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



44. Colpomenia sinuosa {Roth) Derb. & Sol. 



Plate XXXII, Figs. 7 and 8. 



Colpomenia sinuosa (Roth) Derb. d-^ Sol., 1. c. 

 Ulva sinuosa Roth, Cat. Bot., Ill, 327, Tab. 12, 1S06. 

 Asperococcus sinuosus Bory, of Anderson's list, etc. 



Plant body sessile, thin, membranaceous, 4 cm. to a dcm. high, sunken and 

 occasionally irregularly torn in the older forms, tissue .255 mm. in thickness, 

 the outer row of cells consisting of one or two rows of cuboidal, colored cells, 

 inner layer of two rows of large roundish cells ; plurilocular sporangia 20 x 

 7//, often containing the zoospores cells in two rows ; paraphyses a little 

 shorter and broader, 17 x io,a. 



The plant is usually found attached to other seaweeds 

 and seems to prefer quiet coves. Carmelo Bay, Monterey 

 Bay, and San Pedro, California. 



45. Colpomenia sinuosa expansa, form. nov. 

 Plate XXXII, Figs. 4-6. 



Plants aggregated, forming an indefinite expanded mass on rocks ; plant 

 tissue .425 mm. in thickness, the inner layer of tissue being composed of 5-7 

 rows of cells. 



Santa Catalina Island near Avalon Bay, California. 

 46. Colpomenia tuberculata, sp. nov. 



Plate XXXII, Figs. 1-3. 



Plant coriaceous, olive-brown, sessile, hollow, hemispherical, 5 cm. to a dcm. 

 or more in diameter; surface deeply convoluted, wrinkled, and folded, the 

 whole surface covered in the mature plant with blunt tvibercles i mm. -10 mm. 

 high, 1-5 mm. broad. Plurilocular sporangia 22-25// x 3-4/^, composed of 

 6-8 zoosporal cells in a single row ; paraphyses 22 x 5,a, remaining after the 

 zoospores have escaped. 



Near San Pedro, California. 



The plant forms large rounded brain-like masses attached 

 to rocks by the w^hole under surface ; the outer layer of 

 tissue .65-. 80 mm. in thickness, composed of 3-5 layers of 

 cuboidal cells, the inner 5-8 rows of large irregular cells. 

 The plant tissue is of firmer texture and much thicker than 

 in C. sinuosa. The structure of the tissue is very similar 

 to that of Hydroclathrtis cancellatiis. 



