1925] SetcheJl-Gardncr: Melanoph\iveae 449 



filaments such as he represents in figure Ih (Joe. cii.). These latter 

 conditions we may have overlooked in our study, as the plants are 

 exceedingly difficult to trace. The hair character is one that varies 

 considerably in any species. 



11. Streblonema evagatum S. and G. 



Fronds forming circular masses 1-2 cm. diam. ; creeping filaments 

 irregular, much branched, penetrating among the sporangia of the 

 host at their bases; erect filaments fasciculately branched, usually 

 within the host, tapering very slightly at the apex and at the base, 

 190-230/A high ; cells of the creeping portion 3.5-4ju, diam. ; cells of 

 the erect filaments 4/a diam. at the base, 2-3.5 times as long, 6.5-7. 5/i, 

 diam. in the widest part, 1-2 times as long, cylindrical, slightly con- 

 stricted at the cross-walls; chromatophores band-shaped, 1-2 in a 

 cell ; zoosporangia unknown ; gametangia numerous, cylindrical, 

 lateral, sessile or on short pedicels, 65-80/i, long, 5.5-6.5/x diam. ; loculi 

 uniseriate. 



Growing' in the blades of Laminaria Anders&nii, upper sublittoral 

 belt. Cypress Point, Monterey County, California. 



Setchell and Gardner, Phyc. Cont. V, 1922, p. 390, pi. 42, figs. 1-5. 



This species has a habit of growth very similar to that of Streh- 

 lonema pacificum, but the plants cover much more extensive areas 

 which are quite certainly not infested by a single plant as may be the 

 case in that species. Their presence seems to affect the host materially, 

 to a large extent destroying its sporangia and causing discoloration. 

 It is possibly partially parasitic. 



12. Streblonema rugosum S. and G. 



Plate 52, figs. 5-7 



Fronds microscopic, producing decidedly rugose areas of consid- 

 erable extent on the surface of the host ; creeping portion penetrating 

 among the cells near the surface of the host, giving rise above to 

 fasciculately branched, erect, fructiferous filaments and hair fila- 

 ments ; cells of creeping and erect filaments very irregular in shape 

 and size ; chromatophores band-shaped ; zoosporangia unknown ; game- 

 tangia blunt, fusiform, terminal on most of the erect filaments, 18-24ju, 

 long, 5-6. 5/A broad ; loculi uniseriate, 4-6 in a series. 



Growing on the blade of Alaria teniiifolm. Friday Harbor, 

 Washington. 



Setchell and Gardner, Phyc. Cont. V, 1922, p. 390, pi. 43, figs. 5-7. 



