130 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



Type locality: Australasia. 



Mexican distribution: Pacific Baja Calif. — D. 5190, just north 

 of Bahia de Todos Santos, Sept.; Hubbs, Feb. 6, 1951, south side of 

 Bahia de Todos Santos; D. 1385 (Apr.), D. 2851 (Oct.), Millers 

 Landing; D. 10402, Punta San Eugenio, Nov.; D. 6582, Bahia Tor- 

 tuga. Mar.; Taylor 34-645a, Mar.; D. 9849, Apr., Isia Cedros; D. 

 9114, Islas San Benito, Apr.; D. 9942, D. 10320, 10 miles west of 

 Punta Malarrimo, Apr., Nov. 



This species was first reported on the Pacific Coast from La Jolla, 

 California (Ph^^c. Bor. Amer. no. 399), and is a common intertidal and 

 upper-sublittoral plant in southern California. Specimens are at hand 

 from as far north as Santa Cruz Island. In Baja California it seems 

 to avoid areas of intense upwelling and to be confined to the "warm 

 spots" between. 



The Mexican plants are in good agreement with fragments of La- 

 mouroux' type kindly sent by the conservateur of the herbarium, Uni- 

 versite de Caen. They agree also with specimens from South Africa 

 identified by Manza as Corallina gracilis. 



CoralHna gracilis var. verticillata van nov. 

 Plate 25, fig. 1 



Corallina subulata Solander, as interpreted by Setchell & Gardner, 

 1930, p. 179. 



Ad formam typicam speciei, at caulibus principalibus plerumque 

 crassioribus, ad 600 ju. diametro, ramificatione laterali plus minusve 

 prominenter verticillata; ramulis lateralibus caulem principalem spissius 

 tegentibus, tenuibus, attenuatis ad 70 jx diametro, saepissime bis usque 

 etiam ter dichotome ramificatis. 



Like the species in size, habit, color, structure and primary branch- 

 ing, but the main axes usually somewhat coarser, to 600 /x diam., and the 

 lateral branching more or less prominently, though irregularly, verticil- 

 late; lateral branchlets mostly 4-5 cm. long, rather densely clothing the 

 main axes, very slender, attenuated, to about 70 ju. diam., but seldom ex- 

 ceeding 200 jx diam. at the point of origin from the main axis, 2-3 (5) 

 times dichotomously, or partially irregularly pinnate-oppositely or alter- 

 nately branched ; conceptacles long-antenniferous. 



Type: Holotype is Dawson 8173, Dec. 17, 1949, on sheet 54923 

 in HAHF. 



Type locality: On intertidal rocks, Isla Guadalupe, Baja Cali- 

 fornia, Mexico. 



