60S University of California Puhlications in Botany [Vol. 8 



43, Cymathaere J. Ag. 



Holdfast discoid or with inconspicuous, rudimentary, simple liap- 

 teres ; stipe short, flattened, persistent ; blade long, narrow, wider at the 

 base and tapering upward, longitudinally grooved, or loosely folded, 

 folds deep at the base becoming nearly plane above ; mucilage ducts 

 abundant and large in both stipe and blade ; sori broad, on both sur- 

 faces, at the base of the blade, paraphyses unicellular with well 

 developed hyaline appendage (not as in Griggs, Ohio Naturalist, vol. 1, 

 1907, p. 92, as to absence of either mucilage ducts or hyaline tips to 

 the paraphyses). 



J. G. Agardh, De Lamin., 1867, p. 29. 



The genus Cymathaere resembles Pleurophycus in having longi- 

 tudinal grooves or folds. It is also peculiar in having a discoid hold- 

 fast, although this is not a primitive structure as Griggs (1907) sup- 

 poses. Griggs is, also, in error in denying mucilage ducts and hyaline 

 tips to the paraphyses on C. tripUcata, the only known species. 



Cymathaere triplicata (Post, and Rupr.) J. Ag. 



Holdfast discoid, 6-15 mm. broad ; stipe short and stout, 5-25 cm. 

 long, cylindrical below, flattened above ; blade undivided, narrowly 

 linear, tapering upward, with acuminate apex and rounded or cuneate, 

 rarely cordate base, 1.5-4 m. long, 8-18 cm. wide, thick and coriaceous 

 at the base, thinner above, possessing three characteristic longitudinal 

 folds extending throughout the length of the blade ; sori broad, occupy- 

 ing the basal portion only ; paraphyses linear with hyaline appendages ; 

 color yellowish brown. 



Growing on rocks in the upper sublittoral belt. From Bering Sea 

 to Puget Sound. 



J. G, Agardh, De Lamin,, 1867, p. 30 ; Saunders, Alg, Harriman 

 Exp., 1901, p. 430; Setchell and Gardner, Alg. N.W. Amer., 1903, 

 p. 264; Griggs, Cymathere, 1907, pp. 89-96, pi. 7; Collins, Holden and 

 Setchell, Phyc. Bor.-Amer. (Exsicc), no. XXXIII a, 1) ; Tilden, Amer. 

 Alg. (Exsicc), no. 343; Laminaria tripUcata Postels and Ruprecht, 

 Illus. Alg., 1840, p. 10, pi. 10. 



The type and only species of Cymathaere resembles in appearance, 

 color, texture, etc., Costaria costaia more nearly than any other alga. 

 In pressed specimens, the longitudinal folds are often obscured or even 



