502 Howe: Phycological studies 



complanata Collins (Phyc. Bor.-Am. 836) from Florida, but in that 

 the segments are only 2 mm. instead of 5-12 mm. broad and the 

 cystocarps are not confined to the margins. 



Scinaia furcellata undulata (Mont.) J. Ag. Sp. Gen. et Ord. 



Alg. 2: 422. 1852 

 Ginnania undulata Mont. Voy. Bonite, Bot. Crypt. 59. pi. 145. f. 3. 



1844. 



La Paz, Vives lid and 20b. 



This differs from Scinaia latijrons as noted above. 



The two specimens seen have a length of 10-14 cm. and their 

 segments are about 2 mm. wide.. The segments are probably 

 terete or nearly so in life, though they do not regain that form on 

 being soaked out. 



The specimens appear to agree essentially with those occurring 

 on the coast of California as far north, at least, as Santa Cruz. 

 The peculiarities of the Pacific Coast plant seem insufficient to 

 separate it specifically from Scinaia furcellata. 



(?) Gigartina Chamissoi (Mert.) Mont. Voy. 

 Bonite, Bot. Crypt. 71. 1844 



San Felipe Bay, D. T. MacDougal, Feb. 1904. 



The plants are rather small (3-8 cm. long), but are probably 

 nearer to G. Chamissoi than to any other described species. The 

 main segments are 2-10 mm. broad and are less regularly pinnate 

 and less elongate than in G. Chauvinii (Bory) Mont. The nar- 

 rower specimens resemble certain broader conditions of G. Teedii 

 (Roth) Lamour. The faces of the segments are smooth or some- 

 times lightly papillate and the only cystocarps seen are marginal. 

 The branching is much more pinnate than in any of the California 

 specimens that we have seen referred to G. papillata (Ag.) J. Ag. 



Anatheca dichotoma sp. nov. 



Thallus cuneate-attenuate at base, subcartilaginous or some- 

 what gelatinous, reaching a length of 25 cm., mostly 7-1 1 times 

 dichotomous and with occasional marginal proliferations, seg- 

 ments 6-12 mm. in greatest width, tapering to I or 0.5 mm. in the 

 ultimate divisions, 0.66-1.3 mm. thick, axils rounded, branches 

 erecto-patent, apices acuminate, almost terete or conic-terete; the 



