490 Howe: Phycological studies 



species made in February, 1904, by Dr. D. T. MacDougal, in 

 San Felipe Bay, 500 miles or more north of La Paz and near the 

 head of the Gulf of California, is reported upon; of these we have 

 ventured to propose one species as new. In the list are included 

 also three other species from La Paz, which came to the herbarium 

 of the New York Botanical Garden in 1904 through the purchase 

 of the herbarium of Dr. C. L. Anderson, of Santa Cruz, California. 



CHLOROPHYCEAE 



Ulva fasciata Delile, Fl. Egypte 153. pi. 58. f. 5 



La Paz, Vives 12 and 24. 



The specimens appear to approach Setchell's forma expansa. 

 The thallus is only 35~55m thick and the cells in the older parts 

 are often subquadrate in cross section, but in these respects the 

 plants do not differ much from the New York Botanical Garden 

 copy of Phyc. Bor.-Am. LXXVII, distributed as Ulva fasciata 

 forma expansa Setchell. 



Ulva Lactuca rigida (Ag.) Le Jolis, Liste Alg. Mar. Cher- 

 bourg 38. 1863 



Ulva rigida Ag. Sp. Alg. 410. 1822. 



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

 Thallus 36-42^ thick, brownish, becoming almost livid. 



(?) Enteromorpha intestinalis (L.) Grev. Alg. Brit, lxvi, 179. 



1830 



La Paz, Vives 16. 



Inconspicuously proliferous near base, the proliferations often 

 short and spinescent; membrane 40-54^ thick; cells mostly 13- 

 25/u in diameter, rather thin-walled, in cross section of thallus 

 about 40ju long, exclusive of outer walls; attached to the stalks 

 of a Sertularian (?) animal. 



Enteromorpha Linza (L.) J. Ag. Till Alg. Syst. 3: 134. 1882 



Ulva Linza L. Sp. PI. 1163. 1753. 



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



The plants are small and unusually narrow (4-10 cm. long, 

 1-6 mm. wide) and their margins are plane or nearly so. They 



