ERYTHROCLADIA 81 
filaments suggests that a disc is really a part of the plant. J. 
Agardh apparently considered Porphyra bangiaeformis a synonym 
of Bangia ciliaris and this opinion has been adopted by De-Toni 
in his “ Sylloge Algarum.” 
Erythrotrichia polymorpha, like Е. ciliaris and Е. discigera, 
differs markedly from the type species of Erythrotrichia in the 
presence of a basal disc and if this character is ever considered of 
generic importance, the name Erythropeltis will doubtless be 
available for this generic group, but species with and without 
basal discs are still considered congeneric in Acrochaetium (Chan- 
transia) and it is quite conceivable that forms of Erythrotrichia 
will be discovered that would make the suggested generic segrega- 
tion seem forced and arbitrary. 
PLATE 29. Erythrotrichia polymorpha 
1-7. ane: E in the development of the basal disc, beginning with the саа 
п Chaetomor pha. 
8. А well-developed basal disc on Chaetomor pha, with erect filaments (cells uniseriate) 
springing from its center. The disc produces spores in various parts, as at sp. 
9. A sector of a well-developed disc, becoming irregularly distromatic in central 
rts. The cell divisions are mostly vegetative but spores occur. 
то. A portion of the margin of a disc on Cladophora. Spores are shown 
11. Erect filaments (cells uniseriate) and margin of basal disc (in optical as id on 
Cladophor 
I2. Ап erect vina with cells ет 4-seriate above, оп о 
13. Ап erect filament with cells riate above, оп Glossophor 
14. An erect filament with cells тепме пие оп Lessonia. 
15. Spores апа accompanying steril m the filament-bearing basal disc shown 
in Fig. 8 
16. Spores, etc., from a disc that bears no filaments—also on Chaetomor pha. 
17. Portion of a spore-bearing erect filament with cells 8-seriate above, on Spato- 
glossum. 
F ы. І-12, 15, and 16 аге drawn from the type material (Chincha Islands, 
Coker 106 p.p.); 13, from Coker 403 p.p. (Chincha Islands); 14, from Coker 197 p.p. 
(Chincha Islands); 17, from Coker 145 p.p. (Islands of Lobos de Afuera). Figures 
1-7, 9-13, and 15-17 are enlarged 345 diameters; 8, 66 diameters; 14, 232 diameters. 
ERYTHROCLADIA Rosenv. Kgl. Danske Vidensk. Selsk. 
Skrift. УП. 7: 71. 1909 
Erythrocladia endophloea sp. nov. 
Endophytic or pseudo-epiphytic, creeping in the superficial 
cell walls of other algae; thallus minute, consisting at first of 
е irregularly radiating filaments, becoming at length 
