NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 43 



cqstocarpi subspherici c. 90 ft diam., aliquot lobos humiles irregulares habentes, 

 in partibus thalli fertilibus ramossissimis, partibus sporangialibus similibus 

 nati. 



Thalli tufted, to 2.5 cm. tall, consisting of many erect, branched axes 

 from a dense mass of rhizoids forming a felted attachment; erect axes 

 125-170 /x in diam. at the base, more or less loosely clothed in lower 

 parts by entangled rhizoids, of cells (1) -1.5-2.0 diameters long, 

 essentially distichously branched, the branches mostly simple, very long, 

 at first strongly incurved, then irregularly curved or recurved, somewhat 

 entangled (sometimes terminally uncinate) 60-70 jx in diam., little 

 attenuated, the tips rather sharply reduced but blunt, sometimes pro- 

 longed to form a rhizoid; polysporangia borne in special, densely 

 branched parts of thallus, the branches short, irregular, bearing groups 

 of alternate, sessile, spherical polysporangia about 60 \i in diam., 

 containing 32 ( ? ) spores ; cystocarps subspherical, about 90 /.<. in diam., 

 with several low, irregular lobes, borne in densely branched fertile parts 

 of thallus similar to sporangial ones. 



Type: Holotype is E. Y. Dawson 3774, Jan. 9, 1947, in Herb. 

 Beaudette Foundation. 



Type locality: Salina Cruz, Oaxaca, Mexico. 



Additional material: D. 3783, D. 3814a, Salina Cruz, Oaxaca. 



Haloplegma mexicanum Tayl. 



Taylor 1945, p. 262, pi. 86, fig. 1. 



Plants to 10 cm. tall, tufted, rose-pink above, discolored below, 

 flabellately expanded, the branching irregularly alternate from the 

 margin, the branches crenate to irregularly pinnately lobed or again 

 branched, spongy throughout, above very thin and delicate, but below 

 thicker; internally consisting of branched, uniseriate, longitudinal 

 filaments supporting a network of filaments in quadrilateral mashes 

 which at the surface of the plant bear groups of erect, sharp-tipped, 

 free, alternately branched filaments 7-8 cells in length, the cells 1-2 

 diameters long, 25-35 \x in diam. (from Taylor). 



Type: Taylor 39-644, May 9, 1939, in Herb. A. Hancock 

 Foundation. 



Type locality: Dredged from a bottom of coralline and other 

 algae at Hancock Station 970, Isla Maria Magdalena, Islas Tres 

 Marias, Mexico. 



Lejolisia colombiana Tayl. 



PL 17, fig. 1-5 

 Taylor 1945, p. 265, pi. 4, fig. 3-10 



Thalli small, tufted, the basal filaments creeping, to 24 ll in diam., 

 the branches chiefly erect, to 3-5 mm. tall, little tapered, about 18 /x 

 in diam., the cells about 100 jx long below, 70 [x long above, simple 



