NO. 1 DAWSON : MARINE RED ALGAE OF PACIFIC MEXICO 121 



diameter, urn-shaped, long-antenniferous from prominent shoulders; 

 antheridial conceptacles elongate ellipsoid, about 150 ^u, in diameter, 300 

 fjL long, terminal, pedicellate, non-antenniferous ; carposporangial con- 

 ceptacles similar to tetrasporangial ones. 



Type: Holotype is Kiitzing's original specimen in the Rijksher- 

 barium, Leiden, Holland. Two isotype fragments are on slide 1251 in 

 HAHF. 



Type locality: Naples, Italy. 



This species is interpreted from the fragments cited. They were 

 obtained through the courtesy of Prof, H. Lam and Dr. Josephine 

 Koster of the Rijksherbarium, Leiden. One of the fragments is shown 

 in plate 9, figure 3. It was taken from the upper part of a plant 1.5 cm. 

 high. The segments are mostly 100 /* in diameter, some to 120 (x, and 

 2^-3^^ (or to 4) diameters long. The specimens referred here are 

 those within the diameter range of the type and with relatively short 

 segments, mostly 3-5 diameters long. Such plants occur along the Pacific 

 Coast of southern California and Baja California but are confined to 

 distinctly warm localities. 



Pacific coast distribution: California — D. 6068, Cardif, Jan. ; 

 D. 5442, La Jolla, Oct.; AHF 1431-41, Santa Catalina Island, Sept. 

 Northwestern Baja Calif. — Hubbs, Feb. 6, 1951, south side of Bahia 

 de Todos Santos; D. 2867, just south of Punta Santa Rosalia, Oct.; 

 D. 2973, Millers Landing, Oct.; Hubbs 46-205, Islas San Benito, Aug.; 

 D. 8161, 8591, 8220, Isla Guadalupe, Dec; D. 9946, South Bay, Isla 

 Cedros, Apr., D. 9933, 10049, 10484, 10-17 miles west of Punta Mal- 

 arrimo, Apr., Nov. Southern Baja Calif. — D. 3296, Punta Palmilla, 

 Nov.; D. 3318, Cabeza Ballena, Nov.; D. 3091, Cabo Pulmo, Nov. 

 Costa Rica — Crocker 34, Port Parker, Jan. 



Jania tenella var. zacae var. nov. 

 Plate 8, fig, 3; Plate 31, fig. 1 



Thallis epiphyticis, 1.0-1.2 cm. altis, frondibus compluribus erectis 

 ramosis e disco parvo; ramificatione ubique dichotoma, acutangula; 

 intergeniculis compressis vel ubique complanatis, infra 130-160 /x latis, 

 plerumque 2-2.5 diametris longis, supra minoribus. 



Thalli epiphytic, 1.0-1.2 cm. high, forming separate and widely 

 spaced tufts on the host, consisting of several erect, branched parts from 

 a small disc about 1 mm. in diameter; branching dichotomous through- 

 out, not very dense, the angles quite narrow; intergenicula compressed 



