298 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



fronds in cross section showing a broad medullary area of large, thin- 

 walled cells and a 2-3 layered cortex of much smaller cells; cystocarps 

 occasional, protruding from compressed to flattened parts of fronds, 1500 

 fi diam., with a very small ostiole and an extensively branched, dendroid 

 gonimoblast structure; inner pericarp of flattened cells simulating a 

 crushed layer (a sort of "pericarpium proprium"). 



Type: D. 149, dredged in 4-32 meters off south shore of Tiburon 

 Island near Turner's Island, Jan. 25, 1940. Herb. AHF no. 38. 



D. 177, seine-haul over sand, just off south shore beach, Puerto Re- 

 fugio, Jan. 26, 1940. 



Gracilaria guaymasensis sp. nov. 

 Plate 70, Fig. 2 (right) 



Frondes 3-4 cm. altae, valde ramosae, axibus multis e disco basali orientibus, 

 prorsus compressis, segmentis 1.5-2 mm. latis, dichotomis, densis; internodis 2-5 

 mm. longis; apicibus obtusis; cystocarpiis globosis, L2-1.3 mm, diam., late sessili- 

 bus aut basim constrictis, carpostomio leviter elevato. 



Plants 3-4 cm. high, much branched, many axes arising from a simple, 

 discoid holdfast, compressed to flattened throughout, the segments 1.5-2 

 mm. wide; branching mainly dichotomous, close, internodes 2-5 mm. 

 long; apices blunt; outer cortical cells in cross section in a palisade, 5 by 

 10 fi'y cystocarps abundant on upper branches, large, globose, 1200-1300 

 /x diam., entirely superficial, broadly sessile or commonly constricted about 

 the base, with a small, slightly raised ostiole ; placenta typically gracilari- 

 oid, of large, elongated, thin-walled cells. 



Type: D. & R. 3401 (Field Museum; isotype, AHF no. 39), in 

 intertidal pools, Punta San Pedro, near Guaymas, Dec. 22, 1939. 



Known only from a single collection but distinct in habit and in 

 morphology of cystocarps from other known species, 



Gracilaria secundata S. & G. 



Gracilaria secundata Setch. & Gard., 1937, p. 78 (not of Harvey). 



Setchell and Gardner described a new species from a fragment of a 

 tetrasporic plant and erroneously gave it a name already used by Harvey 

 (Phyc. Austr. V, 1863, no. 432) for another species. The type of Setchell 

 and Gardner's plant is so fragmentary that it can only be considered an 

 interesting but indeterminable scrap. 



Further collecting in the sublittoral off San Jose del Cabo may reveal 

 sufficient material later for the establishment of a name. 



