NO. 1 TAYLOR: PACIFIC MARINE ALGAE 287 



DASYAC.Agardh, 1824 



Plants erect, more or less bushy, with stout main branches covered 

 with filiform branchlets ; axis with 5 pericentral cells generally externally 

 covered by a rhizoidal cortication ; branchlets crowded, scattered, whorled 

 or spirally inserted, sometimes polysiphonous at the base, uniseriate above, 

 pseudodichotomously branched, the tips generally delicate; tetrasporangia 

 in distinctive enlarged stichidial branchlets, the sporangia exposed at 

 maturity; spermatangia in fusiform to subcylindrical clusters formed on 

 the bases of lateral filaments; cystocarps in ovate or vasiform ostiolate 

 pericarps, which are apparently short stalked. 



Dasya Stanfordiana Farlow 

 Plate 97, Fig. 2 



Farlow 1902, p. 94. 



These plants reached a height of 25 cm, considerably above Farlow 's 

 largest recorded specimen. His plants came from I. Wenman and I. 

 Isabela. The pericarps, which he does not record, are short stalked, a 

 little broader than long, and the pore is slightly elevated. 



Mexico: Is. Revilla Gigedo, dredged from 22 meters' depth at sta. 

 970 near I. Maria Magdalena, Las Tres Marias, no. 39-648, 9 May 

 1939. Ecuador: Archipielago de Colon, dredged at sta. 157 from 18- 

 32 meters' depth off Tagus Cove, I. Isabela, no. 34-191, 15 Jan. 1934. 

 Ibid., dredged at 27 meters' depth off Post Office Bay, I. Santa Maria, 

 720. 34-278 (tetrasporic), 19 Jan. 1934. Ibid., dredged at 12-18 meters' 

 depth, no. 34-363, 27 Jan. 1934. Ibid., dredged at 55 meters' depth, no. 

 34-374 (tetrasporic). Ibid., dredged in abundance from a rocky bot- 

 tom at 36-55 meters' depth near an islet in Gardner Bay, I. Espanola, 

 no. 34-422 (tetrasporic and cystocarpic), 31 Jan. 1934. Ibid., dredged 

 from 20 meters' depth, Schmitt no. 356B-34 (cystocarpic), 17 Dec. 1934. 

 Ibid., dredged from 36 meters' depth, Schmitt no. 362E-34, 19 Dec. 1934. 



HETEROSIPHONIA Montagne, 1842 



Thallus chiefly erect, dorsiventrally organized, the stem commonly 

 compressed ; apex commonly a little recurved, branching alternate, bilat- 

 eral, producing secondary axes and determinate branchlets; branchlets 

 subdichotomous, monosiphonous above, but polysiphonous near their bases, 

 or either polj^- or monosiphonous throughout ; axes with four or more peri- 

 central cells, generally becoming enclosed by a rhizoidal cortex; tetra- 

 sporangia in distinctive stichidia, the sporangia remaining enclosed by the 

 cover cells ; spermatangial clusters generally elongate, acute, with a poly- 

 siphonous base ; cystocarps in ovoid to urn-shaped pericarps. 



