THE GREEN ALGAE OF NORTH AMERICA 73 



3. C. OVALE G. M. Smith, 1916, p. 471, PI. XXIV, fig. i. 

 Thallus of 5-20 cells, epiphytic on filamentous Chlorophyceae ; 

 gelatinous sheath indistinct ; cells ovoid, with 2 parietal chro- 

 matophores each containing a pyrenoid ; sheath at base of setae 

 conspicuous. Cells 20-22 X 13-15 p- ', setae about 125/1; basal 

 sheath 3-5 p. Wis., G. M. Smith. 



Page 282, after description of ACROCHAETE PARASITICA, add, 



CHABTONEMA Nowakowski, 1877, p. 75. 

 Frond filiform, branching, bearing long, inarticulate bristles 

 with somewhat swollen bases ; cell division intercalary and 

 terminal ; chromatophore disk-shape, parietal, with i or more 

 pyrenoids. Asexual reproduction by zoospores formed 2 ill a 

 cell, with 4 cilia and contractile vacuole, without stigma. 



Only one species. 



C. iRREGuivARE Nowakowski, 1877, p. 75 ; Huber, 1892, p. 

 302, PI. XII ; P. B.-A., No. 2137. Cells 9-15 ft diam., 2-4 diam. 

 long ; bristles 4-5 /* diam. at base. In gelatinous coating of 

 Batrachospermum, Tetraspora, etc. Fig. 20. Mass. Europe, 



PHAEOPHILA Hauck, 1876, p. 57. 



Articulate filaments epi- or endophytic, each cell bearing 1-3 

 long, inarticulate hairs, continuous with the cell, and not 

 dilated at the base. Reproduction by zoospores. 



P. FLORIDEARUM Hauck, 1876, p. 57; 1885, p. 464, fig. 2OO. 



In various loose-tissued algae ; cells of irregular form, 12-40 /i 



diam. Fig. 23. Bermuda. Europe. 



Page 288, after the description of genus PRINGSHEIMIA, add, 



KEY TO THE SPECIES OF PRINGSHEIMIA. 



i. Median cells usually taller than their diam. ; cells not showing dis- 

 tinct radial or zonate arrangement. i. P. sen fata. 



i. All vegetative cells broader than high; radial and zonate arrange- 

 ment of cells distinct. 2. P. Udotae. 



After description of P. SCUTATA, add, 



2. P. (?) UDOTAE Borgesen, 1913, p. n, fig. 3. Vegetative 

 cells mostly elongate towards the margin, 17-70 \i. long, average 

 40 p. ; 5-25 n wide, average 16 /* ; 10-12 p. thick ; except in center 

 of frond in distinct dichotomous radiating series, and often 

 showing concentric arrangement ; sporangia formed in central 

 part of the disk, which elongates vertically ; zoospores dis- 

 charged through a neck-like papilla. On Udotea Flabellum, 

 Virgin Islands, Borgesen, who places it in this genus with 

 some doubt. 



