10 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



unter dem Namen Erythrotrichia investiens) stellt eine ganz andere Art 

 als E. californica dar. Bei E. tetraseriata besteht jedes died in den 

 reifen Faden aus vier Zellen; die Chromatophoren sind bandforming." 



Erythrotrichia carnea (Dillwyn) J. Agardh 



J. Agardh, 1883, p. 15; Smith, 1944, p. 164, pi. 35, figs. 3-7; Daw- 

 son, 1944, p. 252; Newton, 1931, p. 242, figs. 147 A-C; Taylor, 1937, 

 p. 217, pi. 28, figs. 13-15; Tanaka, 1944, fig. 13. Conferva carnea 

 Dillwyn, 1805, p. 54, pi. 84. 



Thalli epiphytic, filamentous, 1-2 mm, long, erect, simple, 10-20 /x 

 in diameter, for the most part uniseriate, of quadrate cells tending to be 

 longer than broad, the lowermost cell narrower than those above and 

 producing short lobes at its point of attachment; filaments more or less 

 biseriate above in regions of monosporangia production. 



Type: Holotype not designated and the whereabouts of the 

 original material collected by W, W. Young, Sept. 1805, unknown to 

 the writer. It is not among the Dillwyn types at the Linnaean Society, 

 London. 



Type locality: Epiphytic on other algae from rocks of Loughor 

 River near its confluence with the sea, Glamorganshire, Wales. 



Mexican distribution: Pacific Baja Calif. — Hubbs 8/17/46, on 

 Blossevillea (Cystophora), Isla Guadalupe, Aug.; D. 2916a, on Gelid- 

 ium, Punta Santa Rosalia, Oct. Gulf of Calif. — D, 3161, on Padina, 

 Cabo Pulmo, Nov. Guerrero — Hubbs 46-234, on Chaetomorpha, Aca- 

 pulco Harbor, Sept. (fertile). 



The small size and slender proportions of most of the Mexican 

 plants permit them to be referred to the forma tenuis Tanaka (1944, p. 

 92, figs. 13B-E). 



Erythrotrichia ciliaris (Carm.) Batters 



Plate 1, fig. 2 



Batters, 1900, p. 374. Bangia ciliaris Carmichael, in W. J. Hooker, 

 1833, p. 316. 



Thalli epiphytic, to 1 mm. high, consisting of a monostromatic basal 

 disc from which numerous unbranched, erect, cylindrical to compressed 

 or subclavate filaments arise; erect filaments uniseriate below, 15-20 fi 

 in diameter, of cells shorter than broad, becoming tetraseriate above and 

 to 30-40 ju, in diameter, the cells more or less isodiametrical ; monospor- 

 angia not observed with certainty. 



