NO. 1 DAWSON : MARINE RED ALGAE OF PACIFIC MEXICO 125 



conceptacles compound by secondary conceptacles arising from them in 

 antenna-like manner; antheridial conceptacles more or less strictly ter- 

 minal on lateral pinnae, appearing more or less pedicellate, with a prom- 

 inent, narrow, elongate rostrum. 



Type: Holotype is F. M. Reed 321, Jan. 15, 1934, on sheet 

 545769 in the Herbarium of the University of California, Berkeley. 



Type locality: Reef opposite Doheny State Park, Orange Coun- 

 ty, Calif. 



Mexican distribution: Pacific Baja Calif. — Occurring at most 

 intertidal, rocky shore localities along the peninsular coast from the 

 international boundary to as far south as Isla Magdalena. The species 

 has not yet been obtained from the outlying islands of Guadalupe or 

 San Benito. With the exception of a single antheridial plant, all fertile 

 specimens examined were tetrasporangial. 



As Taylor (1945) has pointed out, "the supposedly distinctive fea- 

 ture of Joculator — that the conceptacles may be borne on the faces of 

 the segments — is not unique, for it is a not infrequent occurrence on the 

 classical Corallina officinalis L. of the New England coast." The same 

 is now found occasionally to be true of the forms of C. officinalis on the 

 Pacific Coast. Hence, it seems unwarranted to retain the present species 

 of Corallina under a separate generic name. 



Taylor's specimen from the Galapagos Archipelago (1945) has been 

 compared with Manza's type from southern California and found to. 

 agree satisfactorily.Together with other specimens reported here and 

 under var. digitatus below, it gives this species a wide distribution in 

 the eastern Pacific. The northernmost occurrence known to the writer 

 is at Santa Cruz Island, California. 



Corallina pinnatifolia var. digitata var. nov. 

 Plate 9, figs. 14-20; Plate 30, fig. 1 



Corallina pilulifera Postels & Ruprecht, as interpreted by Dawson, 

 1944, p. 275. 



Ad forman typicam speciei, at propensione digitata flabellataque 

 intergeniculorum, praecique pinnarum lateralium, valde patefacta, multa 

 intergenicula ultima intercalariaque formae summe irregularis dissecto- 

 flabellataeque efficiente. 



Like the type of the species in size, habit and branching, but the 

 digitate, flabellate tendency of the intergenicula, particularly of the 

 lateral pinnae, very prominently developed such that many of the ulti- 

 mate intergenicula, as well as intercalary ones, are of extremely irregular 



