L925] Setrhcll Gardner: Melcmophycew 579 



exactly the nature of Ruprecht's Aspe.rococcus Cystoseircu and its 

 relation to the Japanese plant on the one hand and the Alaskan plant 

 on the other. Rupreeht states that the type of A. Cystosevrae is para- 

 sitic on Cystoseira Lepidmm hut not on ('. thyrsigera. 



Key to the Species 



1. Fronds complanate from the beginning, rigid, membrane up to .*^7o/u thick, 



epiphytic, stipe short 6. C. rigida (p. 584) 



1. Fronds inflated at first, collapsing, especially when ruptured, membrane less 



than 250^ thick 2 



2. Fronds ample, up to more than 1 m. long, and 1 dm. broad, epiphytic, 



stipe short 1. C. californica (p. 579) 



2. Fronds smaller in all proportions 3 



3. Fronds narrowly cylindrical, up to 8 mm. diam., and 8 dm. long, epiphytic, 



stipe short 5. C. Cystoseirae (p. 583) 



3. Fronds more or less irregular, subcylindrical 4 



4. Fronds finely corrugated, subsessile, epiphytic, stipe short 



3. C. corrugata (p. 582) 



4. Fronds undulate, decidedly stipitate 5 



5. Fronds saccate, slightly undulate, saxicolous, stipe slender, elongated 



2. C. bulligera (p. 581) 



5. Fronds flattened, decidedly bullose, with ruffled margins, saxicolous, stipe 



slender, elongated 4. C. polygnampta (p. 582) 



5. Fronds moderately bullose, epiphytic, stipe slender 7. C. sitchensis (p. 584) 



1. Coilodesme californica (Rupr.) Kjellm. 



Plate 46, figs. 1, 2, and plate 86 



Fronds flabby and fragile, smooth when young, more or less 

 wrinkled, or bullate, and ruffled along the margins at maturity, inflated 

 in the juvenile stage, soon collapsing because of ruptures, usually at 

 the apex, chiefly cylindrical, rounded above, tapering rather abruptly 

 at the base to a very short stipe 1-2 mm. long, variable in size from a 

 few decimeters to over a meter long, up to 12 cm. wide, 175 to 215/x 

 thick, composed of an inner tissue of 4-5 layers of large, colorless cells 

 intermixed with smaller cells, and a cortical tissue of cells in anti- 

 clinal rows, 2-4 cells in a row ; zoosporangia very irregular in form 

 and size, 40-45/* long; color light brown, changing to greenish on 

 exposure. 



Epiphytic on Cystoseira and Cystophyllum. Puget Sound region 

 to southern California (San Pedro). 



Kjellman, Undersok. Slagtet Adenoeystis, 1889a., pp. 4-8, figs. 1-8 

 (excl. specimen) ; Saunders, Phyc. Mem., 1898, p. 160, pi. 29, figs. 1-3, 

 Alg. Harriman Exp. 1901, p. 422; Setchell and Gardner, Alg. N.W. 

 Amer., 1903, p. 241; Collins, Mar. Alg. Vancouver Isl., 1913. p. 106; 



