1920] Setchell-Gardner : ChloropJiyceae 169 



Gardner, New Pac. Coast Mar. Alg. IV, 1919, p. 489, pi. 42, f. 10, 

 11. C odium adhaerens Anderson, List of Calif. Mar. Alg'., 1891, p. 

 217 ; Howe, A month on the shores of Monterey Bay, 1893, p. 63 ; 

 McClatchie, Seedless Plants, 1897, p. 351; Saunders, Four Siphon. 

 Alg., 1899, p. 2, pi. 350, f . 3 a, b, c, Alg. Harriman Exp. 1901, p. 416 ; 

 Setchell and Gardner, Alg. N. W. Amer,, 1903, p. 231 ; Collins, Green 

 Alg. N. A., 1909, p. 387 (not of Agardh). Codium diniorphiim Hurd, 

 Pug. Sound Mar. Stat. Publ., vol. 1, 1916, p. 211-217, pi. 38, f. 1-13 ; 

 Collins, Green Alg. N. A., Supl. 2, June, 1918, p. 88 (not of Svedelius). 



Codium Setchellii represents the adhaerens group of J. Agardh 

 (1886, p. 37) on our coast. For many years all the collections of this 

 group from the Pacific Coast of North America passed under the name 

 of C. adhaerens (Cabr.) Ag. Many different species, however, have 

 been and still are referred to C. adhaerens, and much careful study 

 and comparison will be necessary before they can be satisfactorily 

 separated. 



Miss Hurd {loc. cit.) was the first to throw doubt on the relation- 

 ship of our plant with the C. adhaerens of the European coast. She, 

 however, concluded from her studies that our plants, particularly from 

 the region of the San Juan Group of Islands, Washington, are identical 

 with C. d/imorphum Svedelius (plate 9, figs. 7, 8) from West Pata- 

 gonia. A careful study and examination of authentic material show 

 sufficiently constant differences between that species and our plants 

 to seem to make it necessary to consider ours distinct from that species 

 and from the European C. adhaerens as well. It has consequently 

 been described as new by Gardner {loc. cit.), its type locality being 

 Monterey, California, since from that general locality only have fruit- 

 ing specimens been collected. It is highly desirable that material be 

 studied at different seasons throughout its range and fruiting material 

 found Math a view of determining whether we have one or more species 

 on our coast. 



2. Codium Ritteri S. and G. 



Plate 16, fig. 5 



Thallus spongy, globose when young, becoming flattened, expanded 

 and variously lobed when older, 1.5-2.5 cm. thick, attached by a broad 

 base ; the center and lower portion consisting of tortuous, loosely inter- 

 woven, rhizoidal filaments, 50-65/x diam. ; utricles clavate, usually 

 branching, rarely swollen in the middle and fusiform, mostly truncate, 



