NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 131 



Additional material: Hubbs 46-153, Isia Guadalupe, Dec. ; 

 Hubbs 46-201, Isla Guadalupe, Aug. 



A near approach to the Guadalupe Island specimens is found in two 

 collections from Santa Catalina Island, California (D. 5706 and D. 

 5494) in which the attenuation of the lateral branchlets is the same, but 

 the verticillate branching not so prominent. 



The Brandegee specimen from Isla Guadalupe, referred with doubt 

 by Setchell and Gardner to CoraUina suhulata, seems to be an unusual 

 epiphytic example of this plant, in all respects like the ordinary saxi- 

 colous ones from the same locality. It does not compare at all favorably 

 with specimens of undoubted C. suhulata collected and determined by 

 B<^rgesen from near Kingston, Jamaica. 



Gorallina polysticha sp. nov. 

 Plate 9, fig. 6 ; Plate 29, fig. 2 



Thallis 3-5 cm. altis, dense rosulatis; caulibus erectis ad 1 mm. dia- 

 metro ad basim, supra gradatim reductis, plerumque sine ramis pri- 

 mariis ; intergeniculis subcylindricis usque etiam truncatoconicis, termino 

 maiore distali, ad genicula constricto; ramis secundariis determinatis 

 brevibus, subulatis, plerumque simplicibus, polystichis vel verticillatis ; 

 conceptaculis fere baud antenniferis. 



Thalli saxicolous, to 3.5 cm. high, densely tufted, consisting of many 

 erect, rather stiff axes from the basal crustose stratum; erect axes to 1 

 mm. in diameter at the base, gradually reduced above, unbranched, or 

 with a few primary branches above ; intergenicula subcylindrical below, 

 above truncate-conical or slightly compressed, the large end distal, most- 

 ly less than 1 mm. long, constricted at the genicula; secondary deter- 

 minate branches polystichous or verticillate (in some parts distichous), 

 1 to 10 from the thick, distal end of each intergeniculum, short, simple, 

 straight, subulate, 150-200 /a in diameter, of 1 to 3 segments, or once 

 (rarely twice) pinnate or forked, standing stifHy at an angle of about 

 45° ; conceptacles ovoid, about 500 /t in diameter, terminal on the short, 

 lateral branchlets and appearing pedicellate, or sub-sessile and replacing 

 such a branchlet, usually non-antenniferous. 



Type: Holotype is Dawson 8534, Dec. 20, 1949, on sheet 54947 

 in HAHF. 



Type locality: Intertidal rocky shore, 2.5 miles north of South 

 Bluff, Isla Guadalupe, Baja California, Mexico. 



