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THE SEAWEEDS. 
A.— CLASSIFICATION ACCORDING TO RANDOLPH TAYLOR 
(1922). 
(A) PHAEOSPORALES. — Gametes isogamous or anisogamous. Three 
sub-orders. 
(i.) Ectocarpineae. — Morphological alternation of similar 
generations shown or inferred to be present. Eight 
families. 
Ectocarpaceae, e.g., Ectocarpus. 
Tilopteridaceae. 
Sphacelariaceae, e.g., Sphacelaria , Cladostephus. 
Asperococcaceae, e.g., Asperococcus, Scytosiphon. 
Chordariaceae. 
Desmarestiaceae. 
Stilophoraeeae. 
Ralfsiaceae. 
(ii.) Dictyosiphonineae. — Morphological alternation of dis- 
similar generations present or inferred, the sporophyte 
exceeding the gametophyte in size. 
Dictyosiphonaceae. 
(iii.) Cutlerineae. — Morphological alternation of similar or 
dissimilar generations present or inferred, with gameto- 
phyte, when different, larger than the sporophyte. 
(B) CYCLOSPORALES. — Plants of this order strictly oogamous. 
(i.) Dictyotineae. — Morphological alternation of similar gene- 
rations. 
Dictyotaceae, e.g., Dictyota, Zonaria. 
(ii.) Laminarineae. — Morphological alternation of dissimilar 
generations with gametophyte smaller than sporophyte. 
Laminariaceae, e.g., Ecklonia. 
(iii.) Fucineae. — Alternation of generations reduced to cyto- 
logical. 
Fucaceae, e.g., Sargassum, Hormosira. 
B.— CLASSIFICATION ACCORDING TO SETCHELL AND 
GARDNER (1925) (MELANOPHYCEAE (PHAEOPHYCEAE)). 
(A) PHAEOSPOREAE. — Reproducton both sexual and asexual, but 
aplanospores unknown ; typically unilocular zoosporangia and 
plurilocular gametangia present. 
(i.) Sphacelariales. 
Sphacelariaceae, e.g., Sphacelaria. 
Cladostephaceae, e.g., Cladostephus. 
Stypocaulaceae, e.g., Stypocaulon. 
