NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 95 



3. Blades divaricately dichotomously branched M. divaricata 



3. Blades simple or lobed 4 



4. Tetrasporangial sori minute, scattered over entire blade 



M. hollenbergii 



4. Tertasporangial sori large (to 4 mm. in diam.) occupying 

 most of the middle and upper blade areas M. osorioi 



Myriogramme hollenbergii Kylin 



PL 46, fig. 5-7 

 Kylin 1941, p. 32, pi. 11, fig. 30; Smith 1944, p. 346, pi. 88, fig. 2-4; Dawson 

 1951, p. 53. 



Thalli 1-2 cm. tall, bright red, with a disc-shaped base support- 

 ing a short stipe, the stipe terminating in a blade and at times bearing 

 lateral blades; blades 5-10 mm. tall, 2-3 (5) mm. broad, narrowly to 

 broadly ovate, at times with one or two incisions at the apex, monostro- 

 matic throughout, without veins; spermatangial sori lunate, on upper 

 part of blade; cystocarps usually limited to two or three on a blade; 

 tetrasporangial sori minute, irregularly shaped, scattered over entir-' 

 blade. 



Type: A collection by G. J. Hollenberg, July 18, 1939, in Herb. 

 Agardh, Lund University, Sweden. 



Type locality: On piling, Municipal pier, Monterey, California. 



Mexican distribution: Pacific Baja Calif. — D. 8001, Cortez 

 Bank, off California-Mexico boundary, 27-35 m.; D. 9276, Punta 

 Entrada, Isla Magdalena (corresponds except for numerous cystocarps 

 scattered over blades and somewhat less prominent stipe than the type). 



Myriogramme spectabilis (Eaton) Kylin 

 PI. 46, fig. 2 

 Kylin 1924, p. 58; Dawson 1949, p. 223. Nitophyllum spectabile Eaton 1877, 

 p. 245. 



Thalli usually epiphytic, 10-20 cm. high, rose-red, consisting of a 

 prostrate system bearing erect, short-stipitate blades; blades narrowly 

 fan-shaped to irregularly palmately incised into ligulate segments 5-10 

 mm. broad or more, without midrib or veins, the margins entire, seldom 

 proliferous, the apices blunt and rounded; spermatangia in areolate 

 patches; cystocarps scattered irregularly over both surfaces of blades, 

 500-600 p. in diam.; tetrasporangial sori small, elliptical, closely spaced 

 over blade surfaces. 



Type: An Anderson collection presumably in the Farlow Herbar- 

 ium, Harvard University. 



Type locality: Santa Cruz, California. 



Mexican distribution: Pacific Baja Calif. — D. 6486, Bahia Col- 

 nett (7-12 m.) ; D. 5172, Cabo Colnett; D. 9648, 9681, peninsula of 

 San Quintin; D. 2755, Socorro, north of Punta Baja; D. 8446, Isla 

 Guadalupe 90 m. (an atypical, deep-water form) 



