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



13. Ectocarpus paradoxus pacificus, var. nov. 



Plate X\'III, Figs. 4-7. 



Erect filaments arising from a compact mass of creeping ones, 25-40/^ 

 broad, divergently branched, branches long, bearing above several short, 

 pointed branchlets ; cells about as long as broad, near the extremities one-half 

 as long, slightly constricted; plurilocular sporangia cylindrical, ovate or lanceo- 

 late, obtuse or abruptly pointed at the apex, borne laterally on the main 

 stem and branches on a long or short stalk, 70-150// x 25-50/x ; unilocular 

 sporangia on short stalk or intercalary, globose, about 30// in diameter. 



Forming small tufts 2-5 mm. high on Fiicus. cvanesceiis, 

 rnost abundant on the fruiting tips; differs from the type in 

 its smaller size, in the branching which is never opposite, 

 and in the plurilocular sporangia which are longer and more 

 pointed. 



14. Ectocarpus mucronatus, sp. nov. 



Plate XIX. 



Plant light olive-green, attached at base by a few long, colorless, creeping 

 filaments. Erect filaments 1-5-6 cm. high, loosely intertwined, terminated 

 above by a short, colorless hair, unbranched at base ; main filament 30-40// 

 broad ; cells one-third to as long as the diameter, below three times as long, 

 not at all constricted, branches spreading, numerous, scattered, mostly short 

 and pointed ; chromatophores disk-form, numerous in each cell ; plurilocular 

 sporangia sessile, numerous, 50-155// x 20-30//, ovate or lanceolate, short- 

 acuminate, borne on both the main filament and the branches. 



Attached to Zonaria toiirnefortii which was washed 

 ashore. San Pedro, California. 



Also on Petrospongium berkleyi collected on rocks near 

 San Pedro by A. J. McClatchie (1273). 



15. Ectocarpus corticulatus, sp. nov. 



Plate XX. 



Plant erect, 3 mm. to 3 cm. and more high, arising from a small, compact 

 network of creeping filaments. Main filament 90-120// broad, irregularly 

 much branched below, above somewhat dichotomously branched ; branches 

 50-70// wide, spreading, irregular, some long and bearing many short 

 branches, others short and few celled, all ending abruptly ; the main stem 

 and the branches densely corticated ; cells one-half to as long as broad, but 

 slightly constricted ; chromatophores few, large, band-form, each containing 

 several pyrenoids ; plurilocular sporangia very variable in size and shape, 

 lanceolate or narrowly ovate, short stalked or sessile, mostly 30-40// x 12-18// 



