NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 87 



Mexican distribution: Pacific Baja Calif. — Cooper 866, Dawson 

 189, 240, 272, 8039 (Hubbs), vie. of Punta Descanso; D. 1264 

 (Johnson) Bahia Soledad; D. 9746 (Hubbs) Punta Banda; D. 9691, 

 outer peninsula of San Quintin; D. 1264, 1137, 8672, 8865, Punta 

 Baja; D. 8370, Isla Guadalupe; D. 9834, Isla Cedros; D. 10347, Punta 

 Eugenio; D. 9101, Islas San Benito; D. 9231, Punta Pequena, Bahia 

 San Juanico; D. 9038, 9263, 9356, Isla Magdalena (ocean side). 



Several of these specimens, especially those from Punta Pequena 

 (pi. 42. fig. 1) and some from Isla Magdalena, are of an exceedingly 

 narrow form in which the blades are linear, only 1.5-2 mm. wide and 

 the teeth proportionally very prominent. 



Tentative Working Key to the Species of Phycodrys 

 1. Plants 10-22 high, the blades usually with marginal branches 



or lobes which grow out to form segments 3 



1. Plants smaller (3-5 cm.) the blades simple (or with occasional 



proliferous marginal bladelets. in P. profunda) 2 



2. Blade margins smooth 



P. simplex sp. nov. (Gulf of Calif.) 



2. Blade margins denticulate, some of the teeth growing out 



into rhizoids 



P. profunda sp. nov. (Calif, and N.W. Mexico 



3. Blade margins smooth 4 



3. Blade margins ± prominently denticulate, dentate or serrate, 



at least in part 6 



4. Alae becoming bullate in age; vegetative regeneration by 



"budding"; reproduction unknown 



P. bullata Gardner (Alaska) 



4. Not as above 5 



5. Tetrasporangia forming an irregularly continuous marginal 



band P. ambigua Gardner (Alaska) 



5. Tetrasporangia borne in paired, elongate patches on either 



side of midrib of ultimate segments- 



P. elegans Setch. & Gard. (Galapagos Isl) 4 4 



6. Plants abundantly proliferous from midribs as well as 



margins P. austrogeorgica Skottsberg (So. Georgia) 



6. Plants not abundantly proliferous from midrib, although 



sometimes dz marginally proliferous 7 



'When Taylor (1945, p. 279) described Phycodrys pulchra he said: "They differ 

 [from P. elegans S. & G.] in minor respects [and] may prove to be nothing 

 more than a particularly luxuriant variety [of that]." His fine array of Gala- 

 pagos specimens appear to me to be completely identical with the tetrasporan- 

 gial Setchell and Gardner material, and a further Galapagos collection (AHF 

 66-33) that is intermediate between the broad plants of Taylor and the narrow 

 type of P. elegans, allows me to make this reduction without hesitation. 



