NO. 1 DAWSON : MARINE RED ALGAE OF PACIFIC MEXICO 13 



Bangia enteromorphoides sp. nov. 

 Plate 1, fig. 8 



Thalli ad 2 mm. altis, ex aliquot frondibus erectis e haptero rhi- 

 zoidum congestorum; frondibus erectis cylindricis, simplicibus vel paucis 

 ramis calcariformibus prope basim; primo solidis, in seriebus 4 cellu- 

 larum, tum cavis, in seriebus circa 20 cellularum, supra ad 150 /t dia- 

 metro. 



Thalli epiphytic, to 2 mm. high, consisting of several erect fronds 

 from a holdfast of massed, semi-penetrating rhizoids arising as descend- 

 ing appendages of the lower cells of the erect fronds; erect fronds cyl- 

 indrical, simple or sometimes with a few spur-like branches not far above 

 the base, at first solid, about 20 /a in diameter and of 4 rows of cells, at 

 maturity hollow, with the upper parts to 150 /a in diameter and consist- 

 ing of about 20 rows of irregularly quadrate or angular cells ; basal parts 

 of mature fronds of about 6 rows of cells; apices broadly rounded; 

 antheridia borne in groups of 16-32 in upper parts of erect frond in a 

 clearly defined fertile area in which some sterile cells are scattered among 

 the antheridial cells ; carposporangia unknown. 



Type: Holotype is Dawson 3624a, Dec. 6, 1946, on slide 1139 in 

 HAHF. 



Type locality: Epiphytic on Gelidiuiii sderophyllum, intertidal 

 rocky shore just north of Olas Atlas lighthouse, Mazatlan, Sinaloa, 

 Mexico. 



This species differs from others heretofore known in the Pacific by 

 its multiseriate basal parts (even in young thalli) and by its short, thick, 

 hollow, erect fronds bearing short branchlets. 



Bangia fusco-purpurea (Dillwyn) Lyngbye 



Lyngbye, 1819, p. 83, pi. 24C; Taylor, 1937, p. 218, pi. 28, figs. 10- 

 12; Taylor, 1945, p. 132; Kylin, 1944, p. 8, figs. 2E-M; Kylin, 1925, 

 p. 6; Dawson, 1949, p. 219. Conferva fusco-purpurea Dillwyn, 1807, p. 

 54, pi. 92. 



Thalli saxicolous, filamentous, aggregated, dark purplish or brownish 

 in color, lubricous; filaments ± cylindrical, unbranched, to 10 cm. 

 long, at first uniseriate, 40-60 /x in diameter, attached simply by a basal 

 cell, consisting of cells mostly about half as long as broad with thick, 

 gelatinous lateral walls and thinner intercellular walls, later the attach- 

 ment augmented by descending intramatrical rhizoids from the lower 

 cells of the filament; mature upper filament parts to 150 ju, in diameter, 



