268 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



ultimate branchlets formed on the lower side of the lowest cell of the 

 penultimate branch, the last series slender, very slightly curved, 12-20 /* 

 diam., tapering, the cells 1.2-1.5 diameters long, the tips obtuse; poly- 

 sporangia sessile on the ultimate branchlets near the base, usually one or 

 two, occasionally three on either side but chiefly on the upper. 



This plant at first glance suggests a luxuriantly developed P. pyg- 

 maeum Gardner (1927, p. 379), but that plant has, among other dif- 

 ferences, larger, stipitate sporangia. 



Ecuador: Archipielago de Colon, dredged in some quantity off 

 Academy Bay, I. Santa Cruz, no. 34-312 (tetrasporic, TYPE), 20 Jan. 

 1934. 



GRIFFITHSIAC. Agardh, 1817 



Plants erect, bushy, of notably large-celled falsely dichotomous or 

 laterally dividing branches; cells multinucleate, with very many small 

 chromatophores and a large central vacuole; commonly bearing delicate 

 colorless repeatedly tri- to polychotomously branched hairs; tetrahedral 

 sporangia whorled at the fertile nodes, partly covered by involucral cells 

 in some species ; spermatangia very small in caplike sori on the outer ends 

 of the fertile cells; cystocarps laterally displaced, eventually appearing 

 subtended by involucral cells on the sides of the fertile filaments. 



Griffithsia pacifica Kylin ( ?) 



Kylin 1925, p. 58; Smith 1944, p. 324, pi. 83, fig. 2. 



Plants stout, to about 1 dm tall, the branches erect, somewhat taper- 

 ing, the cells clavate cylindrical in the middle portions of the plant, about 

 1 mm diam., 3-5 mm long. Sterile, and therefore determination somewhat 

 questionable. 



Mexico: Is. Revilla Gigedo, rare as dredged near Sulphur Bay from 

 46 meters at sta. 135, I. Clarion, no. 34-44, 5 Jan. 1934. Ecuador: 

 Archipielago de Colon, abundantly dredged near Post Office Bay at 55 

 meters, I. Santa Maria, no. 34-376, 29 Jan. 1934. 



GER AMIUM Wiggers, 1817 



Plants erect and bushy, or matted, branching dichotomous or pinnate, 

 the segmented branches with a uniseriate axis of large cells corticated at 

 the nodes by smaller cells, from which zones cortication may spread to 

 more or less completely cover the internodes; sporangia tetrahedral, 

 sessile, borne at the nodes or immersed more or less completely in the 



