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



when present forming indefinite elongated inflations ; receptacles flat, long 

 and narrow, often forked. 



In the upper littoral zone. This species is represented by several 

 forms varying in width from linear forms to those about as wide as the 

 narrow forms of F. evanescens. 



28. PELVETIA Decaisne & Thuret 



1. Pelvetia fastigiata Decne. ; (Fucoidium fastigiatum J. Ag. Spec. 1: 

 p. 203.) Fig. 39 



Plants about ten to thirty cm. long; holdfast disc-shaped, about one 

 cm. across; stipe branched dichotomously from just above the base, main 

 part short, elliptical in cross section; blades many, on the ends of the 

 branches of the stipe, without midrib ; tips of blades forming two swollen 

 mucilaginous receptacles on which are found the small wart-like con- 

 ceptacles ; oogonium usually containing two equal eggs. 



Miss Tilden's report, and the similarity of the genus to Pelvetiopsis in 

 general appearance and habitat, are the reasons for the inclusion of the 

 species. 



In the littoral zone on rocks that are exposed to the spray. Found 

 on the west coast of Vancouver Island by Professor Tilden (16) No. 233. 



29. PELVETIOPSIS Gardner 



1. Pelvetiopsis limitata (Setchell) Gardner, Univ. Calif. Publ. 4: p. 



127; (Pelvetia fastigiata f. limitata Setchell, in Collins, Holden & 



Setchell, Phyc. Bor. Am.) Fig. 40 



Plant about ten cm. long; holdfast an irregular disc; stipe branched 



dichotomously from just above the base forming a cluster of branches; 



blades many, on the ends of the branches of the stipe, without midrib; 



tips of the blades forming two swollen or somewhat flattered mucilaginous 



receptacles ; oogonium containing two unequal eggs. 



Gardner (3, 4) separates Pelvetiopsis from the genus Pelvetia be- 

 cause in the former the two eggs in the oogonium are very unequal in 

 size while in the latter genus the two eggs are equal in size. The ex- 

 ternal appearance of the two genera is very similar. 



On rocks in the upper littoral zone. Gardner (3) gives the range 

 of this species from Vancouver Island to California; therefore it is in- 

 cluded in this region. 



30. CYSTOPHYLLUM J. Agardh 



1. Cystophyllum geminatum (Ag.) J. Ag. Sp. 1, p. 232. Fig. 41 



Holdfast a conical disc; plant body very much branched; lower 



branches short, flat and blade-like; upper branches long, terete, at times 



