1025] Setchcll-Gardiur: Melanophyceae 397 



Epiphytic on other algae. Gulf of California. 



Kuetzing, Tab. Phyc., vol. 5, 1855, p. 27. pi. 90, fig. II; Reinke, 

 Beitr. zur vergl. Anat. u. Morph. der Sphac, 1891, p. 14, pi. 4, figs. 

 5-13; Sauvageau, Rem. sur Its Sphace., 1901, p. 156; Setchell and 

 Gardner, Mar. Alg. Gulf of Calif., 1924, p. 724, pi. 19, fig. 58. 



Kuetzing founded this species on a plant from the Island of Karak, 

 in the Persian Gulf. Reinke (Joe. cit.) and Sauvageau (lac. cit.) have 

 interpreted it, the former confining it to the Indian and Pacific oceans, 

 the latter extending it to the Atlantic Ocean and adjacent European 

 seas. According to Sauvageau 's interpretation our scanty material 

 may very well be included under the form cycle of S. furcigera, but we 

 doubt its conforming exactly to the type of Kuetzing. Our specimens 

 show scanty propagula and seemingly young oogonia. 



6. Sphacelaria didichotoma Saunders 



Erect filaments up to 4 mm. high, forming dense tufts, with prob- 

 ably a penetrating base, irregularly branched ; joints with as many 

 as 3 vertical partitions, 25-35/* diam., and slightly longer than broad ; 

 hairs not known ; propagula slender, bifurcate, with each ray again 

 furcate, stalk slightly attenuated at the base, 200-300/* long, main 

 branches 100-200/* long; sporangia and gametangia unknown. 



On other algae, including Melobesieae. Central and southern 

 California. 



Saunders, Phyc. Mem., 1898, p. 158, pi. 27. Sphacelaria variabilis 

 Sauvageau, Rem. sur les Sphace., 1901, pp. 160-162, fig. 37 ?. 



The species noted above is known to us chiefly from descriptions 

 and figures. A specimen from Clifton, California, collected by Carl 

 Epling, seems referable here. It is very uncertain (cf. Sauvageau, 

 loc. cit., p. 160) as to whether 8. didichotoma is identical with S. 

 variabilis Sauv., or with 8. divaricata Mont., or is distinct from both. 



2. Chaetopteris Kuetz. 



Frond arising from a solid parenchymatous base, cylindrical, 

 filiform, solid, parenchymatous throughout, irregularly divided into 

 longer and shorter branches, which in turn are pinnately branched ; 

 reproduction by unilocular zoosporangia and plurilocular gametangia 

 borne on special branchlets arising from the corticating pseudo- 

 parenchyma ; perennial. 



Kuetzing, Phyc. Gen. 1843, p. 293. 



