256 



Puget Sound Marine Sta. Pub. 



Vol. 1, No. 25 



4. EcTocARPus GRANULOSUS (Engl. Bot.) Ag. Sp. p. 45; (Ectocarpus se- 

 cundatus Suhr^ Flora 1840, p. 279. Fig. 5 



Plants composed of filaments 1 to 5 cm. long; main branches mostly 

 opposite, many of them corticated ; secondary branches opposite, short, 

 given off at wide angles, curved at tips ; cells 40 to 75 fx broad, width 

 half to once the length. Plurilocular sporangia abundant, sessile on the 

 secondary branches, broadly ovate, obliquely truncate at the base; uniloc- 

 ular sporangia wanting. 



On Desmarestia ligulata. 



Ectocarpus 

 cylindricus 



Ectocarpus 

 granulosus 



Phycocelis 

 baltica 



PLATE 48 



Figs. 4 and 5., Portions of filaments with plurilocular sporangia. 

 X about 300. 



Fig. 6. Several filaments, s, a sporangium. X about 250. 



3. PHYCOCELIS Stroemfelt 



L Phycocelis baltica (Reinke) Foslie, New or Crit. Norw. Alg., 1894, 

 p. 17, under Myrionema. Fig. 6 



Plants minute, epiphytic, forming small patches ; basal part forming 

 a small cellular disc composed of one or two layers of cells, some of the 

 cells often entering the tissue of the host ; erect filaments from several 

 cells to several mm. long, monosiphonous or rarely branched ; chromato- 

 phores irregularly band-like ; plurilocular sporangia sessile or stalked, 

 usually terminal but rarely lateral, mostly composed of a single vertical 

 row of cells. 



Common on the basal parts of Desmarestia ligulata f. herbacea and 

 Desmarestia aculeata. Perhaps more than one species will be found by a 

 more careful study of our specimens. 



