582 University of California Publications in Botany [Vol. 8 



3. Coilodesme corrugata S. and G. 



Plate 46, figs. 3, 4 



Fronds very fragile and flaccid, very closely wrinkled all over the 

 surface, 3-7 cm. long, 8-14 mm. broad, 40-55//, thick, attached to the 

 host by (penetrating?) rhizoidal filaments, rounded above, attenuated 

 below into a short delicate stipe ; color light brown ; internal tissue 

 composed of 2 layers of large, irregular, colorless cells and the cortical 

 tissue composed of 2-3 layers of small, angular cells; zoosporangia 

 irregular in form, usually broader than long. 



Epiphytic upon Cystoseira neglecta S. and G. In the upper sub- 

 littoral belt. Santa Catalina Island, southern California. 



Setchell and Gardner, Phyc. Cont., VII, 1924, p. 8. 



This is the smallest and most delicate species of the genus, and 

 seems related to C. amplissima in general outline and structure. These 

 characters, together with the delicate wrinkling and its occurrence on 

 a distinct and not common host, lead us to keep it distinct. Appar- 

 ently it is quite limited in its distribution. 



4. Coilodesme polygnampta S. and G. 



Plate 82 



Fronds usually densely fasciculate, 1-4 dm. high, 1-5 cm. broad, 

 moderately firm, complanate, at least at maturity, with definitely 

 undulate and crisped margins, attached to rocks by a small, paren- 

 chymatous, disk-shaped holdfast, rounded and blunt above, tapering 

 more or less abruptly at the base into a definite, small, solid, cylin- 

 drical stipe, dark reddish brown in color ; histologically the interior 

 tissue is composed of about 2-3 layers of colorless cells, the cortical 

 tissue is composed of about 3 layers of small, assimilating cells in 

 anticlinal rows. 



Growing on rocks in the lower littoral and upper sublittoral belts. 

 Bering Sea. 



Setchell and Gardner, Phyc. Cont., VII, 1924, p. 9. Coilodesme 

 hiilligera Setchell and Gardner, Alg. N.W. Amer., 1903, p. 240 (in 

 part) ; Collins, Holden and Setchell, Phyc. Bor-Amer. (Exsicc), 

 no. 923&. 



The plants referred from our Pacific Coast to Coilodesme hiilligera 

 Stroemf., do not all seem, on further study and careful comparison, 

 to be the same as those of Iceland and Greenland. Our specimens 



