148 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



2. Phycocelis reptans {Crouan) Kjelhn. 

 Plate XII, Figs. 8-12. 



Phycocelis reptans (Crouan) Kjellm. Handbk. I, 1890, 81. 

 Ectocarpiis reptatts Crouan, FI. Finist., 161, 1867. 



Plant forming rounded patches 1-5 mm. in diameter, the disk-hke base of 

 one or two layers of cells 12-15/i broad. Erect filaments 2-4 mm. high, 

 unbranched, ending in an abrupt, hyaline hair; cells 8-1 2,a broad, as long to 

 twice as long as the diameter; chromatophores small, oval or band form; 

 plurilocular sporangia lanceolate or linear-oblong, sometimes curved, 25-75/7. 

 (commonly 40-55/1) x 12-30//, terminal on the erect filaments or rarely sessile 

 on the basal ones. 



On the leaves and air-bladders of Nereocystis lutkeanus. 

 Pacific Grove, California. 



3. Phycocelis fcecunda Sti-ccmf. 



Plate XII, Figs. 1-7. 



Phycocelis foeciinda STRa:MF., Not., 1888, 383. 



Spots orbicular, yi mm. or so broad. Creeping filaments united to form a 

 disk-like, unistratose, basal part; the erect filaments simple, of 2-6 cells which 

 become transformed into sessile or stipitate, uniseriate, cylindrical, plurilocular 

 sporangia, 27-40// x 6-10// ; a cluster of long hairs in the center of each spot. 



On Macrocystisfyrifera, Desmarestia ligidata, and Ptery- 

 gophora Californica. Pacific Grove, California. 



4. Streblonema Derb. & Sol. 



Streblonema Derb. d-'SoL., Cast. Cat. Pl. Mars. Suppl., 1851, 100. 



Plant body filamentous, consisting of two parts, the numerous branching 

 filaments ramifying through the tissue of a host plant; erect filaments 

 branched or sessile, usually ending in or bearing long hairs; unilocular spo- 

 rangia large, subglobose ; plurilocular sporangia simple or sometimes 

 branched, one to many seriate. 



5. Streblonema idi.'s>z\.ZM\dXvMis.(T]mr.)LeJol. 

 Plate XIII. 



Streblonema fasciculatiim Thur. in Le Jol. Alg. mar. Cherb., No. 100, Liste 



P- 73- 



Vegetative filaments irregularly much branched, branches alternate, irreg- 

 ular, 6-9/Jt broad, cells 1-3 times as long as broad, slightly constricted at the 

 joints; unilocular sporangia globose or ovoid, sessile or rarely stalked, 

 25-35/i X 21-30//, borne on the main filament or the branches; plurilocular 

 sporangia lanceolate or linear, obtuse at the apex, sessile or stalked, borne 

 on the branches near the surface of the infested plant, 40-100// x 8-12//, often 

 uniseriate. 



