpha intestinalis. 



3 a, small portion of frond. 



4. Calothrix confervicola (on 



Ceramium rubram). 



4 a, proliferous thread. 



4 b, spores. 



4 c, portion of thread. 



PLATE xv. 



1. Striaria attenuata. 



1 a, part of a branch with 



spores. 



2. Cladophora lsetevirens. 



2 a, part of a branch. 



3. Cladophora lanosa. 



3 a, part of a branch. 



4. Chsetomorpha Melagonium. 



4 a, cells of thread. 



PLATE XVI. 



1. Bryopsis plumosa. 



la, & plumule. 



2. Enteromorpha compressa. 



2 a, part of a frond. 



3. Cladophora falcata. 



3 a, branch. 



