130 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



PHORMIDIUM Kutzing ex Gomont, 1892 

 Phormidium Hancockii (Drouet) Drouet 



Drouet 1942, p. 139; 1936, p. 22, 23, fig. 15, as Schizothrix Han- 

 cockii and f. submersa. 



Mexico: I. Soccoro and I. Clarion. Ecuador: I. Wenman. 



Phormidium uncinatum Gomont 



Tilden 1910, p. 106, pi. 5, figs. 16, 17. 



Plant a thin green, black, or brownish gelatinous stratum, firm to very 

 soft and fragile, in shallow fresh water, the gelatinous material hyaline, 

 not coloring blue when treated with chlor-zinc-iodine, the trichomes 

 straight and parallel, stifif and fragile, not constricted at the crosswalls, 

 attenuate capitate and curved or spiraled at the tips, the cells quadrate or 

 shorter than broad, the crosswalls conspicuously granulated, the outer 

 membrane of the apical cell obtuse conical and thickened. 



Mexico: Baja California, from a ditch at the fishing settlement, 

 southeast side of I. Cerros, no. 39-1, 14 Mar. 1939. 



OSGILLATORIA Vaucher ex Gomont, 1893 

 Oscillatoria laetevirens Crouan ex Gomont 



Drouet 1936, p. 26, fig. 5. 

 Mexico: I.Clarion. 



SPIRULINA Turpin ex Gomont, 1893 

 Spirulina tenerrima Kutzing ex Gomont 



Drouet 1936, p. 26, fig. 14. 

 Ecuador: I. Isabela. 



