1925] SetchcU-Gavdncr: MelanopJiyceae 441 



5. Patches indefinite in outline and extent 6. S. penetrale (p. 446) 



6. Patches definitely erumpent 7 



6. Patches discolored, filaments only shghtly erumpent 



7. S. transfixum (p. 446) 



7. Gametangia pluriseriate 8. S. irregulare (p. 447) 



7. Gametangia uniseriate 8 



8. Parasitic on Zostera 4. S. vorax (p. 444) 



8. Parasitic on other algae 9 



9. Spots aecidioid 14. S. aecidioides f. pacificum (p. 450) 



9. Spots not aecidioid 10 



10. Gametangia cylindrical 15. S. myrionematoides (p. 452) 



10. Gametangia narrowly elliptical 10. S. pacificum (p. 448) 



11. Erect filaments not over 8m in diameter 12 



11. Erect filaments over lOyu in diameter 15 



12. Gametangia single 5. S. Porphyrae (p. 445) 



12. Gametangia corymbose 13 



13. Gametangia 25-40^ long 14 



13. Gametangia over 60^ long 9. S. minutissimum (p. 447) 



14. Erect filaments 4-5m in diameter 1. S. corymbiferum (p. 441) 



14. Erect filaments 5-8yu in diameter 16. S. invesdens (p. 452) 



15. Gametangia 50-100m long, 10-16m broad 2. S. anomalum (p 442) 



15. Gametangia 90-130^ long, 28-36m broad 3. S. Johnstonae (p. 444) 



1. Streblonema corymbiferum S. and G. 



Plate 52, fig. 8 



Fronds microscopic, composed of irregularly and alternately 

 branched filaments penetrating among the cells of the host ; fructi- 

 ferous ramuli decidedly aggregated, forming corymb-like clusters near 

 the surface of the host ; cells mostly cylindrical, in part irregular, 

 ■ir-Ofx diam., 1.5-4 times as long; chromatophore band-shaped, not 

 covering the cell ; zoosporangia unknown ; gametangia cylindrical to 

 slightly fusiform, blunt, terminal on short pedicels, borne in clusters, 

 or sessile on filaments creeping near the surface of the host, 25-35/x 

 long, 4.5-5.5/i, broad; loculi uniseriate, dividing walls frequently 

 oblique. 



Growing on Cwmagloia Andersonii (Farlow) S. and G., in com- 

 pany with Streblonema anomalum and *S^. Johnstonae. San Pedro, 

 California. 



Setchell and Gardner, Phyc. Cont. V, 1922, p. 391, pi. 43, fig. 8. 



While studying material of Cwmagloia Andersonii (Farlow) 

 S. and G. collected by Mrs. H. D. Johnston at San Pedro, California, 

 in 1899 and deposited in the Herbarium of the University of Cali- 

 fornia under no. 94663, some specimens of Ectocarpaceae were inci- 

 dentally observed. When we came to study our material of this 



