250 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



In younger stages G. prolongata lacks the simple blades such as are 

 found in G. schizophylla. Unlike G. howei, it lacks the short, spinose 

 papillations of the blade. 



All but a few of the specimens at hand are tetrasporangial. 



Japanese specimens from Bosyu province appear to be indistinguish- 

 able from some of the Gulf of California examples. 



Grateloupia schizophylla Kvitzing 

 PI. 1, figs. 3-6 ; pi. 8, fig. 50 



Kiitzing 1867, Tab. Phyc. 17, p. 11, pi. 36; Howe 1914, p. 168, pi. 

 61-62; Taylor 1947, p. 73. Grateloupia calif ornica (invalid for want of 

 Latin diagnosis) Kylin 1941, p. 9, fig. 2B, pi. 1; Smith 1944, p. 239, 

 pi. 55, figs. 1-2; Dawson 1945c, p. 60, 66; Doty 1947, p. 170; Dawson 

 1949, p. 222, 225; Dawson 1951, p. 53; Dawson 1952, p. 431. 



Thalli membranous, ligulate, simple or divided, 15-100 cm. long, 

 1.5-5 (6) cm. broad, subentire to variously lacerate or proliferous, 

 usually solitary, or rarely more than two blades from a small attachment 

 disc; stipe short, cylindrical, simple or forked, usually narrowly cuneate 

 to the blade; blades linear-lancolate to ligulate, commonly once incised 

 longitudinally or divided above, compound and much dissected and pro- 

 liferous, or sometimes simple, the segments usually attenuated apically, 

 the margins entire or provided with spine-like lacerations, or the mar- 

 gins and blade surfaces with sparse or abundant blade-like proliferations ; 

 transection 160 to 400 /x thick, the anticlinal cortical filaments of 4-7 

 cells, becoming somewhat nemathecioid in mature tetrasporangial parts ; 

 tetrasporangia not in sori, scattered through the cortex just below the 

 surface, elongate-ellipsoidal, or sometimes ovoid, 25-35 /a long; cysto- 

 carps embedded on either side of thallus, scattered, but tending to be 

 aggregated in small groups, causing little elevation of the surface, the 

 pedicellate carpospore-masses commonly about 150 /a in diameter; anther- 

 idia superficial, ± continuous over the blade surface, causing slight ne- 

 mathecial modification of the cortex. 



Type: Holotype not specifically designated, but the original ma- 

 terial is on a sheet marked "Herb. Lugd. Bat. no. 941, 78-4" in the 

 Rijksherbarium, Leiden, Netherlands. 



Type locality: Chile. 



Mexican distribution: Pacific Baja Calif. — D. 151, Jan., D. 

 5222, D. 5143, Sept., Cabo Colnett; D. 1220, Socorro, Apr.; D. 1145, 

 Apr., D. 8837, Jan., Punta Baja; D. 1529, near Punta Maria, Apr.; 

 D. 9795, Bahia del Sur, Isla Cedros, Apr. (juvenile plants) ; D. 9260, 

 Isla Magdalena, May. 



