66 University of Calif orniu Puhlicatians in Botany [Vol.8 



Kuetziii«r. Pliyc. Gen., 1843, p. 186 ; Gomont, Monogr. des OscilL, 

 1892, p. 215, pi. 6, figs. 17, 18 (1893, p. 235, Repr.) ; Collins, Holdeu 

 and Setchdl, Pliyc. Bor.-Amer. (Exsicc), no. 1158. 



This species seems to be represented with us, in brackish water, 

 by the typical form, although more frequently by the var. neapolitann 

 (Kuetz.) Gomont. Gomont {loc. cit.) describes 0. hrevis as having 

 "dissepimenta non granulata, " but his figures show them granulate. 



10a. Oscillatoria brevis var. neapolitana (Kuetz.) Gomont 



Trichomes larger than the type, 5-6.5/* diam. ; with uncinate or 

 twisted apices. 



Growing in salt marshes. San Francisco Bay, California. 



Gomont, Monogr. des Oscill., 1892, p. 229, pi. 7, figs. 14, 15 (1893, 

 p. 249, Repr.) ; Collins, Holden and Setchell, Phj^c. Bor.-Amer. 

 (Exsicc), no. 1304. OsciUaria neapolitana Kuetzing, Phyc. Gen., 

 1843, p. 185. 0. laetevirens Setchell and Gardner, Alg. N.W. Amer., 

 1903, p. 184 (not of Gomont). 



This variety is the more common form of 0. hrevis with us and is 

 found in characteristic form. 



11. Oscillatoria Okeni (Ag.) Gomont 



Trichomes forming a dark blue-green mass, straight, manifestly 

 constricted at the joints, 5.5-9/* diam. ; apices long and gradually 

 tapering, uncinate-arcuate with blunt apical cells ; length of cells 2.7- 

 4.5/t; end cell up to 8/x, neither capitate nor calyptrate; protoplasm 

 filled with fine granules. 



Growing in hot salt water. Oakland, California. 



Gomont, Monogr. des Oscill, 1892, p. 232,. pi. 7, fig. 18 (1893, 

 p. 252, Repr.) ; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 184; 

 Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 1605. 

 OsciUaria Okeni Agardli, Aufzahlung, in Flora, vol. 10, 1827, p. 633. 



The type specimen of Oscillatoria Okeni came from thermal waters 

 at Carlsbad. The specimen from the hot salt waters of the Key Route 

 pool seems typical. A reexamination of the specimens from Whidbey 

 Island referred to this species (Setchell and Gardner, 1903, p. 184), 

 shows them to be 0. chalyhea (Mert.) Gomont. 



