280 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



From his study, Yendo concluded that the figures of Kiitzing (loc. 

 cit.) represent the typical form of the species and that which is common 

 on the coast of Japan. Returning to the specimens from the Gulf, we see 

 that they have conspicuous proliferations arising on the surface of the 

 flattened blades as well as along the margins. This occurs in all collections 

 and must be considered typical of the Gulf material. On the other hand, 

 the specimen of Okamura in the Exsiccatae set of W. A. Setchell is merely 

 marginally pinnate; the figure of Kiitzing of one of Liebmann's original 

 specimens from Mexico shows only marginal proliferations, and the de- 

 scriptions and discussion given by Yendo include no mention of prolifera- 

 tions other than marginal ones. Some Japanese specimens in the Univer- 

 sity of California Herbarium show proliferations from the surfaces, but 

 rarely to so great a degree as in the Gulf material. It is, therefore, to be 

 suspected that we may be dealing with a different species in the Gulf from 

 that known on the southern coasts of Mexico, in Japan, and perhaps else- 

 where. 



J. 25, lower littoral, San Francisquito Bay, June; J. 53a, San Esteban 

 Island, April; J. 87, Isla Partida, July; D. 443, San Esteban Island, Feb. 



Grateloupia ? Hancockii sp. nov. 

 Plate 69, Fig. 2 



Frondes caespites rotundas formantes, 2-3 cm. altas, e disco emergentes, erectae 

 complanatae, angustae, plerumque in medio .5-.7 mm. latae, 300-400 fx crassae, 

 prorsus copiose margine ramosae, apicibus acutis, saepe attenuatis. 



Plants forming greenish-black, rounded, caespitose clumps 2-3 cm. 

 high, from a discoid holdfast attached to rocks and old corallines, the 

 holdfast giving rise to several to many erect fronds ; erect parts flattened, 

 narrow, mostly about .5-. 7 mm. wide in middle portions, 300-400 ju, thick, 

 abundantly branched throughout, the branches marginal, apices commonly 

 acute, often attenuated ; cross section showing a loose medulla of 

 branched, frequently septate filaments, interlacing obliquely but -f- — 

 longitudinal, these more closely packed in outer medulla, merging into the 

 subcortex composed of about 2 layers of cells 12-15 fx. diam., these adjoin- 

 ing the outer composed of anticlinal rows of 4-5 minute elliptical cells 5 [x 

 or less long; fertile material unknown. 



Type : D. 650, middle littoral rocks on point 3 mi. N. of Kino, July 

 15, 1940. Herb. AHF no. 30. 



Only a single collection of this species is as yet known, but from the 

 consistency, branching habit, and cross-sectional appearance, it seems most 

 likely to be a small member of the genus Grateloupia. In its several char- 

 acters of size and habit it is distinct from any other known species. 



