72 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



The original description of the tetrasporangia as "cruciate" would 

 seem, in the light of Taylor's studies, to have been a simple error in 

 preparing the description. The illustrations are not clear on this point. 



This is a species of the quiet waters of sheltered bays and lagoons, 

 and also of deep, quiet, well-illuminated waters, the Hollenberg material 

 having come from the former habitat, and the Taylor and Setchell and 

 Gardner collections from the latter. 



Griffithsia ovalis Harv. 



PI. 29, fig. 1 

 Harvey 1862, pi. 203; Abbott 1946, p. 440, pi. 1, fig. 1-4, pi. 2, fig. 1-2. 



Thallui tufted, to 2 cm. high, or creeping on other algae and decum- 

 bent but with erect filaments; cells oval to globular near the tips, 50-100 

 ix in diam., more or less moniliform in upper and midparts, larger, 

 ellipsoidal to subcylindrical and 500-700 /x in diam. in middle and lower 

 parts; branching essentially dichotomous, the tips sometimes slightly 

 convergent; tetrasporangia borne in a whorled cluster between the sub- 

 spherical cells near the tips, 40-50 [x in diam. at maturity, several on a 

 pedicel, an involucre of 12-16 short, slightly incurved cells surrounding 

 the whorl of sporangia; sexual plants not seen (modified from Abbott). 



Type: A Harvey collection, epiphytic on Zostera, in the Harvey 

 Herbarium, Trinity College, Dublin, Ireland. 



Type locality : King George's Sound, Western Australia 



Mexican distribution: Revillagigedo Archip. — D. 13564, 13567, 

 Binners Cove, Isla Socorro, intertidal. 



Griffithsia pacifica Kylin 



PL 29, fig. 2; PL 31, fig. 1-4 



Kylin 1925, p. 58, fig. 38-39; Dawson 1944, p. 314; Dawson 1949, p. 237; 

 Dawson 1951, p. 53; Taylor 1945, p. 268 (doubtful); Dawson, Neushul & 

 Wildman 1960, p. 64. 



Thalli tufted, 3-5 cm. high, regularly dichotomously branched, the 

 articulations cylindrical below, a little inflated at the upper ends above, 

 300-500 ll in diam. in middle and lower parts, reduced to 125-150 p. near 

 the tips, the lower cells 5-7 times as long as broad or more; tips without 

 branched filaments; tetrasporangia borne in a dense whorl between the 

 articulations of upper branches, on small branchlets with unicellular 

 involucral rays; spermatangia on richly branched small branchlets 

 between articulations of upper branches, without involucral rays. 



Type: A collection by H. Kylin in the Agardh Herbarium 

 Lund, Sweden. 



Type locality: Dredged from a depth of 5-10 fms., Turn Island, 

 San Juan Islands, Washington. 



Mexican distribution: Pacific Baja Calif. — D. 10346, 20604 

 (Neushul), Punta San Eugenio; D. 20589 (Neushul), Bahia Tortuga; 



