1925] SetcheU-Gardner: Melanophyceae 703 



Pelvetiopsis limitata (Setchell) Gardner 



Two fairly well defined forms of this species have been found along: 

 the California coast, but not growing together. 



Pelvetiopsis limitata f. typica Gardner 



Plate 46, fig. 6 



Fronds narrow, 8-10 cm. long, when young beginning to fruit 

 before branching and when only 2-3 cm. long; receptacles nearly 

 cylindrical, often long-attenuate ; conceptacles conspicuous. 



Growing along high-tide level or above, where the surf dashes 

 against rocks. Hanging from Vancouver Island to central California. 



Gardner, Nuclear Extrusion, 1910, p. 127, pi. 16, figs. 1-7, New 

 Fucaceae, 1913, p. 321, pis. 38, 39, figs. 8-30. Pelvetia fastigiata t 

 limitata Setchell, in Collins, Holden and Setchell, Phyc. Bor.-Amer. 

 (Exsicc), no. 1238. Pelvetia fastigiata Tilden, Amer. Alg. (Exsicc), 

 nos. 233 and 517. 



Pelvetiopsis limitata f. lata Gardner 



Fronds comparatively robust, 15-18 cm. long, frequently much 

 contorted, receptacles flat, wide and mostly blunt, in age often inflated. 



Growing usually near high-tide limit. Observed along the coast of 

 central California, from Tomales Point to Half Moon Bay. 



Gardner, Nuclear Extrusion, 1910, p. 127, New Fucaceae, 1913, 

 p. 321, pis. 40, 41, figs. 31-43; Collins, Holden and Setchell, Phyc. 

 Bor.-Amer. (Exsicc), no. CXIV. 



68. Hesperophycus S. and G. 



Fronds complanate, arising from a solid, disk-shaped holdfast, 

 dichotomous, with distinct percurrent midrib, a short compressed stipe 

 and linear segments, oogonia developing but one viable gamete, or 

 egg, seven nuclei falling to the bottom of the oosphere being cut off and 

 forming a non-viable part. 



Setchell and Gardner, in Gardner, Nuclear Extrusion, 1910, p. 127. 

 New Fucaceae, 1913, p. 317. 



