34 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



few loose, little-appressed, descending rhizoids near the base, 80-110 fx in 

 diam. below, the cells 5-8 diameters long, shorter above to as little as 

 1 diameter long; main branching multifarious; secondary determinate 

 branches regularly alternate and essentially distichous, divaricate, little 

 or not at all incurved even at the tips, becoming distinctly recurved, 

 reaching about 1 mm. in length, the cells about 1 diameter long, the 

 tips blunt; tetrasporangia seriate and adaxial on the determinate 

 lateral branches, ovoid, sessile, about 70 /x long, 55 fi broad; sperma- 

 tangia forming a continuous row along adaxial surface of lateral 

 branchlets almost to the tips. 



Type: A collection by C. L. Anderson in Herb. New York 

 Botanical Garden. 



Type locality: Monterey Bay, California. 



Mexican distribution: Pacific Baja Calif. — D. 19224 (Norris), 

 Punta Banda (intertidal) ; D. 1140, D. 1198, Punta Baja (intertidal) ; 

 D. 1439, D. 1474, D. 2785, Punta Santa Rosalia (intertidal) ; D. 9814, 

 D. 9824, D. 9840, D. 9854, Isla Cedros (intertidal) ; D. 9106, D. 9118, 

 D. 9429, Islas San Benito (intertidal) ; D. 9201, Bahia Asuncion (inter- 

 tidal) ; D. 9282, 9318, Isla Magdalena (intertidal). 



Taylor (1945) had indicated the probable occurrence of a small 

 form of this species in the Galapagos Archipelago, but this must be 

 verified by further collections. 



Callithamnion soccoriense Tayl. 

 PL 11, fig. 2-3 

 Taylor 1945, p. 258, pi. 86, fig. 2. 



Thalli 2-4 (7) cm. tall, commonly epiphytic, consisting of soft, 

 loose tufts of alternately branched filaments, 110-150 jx in diameter 

 below, tapering to 70-80 jx above; principal axes uncorticated, but 

 producing sparse, multicellular, little-branched rhizoids from the lower 

 end of cells near the base of the plant; cells of principal axes 3-5 (8) 

 diameters long, those of the ultimate branches (40) 50-60 (70) /x in 

 diam., mostly 1-2 (2.5) diameters long; branching essentially in 3 

 orders, tending to be distichous, the ultimate branches of 8-15 cells, 

 1 mm. long or more, the last 2 or 3 cells much smaller than the others, 

 tapered to a sharp point (or sometimes blunt) ; tetrasporangia sessile, 

 solitary and adaxial near the base of branchlets, about 48 /a in diam., 

 55 jx long; cystocarps near the tips of minor branches, about 120 fx in 

 diam., commonly with a single lobe; spermatangia forming small (60-70 

 ix diam.) dense, hemispherical, serial, adaxial tufts from the distal end 

 of lower cells of ultimate branchlets. 



Type: Taylor 19, Jan. 2-4, 1934, in Allan Hancock Foundation 

 Herbarium, (102). 



Type locality: Dredged in 14-18 fms., Braithwaite Bay, Socorro 

 Id., Revillagigedo Islands. 



