the algae of bermuda. 41 



Family TREXTEPOHLIACEAE. 

 Trentepohlia Martius. 



*T. aurea (L.) Martius, 1817, p. 351; Collins, 1909, p. 316; Bijssus 

 aureus Linnaeus, 1753, p. 1168. Common on shaded cliflFs all over 

 the islands, forming little orange-colored tufts of soft filaments, some- 

 times confluent and covering considerable spaces. 



Family CLADOPHORACEAE. 

 Chaetomorpha Kiitzing. 



1. Filaments under 100 ^u diam. 

 1. Filaments over 100 ^ diam. 



2. Filaments attached, not over 25 /j. diam. 



2. Filaments not attached, 40-70 ^ diam. 

 .3. Filaments 500 /j. diam. or more. 

 3. Filaments 400 fj. diam. or less. 



4. Light green; filaments 200-2.50 ju diam. 



4. Dark green; filaments 125-175 m diam. c 



1. C. mimima sp. nov.; Plate I, figs. 5-7; P. B.-A., No. 2007. 

 Filamentis disco affixis, cylindricis vel plus minusve clavatis, 10-20 (jl 

 diam., ad nodos interdum constrictis; cellulis 2-4 diam. longis, 

 membrana crassa distincte laminata; zoosporis (?) in qua vis cellula 

 formatis, per foramine laterale liberatis. 



Filaments attached bv a disk, cvlindrical or more or less clavate, 

 10-20^1 diam., nodes sometimes constricted; cells 2-4 diam. long, 

 wall distinctly laminate; zoospores (?) formed in any cell, escaping 

 by a lateral opening in the wall. On fronds of Codium, Cladojihora etc. 



The smallest species yet known in this genus; C. calif ornica Collins, 

 P. B.-A., No. 664 was the smallest heretofore known in the attached 

 state, and its filaments average about twice the diameter of the present 

 species; as regards length, the contrast is even more striking, as in C. 

 calif ornica the fronds reach a length of a decimeter, while in C. minima 

 5 mm. is the longest observed. It was first found growing on the 

 rounded ends of the utricles of Codium tomejitosum, sometimes singly, 

 sometimes many individuals close together. Being quite imper- 



