NO. 1 DAWSON : MARINE RED ALGAE OF PACIFIC MEXICO 37 



Gumagloia andersonii (Farlow) Setchell & Gardner 



Setchell & Gardner, apud Gardner, 1917, p. 399, pi. 31, pi. 32, figs. 

 1-4; Smith, 1944, p. 189, pi. 42, fig. 2; Dawson, 1945b, p. 60; Doty, 

 1947, p. 162. Nemalion andersonii Farlow, 1877, p. 240. 



Thalli saxicolous, 4-9 cm. high or more, soft and lubricous in texture 

 but tough, deep reddish-brown in color, consisting of one to several erect 

 fronds from a small, discoid attachment; erect axes usually unbranched, 

 terete or compressed, more or less contorted and irregularly constricted 

 or indented, 1.5-3.0 mm. in diameter, provided with numerous short, 

 mostly simple, slender, lateral branchlets 1.5-7.0 mm. long; thallus in 

 transection showing a medulla of colorless, intertwined longitudinal 

 filaments surrounded by a cortex of radiating, free, branched assimilatory 

 filaments ; reproduction sexual ; plants monoecious. 



Type: Holotype not designated, but probably represented by a 

 collection of C. L. Anderson in the Farlow Herbarium, Harvard Uni- 

 versity, Cambridge, Mass. 



Type locality: Santa Cruz, California. 



Mexican distribution: Pacific Baja Calif. — D. 32-45, Cabo 

 Colnett, Apr. (Herb. U. C). These are of the relatively small form of 

 the species, with unbranched lateral branchlets, such as also occurs in 

 southern California. 



Helminthocladia calif ornica (J. Ag.) Kylin 



Kylin, 1941, p. 6; Dawson, 1945c, p. 37. Helminthocladia australis 

 f. calif ornica J. Agardh, 1899, p. 94, 96. Helminthocladia purpurea 

 (Harv.) J. Ag. as interpreted by Collins, Holden and Setchell, 1900, in 

 P.B.A. No. 686. 



Thalli saxicolous, to 20 cm. high or more, from a simple discoid 

 holdfast, soft, lubricous, consisting of one or more indistinct, cylindrical 

 to compressed, irregularly multifariously branched main axes 3-5 mm. 

 in diameter, the branches cylindrical, of 1-3 orders, successively smaller 

 in diameter, usually little attenuated, the tips blunt; structure filament- 

 ous, the inner medullary region appearing more or less hollow, traversed 

 by sparse, loose filaments mostly 10-20 jx in diameter, these becoming 

 dense, congested and larger in diameter in the outer medullary region 

 (to 30 ju, diam.) and supporting a cortex of anticlinally arranged branch- 

 ed filaments terminating in catenate series of 2-3 short-clavate assimilat- 

 ing cells, each with a conspicuous stellate chloroplast lying within the 

 end wall; assimilating cells 14-19 /a in diameter; plants dioecious; anther- 



