NO. 2 DAWSON : MARINE RED ALGAE OF PACIFIC MEXICO 295 



Type locality: San Pedro, California. 



Mexican distribution: Pacific Baja Calif. — Gardner 7127a, 20 

 miles south of Tijuana, Dec. (in Herb. U.C.) ; Cooper 861, near 

 Descanso, Mar.; D. 9705, Apr,, D. 8760, Jan., near Punta San 

 Quintin; D. 8870, 8916, Punta Baja, Jan. 



The abundant branching, successively reduced segments and the 

 small, projecting, marginal cystocarps usually suffice to distinguish this 

 species. CallophyUis odonthalioides Setchcll should probably be reduced 

 under C. marginifructa, for the aggregation of the cystocarps mostly "on 

 tips of lateral lobes" appears in the rather fragmentary type to be more 

 accidental than genetical. The distinction from C. crassifolia, which 

 seems to be only a matter of thickness of the vegetative thallus has also 

 been questioned. (Mid-parts of the type of C. crassifolia are about 600 

 fi thick). Doty has reduced it under C. rnarginifructa, which he in turn 

 places under C. flabellulata. 



GallophylHs megalocarpa Setchell & Swezy 

 PI. 5, fig. 46; pi. 34, fig. 81 



Setchell 1923, p. 401; Kylin 1941, p. 16; Smith 1944, p. 251, pi. 

 59, fig. 1; Dawson 1945c, p. 66; Doty 1947, p. 174. CallophyUis 

 violacea J. Ag., as interpreted by Taylor 1945, p. 217; as interpreted by 

 Dawson 1945c, p. 65 as to number 99-45 only. 



Thalli 12-22 cm. high, usually saxicolous, dull rose-red in color, 

 consisting of one or a few branched, erect, short-stipitate, complanate 

 fronds from a simple, discoid holdfast; branching irregular, dichotomo- 

 pinnate, usually appearing to be more definitely dichotomous below and 

 more pinnate above, moderately strict, the segments short and broad, 

 0.5-1.5 (2.0) cm. broad in lower and middle parts; ultimate segments 

 indefinite, the major ones incised into numerous small, blunt or semi- 

 acute segments ; margins entire, or with sparse, coarse dentations repre- 

 senting dormant branchlets, or also sometimes with simple or incised 

 proliferous bladelets; thickness of mature thallus 380-600 ju,; cortex 

 thin, of an outer 1 or 2 layers of closely spaced and anticlinally elongated 

 very small cells 4-5 /* in diameter, and an inner partial layer or two of 

 somewhat larger pigmented cells; tetrasporangia cruciate, 30-37 fi long, 

 12-17 fi wide, scattered through the cortex with little nemathecial modi- 

 fication, projecting inward between the cells of the subcortex; cystocarps 

 scattered over the surfaces of the blades, 1.0-1.5 (2.5) mm. in diameter, 

 the larger ones older and in lower parts of blades, projecting prominently 



