NO. 2 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 261 



Type locality: Golden Gate (San Francisco), California. 



Mexican distribution: Pacific Baja Calif. — D. 1099, in drift, 

 Ensenada, Apr. ; D. 8767, D. 8747, Jan., D. 9659, Apr., in drift, Punta 

 San Quintin; D. 9036, dredged in 55 m., Reciefe de Sacramento, Apr. 



Gryptonemia angustata (Setchell & Gardner) comb. nov. 



PI. 2, figs. 11-14 



Callymenia angustata Setchell and Gardner 1937, p. 77-78, pi. 12, 

 fig. 32; Dawson 1944, p. 285, pi. 68, fig. 1; Dawson 1945a, p. 24. 

 Kallymenia tenuifolia Taylor 1945, p. 214, pi. 72, figs. 1-4 (Non Cally- 

 vienia tenuifolia Feldmann 1939, p. 327). 



Three collections from Mexico have been compared with the type of 

 Callymenia angustata and found to be essentially identical. All of these 

 contain cystocarpic examples and one, a tetrasporic plant. An examina- 

 tion of the development of the cystocarp has shown that the plant does 

 not correspond with Callymenia as understood through the studies of 

 Kylin (1928) but shows the grateloupioid cystocarp, the non-nemathecial 

 tetrasporangia, and the structure of Cryptonemia as recognized by 

 Sjoestedt (1926). Fertile auxiliary cell systems were readily observed 

 because of their abundance, size, and conspicuously staining auxiliary 

 cells. Carpogonial branch systems were relatively obscure, but structures 

 which are interpreted as these were observed in several instances. They 

 are much smaller and more congested than the auxiliary cell systems 

 and with a reduced carpogonial branch closely surrounded by a group 

 of sterile cells. Figure 13 represents one of these in median optical view 

 in which the carpogonial branch was seen. 



On the basis of the material now available, the species as it occurs in 

 Mexico may be described as follows: Thalli 5-14 cm. high, membranous, 

 rose red, consisting of one to several slender, stipitate, oblanceolate blades 

 from a small, discoid holdfast; stipes very slender, compressed or flat- 

 tened, about 300 IX wide, 3-4 mm. long or more, expanding gradually 

 into the blade; blades simple, sometimes dichotomously divided, com- 

 monly developing proliferously from the ends of mutilated parts, with 

 rounded apices and entire margins, 7-13 (20) mm. wide, very thin, (35) 

 40-60 /i, thick; cortex consisting of 1-2 layers of small, irregularly ar- 

 ranged cells 5-10 IX in diameter, the inner ones usually somewhat larger 

 and more rounded; medulla narrow, of a few much-elongated, inter- 

 twined, mostly longitudinally arranged cells, which in older parts de- 

 velop firm, coalesced walls and form a ± solid tissue; tetrasporangia 



