484 University of California Puhlications in Botany [Vol.8 



widest part, terminal cells up to 9 times as long ; chromatophores band- 

 shaped ; zoosporangia broadly clavate, sessile or on short pedicels from 

 the creeping filaments, 60-90/x long, 22-28;a broad ; gametangia very 

 variable, rarely on short pedicels on the creeping filaments, at times 

 formed by transforming the upper portion of a long erect filament, 

 at other times by developing lateral secund projections from part or 

 all of the groups of loculi in the long, terminal gametangia, up to 

 400/x long, 11-15/x broad, blunt, clavate on the ends of the long 

 filaments. 



Growing on the pneumatocyst of Nereocysiis Luetkeana. West 

 coast of Washington (Moclips) to central California (Carmel Bay). 



Setchell and Gardner, Phyc. Cont. Ill, 1922, p. 361, pi. 37, figs. 1, 2. 



Like Compsonema ramulosuni, C. secundum has gametangia occupy- 

 ing a variety of positions and assuming a diversity of forms. The 

 form of gametangium which marks the species is the long terminal 

 form which develops numerous, short, blunt-conical, seriate, secund, 

 sessile gametangia, thus forming a complex composed of these game- 

 tangia and the metamorphosed cells in the upper part of the filament. 

 The end of the filament becomes reflexed, at times almost scorpioid. 

 The specimens from Moclips, Washington, were taken in May and 

 the gametangia were practically all empty, ^%e other parts of the 

 plants manifested signs of old age conditions. They seem to belong 

 to this species, but the filaments have a considerably greater diameter. 

 Typical zoosporangia with well-formed zoospores have been observed 

 in this collection. 



15. Compsonema secundum f. terminale S. and G. 



Plate 54, figs. 4, 5 



Fronds forming a continuous velvety stratum of indefinite expanse, 

 attached by very much distorted, branched, creeping filaments with 

 numerous, penetrating, subulate rhizoids from the under surface ; 

 erect filaments 700-800/x (up to 1 mm.) long, unbranched, or produc- 

 ing a few short secund fructiferous ramuli, straight, slightly tapering 

 toward the base, cylindrical above ; cells of the creeping and rhizoidal 

 portions irregular, variable in size ; cells of the erect filaments 

 ■cylindrical, not constricted, 6-8/i. cliam. at the base of the filaments, 

 2-3.5 times as long, 9-12/x diam. above, 0.5-2 times as long-; chromato- 

 phores irregular bands, few in a cell; zoosporangia ( ?) broadly clavate, 

 sessile or on short pedicels from the creeping filaments, 50-60^ long, 



