1920] Setchell-Gardner: Chlorophyceae 289 



Reinke, Zwei par. Algen, 1879, p. 476. Endoderma Lagerheim, 

 Bidr. Sver. Alg., 1883, p. 74. Entoderma Wille, Chlorophyceae, in 

 Engler and Prantl, Natiirl. Pflanzenfam., 1890, p. 94. 



It seems desirable to restore the earlier name of Entocladia, since 

 it dift'ere in one letter from the earlier EndodmJia J. Ag. (1841) and 

 belongs to an entirely different class of algae. There seems, therefore, 

 to hv liltU' likelihood of any serious confusion. The genus is now 

 credited with several species, some of which occasionally possess hairs. 

 It seems best to us to restrict the generic name to species without 

 hairs. One characteristic of the genus is supposed to be the habitat, 

 viz., growing within the cell membranes (or cuticula?) of various 

 green, brown and red algae. It does not seem to us that this manner 

 of growth ought to receive too great emphasis in determining the 

 generic limits. Removal of this, as a criterion of generic distinction, 

 would probably result in the combination of the genus Epicladia 

 Reinke witli the genus Entocladia Reinke. Since we have not as 

 yet detected a species of Epichdia on the Pacific Coast, we may leave 

 discussion of tliis point to others, but we may instance the genus 

 Coleochaete as possessing a species endophytic in tlie membranes of 

 tlie segments of Nitella while most of the rest of the species are 

 epiphytic. 



Key to the Species 



1. Filaments scarcely if at all coalescing 1. E. viridis (p. 289) 



1. Filaments coalescing, at least at the center 2 



2. Free filaments numerous and long 2. E. codicola (p. 290) 



2. Free filaments few, short 3. E. cingens (p. 291) 



]. Entocladia viridis Reinke 



Filaments branching freely, 3-8ju, diam., cells 1-6 diam. long, 

 cylindrical, or more often irregularly swollen and contorted ; chromato- 

 phore nearly covering the cell wall and containing a single pyrenoid. 



Growing on Callithamnion Pikeanum. Central California (Moss 

 Beach, San Mateo Co.). 



Reinke, Zwei par. Algen, 1879, p. 476, pi. 6, f. 6-9. Endoderma 

 viride Lagerheim, Bidr. till Sver. Alg., 1883, p. 74 ; Collins, Green Alg. 

 N. A., 1909, p. 279; Collins, Holden and Stechell, Pliyc. Bor.-Amer. 

 (Exsicc.),no. 2236. 



We have not been able to make a satisfactorily extensive study f)f 

 the Entocladia species apparently not uncommon in the cell and otlici- 

 membranes of our various marine algae. Consequenth' we have 



