1919] Gardner: New Pacific Coast Marine Algae IV 489 



Codium Setchellii sp. nov. 



Plate 42, figs. 10, 11 



Thallo aiiiilanato. pnlviiinto. enmpacto, spongioso, 6-10 mm. nsqiie 

 ad 15 mm. crasso, ad saxa arete adliaefcnte, atroviridi; fills mediiUar- 

 ibus 12-30/x, diam.: utriciilis forma variabilibus, clavatis, cylindricis 

 aut nunc sub apieem constrietis, superne truneatis aut leviter rotun- 

 datis. 65-7 5/x latis, parietibus juvenis ubique tonuibus, aetate provccta 

 parietes apieales 6-16/.t erassos, lamelloso.s et leves ostendeutibus; 

 gametangiis cylindricis aut lente fusiformibus. 300-330/x longis, 45-55ju. 

 crassis. in utriculis singulis ; trichomatibus nullis. 



Thallus forming dense, compact, spongy, irregular cusbions. 6— 

 10 mm., up to 15 mm. tbick, adhering firmly to rocks; color dark glossy 

 green ; medullary filaments 12-30/a diam. ; utricles variable in shape, 

 clavate, cylindrical, or sometimes constricted below the apex, truncate 

 or slightly rounded above. 65-75/x. wide, walls thin throughout when 

 young, the outer ends 6-1 6/x thick, smooth, and lamellose when older; 

 gametangia cylindrical or slightly fusiform, 300-330/1, long, 45-55/i, 

 diam., growing singly on the utricles ; trichomes wanting. 



Growing on rocks in the lower littoral belt. Central California. 

 The type is no. 97655 in the Herbarium of the University of California, 

 collected at Pacific Grove, California, by ]\Irs. J. I\I. Weeks, in Febru- 

 ary, 1897. Cotypes were distributed in Collins, Holden & Setchell, 

 Phyc. Bor.-Amer. (Ex.sicc.), no. 523. 



Codium adhaerens Anderson, List of Calif. ^lar. Alg., 1891, p. 217; 

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

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

 Alg., 1899, p. 2, pi. 350, figs. 3 a-c, Alg. Harriman Exped., 1901, p. 

 416; Setchell & Gardner, Alg. N. W. Amer.. 1903, p. 231; Collins, 

 Green Alg. N. A., 1909, p. 387 (not of Agardh). Codium dimorpJnon 

 Hurd, Pug. Sound Mar. Sta. Publ., 1916. vol. 1, pp. 211-217. pi. 38, 

 figs. 1-13; Collins, Green Alg. N. A., Supp. 2, June, 1918 (not of 

 Svedelius). 



The first publication of the occurrence of this incrusting species 

 of Codium on the Pacific Coast of North America was that of C. L. 

 Anderson (1891, p. 218) under C. adhaerens Ag. referring to material 

 collected at Santa Cruz, California. The determination rests upon 

 the authority of W. G. Farlow. Under the same name it next appeared 

 ill an article by M. A. Howe (1893, p. 67), the material having been 

 studied at Monterey Bay, California. J. A. IMcClatchie (1897. p. 351 ) 

 reported it from San Pedro, California. Tt was distributed in Collins. 

 Tldldcii and Setchell, Phycotheca B or eali- Americana no. 523, in 1898, 

 from Pacific Grove, California. D. A. Saunders (1899, p. 2. pi. 350, 

 fig. 3) described it and figured the utricles, ba.sed upon material col- 

 lected at Point Pinos, IMonterey Bay. California, and at Point Carmel, 

 about ten miles south of Point Pinos. N. Svedelius (1900. p. 304) 



