THE ALGAE OF BERMUDA. 41 



FAMILY TRENTEPOHLIACEAE. 

 TRENTEPOHLIA Martius. 



*T. AUREA (L.) Martius, 1817, p. 351; Collins, 1909, p. 316; Byssus 

 aureus Linnaeus, 1753, p. 1168. Common on shaded cliffs 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 M diam. 2. 



1. Filaments over 100 n diam. 3. 



2. Filaments attached, not over 25 /u diam. 1. C. minima. 



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



3. Filaments 500 n diam. or more. 5. C. crassa. 



3. Filaments 400 fj. diam. or less. 4. 



4. Light green; filaments 200-250 /j. diam. 4. C. Linum. 



4. Dark green; filaments 125-175 M diam. 3. C. brachygona. 



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 (j, 

 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 by a disk, cylindrical or more or less clavate, 

 10-20 yu 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, Cladopkora 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. 

 californica 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 tomentosum, sometimes singly, 

 sometimes many individuals close together. Being quite imper- 



