1920] Setchell-Gardncr : Chlorophyccae 151 



."i. Codiohim A. Bra mi 



Frond unieelhilar, ovoid to elavate or subcylindrical, the cell wall 

 prolonji:ed below into a lonjici* or sliorlci- slipe, attached ])y a simple 

 or forked expansion ; chromatophore covering the cell wall or more 

 or less lirokcii, with several pyrenoids ; asexnal reproduction hy 4- 

 ciliated zoospores, many in a cell. 



A. Brann, Alfianiiii Tnic, 1855, p. 19. 



This genus was first mentioned in 1852 hy Braun before the '29th 

 Congress of naturalists and pliysiciaiis at Wiesbaden (cf. Flora, 1852, 

 p. 755) and was excellently described and illustrated in full in 

 1855 in his "Algarum Unicellularum Genera nova et minus cognita" 

 (p. 19). The type species is Codiohim (/re(/(iriiiiii A. Braun, and the 

 t3'pe locality is Helgoland. 



The species of Codiolum are all very similar and consist of a color- 

 less stipe of longer or shorter dimensions bearing above a sw^ollen cell 

 Avhieh is elongated ovoid in shape and which is termed the "clava." 

 The dimensions of both stipe and clava differ somewhat even in tlie 

 same species, but in the endophytic species the stipe may be al>i)re- 

 viat( d or even, most commonly, wanting. 



Key to the Species 



1. Cells with ii long stipe not endophytic 1. C. gregarium (p. 151) 



1. Cells with stipe short or wanting, endophytic 2. C. Petrocelidis (p. 152) 



1. Codiolum gregarium A. Braun 

 Plate 15, fig. 2 



Clava narrowly elliptical in median section, definitely delimited 

 from the long narrow stipe, up to 500/a long, and l()0;a wide; stipe 

 hyaline, unbranched, nearly cylindrical but slightly enlarging upward, 

 600-10()()/j. long, 20-30/Li wide, somewhat disk-shaped at the base. 



Reported from a single locality in our region, growing on an ifon 

 buoy near Friday Harbor, San Juan County, Washington. 



A. Braun, Alg. Unic, 1855, p. 20, pi. I, f. 1-17 ; Collins, Green Alg. 

 N. A., 1909, p. 152. 



There have been described several species of Codiolum beside the 

 endophytic species and these species have been dependent largely upon 

 differences in various dimensions, but particularly on length of stipe. 

 Borgesen, however, in his "Marine Algae of the Faeroes" (1902, 



