282 Puget Sound Marine Sta. Pub. Vol. 1, No. 25 



Reported from this region from only one place by Tilden (16). 

 Washed ashore. Near Tracyton, Kitsap County. 



Tilden, American Algae No. 335, under Dictyota dichotoma. 

 Collins, Holden and Setchell, Phycotheca Boreali-Americana, No. SS^'. 



35. CHORDARIA C. Agardh 



1. Chordaria abietina Ruprecht, in Farlow, List of marine algae of the 

 U. S. p. 357. 1875. Fig. 47 



Holdfast a horizontal lobed pad one to several cm. across ; erect 

 stalks single or more often several from the same holdfast; central stalk 

 or axis one to five dm. long, with numerous lateral branches, composed 

 of a rather solid mass of pseudoparenchymatous tissue with scattered 

 longitudinal filaments surrounded by a solid peripheral layer becoming 

 somewhat hollow with age ; growth by apical and subterminal cells ; spo- 

 rangia scattered uniformly on the peripheral layer of the branches and 

 covered by short club-shaped paraphyses. 

 On rocks in the lower littoral zone. 



36. CASTAGNEA Derbes & Solier 



1. Castagnea divaricata (Ag.) J. Agardh, Till Algern System. 4: 37. 



Fig. 48 



Plant body one to two dm. long, several mm. thick, branched, com- 

 posed of a soft loosely intertangled mass of filaments which is made up 

 of a central monosiphonous filament with many lateral branches forming 

 a peripheral layer ; growth of filaments intercalary ; central filaments 

 colorless, lateral ones with many chromatophores ; unilocular sporangia 

 oval lateral outgrowths from the upper cells of the peripheral filaments.. 



On mud flat, lower littoral zone. East Sound, Orcas Island. Gard- 

 ner (14). 



37. MESOGLOIA Agardh 



1. Mesogloia Andersonii Farlow, Bull. Torr. Bot. Club. 16:9-11. 1889. 



Fig. 49 



Plants solitary or gregarious; thallus cylindrical in form, one to three 

 em. long, several mm. in diameter, repeatedly and irregularly dichoto- 

 mously branched ; secondary branches occasionally subpinnate, tips 

 scarcely attenuated, clothed with projecting hairs when young; unilocular 

 sporangia pyriform, at the base of cortical filaments, scattered uniformly 

 over the surface of thallus. 



On rocks in the lower littoral or upper sublittoral zone. 



Tilden, American Algae, No. 349, under Chordaria fiagelliformis. 



Collins, Holden & Setchell, Phycotheca Boreali-Americana,' No. 925. 



