1920] S&tchell-Gardner : Phycological Contributions 293 



E. viridis, E. codicola, and E. cingens form a well connected series, 

 using the vegetative characters as a basis. The first named species 

 has a rather wide spreading thallus, composed of relatively sparsely 

 branching filaments, scarcely, if at all, coalescing in the center. In 

 the second the filaments coalesce freely in the center so that at least 

 half of the thallus is formed into a pseudoparenchymatous tissue at 

 the time of reproduction, but leaving an abundance of free branching 

 marginal filaments. The thallus of the third is almost wholly trans- 

 formed into a pseudoparenchymatous tissue at maturity leaving only 

 a few free marginal filaments. 



Entocladia codicola sp. nov. 



Plate 24, figures la, 7b 



Filamentis laete viridibus, profuse ramosis, maturitate stratum 

 continuum centrale ad peripheriam terminos liberos et attenuatos ex- 

 hibens formantibus ; cellulis juvenis 3—1^ diam., 1-2.5-plo diam. longi- 

 oribus, terminantibus gracilibus et conicis; cellulis thalli centralibus 

 5— 8/x diam. ; pyrenoidibus singulis ; generatione ignota. 



Filaments light green, branching profusely, at maturity forming 

 a continuous layer in the center of the mass with many tapering free 

 ends around the margin ; young cells 3-4/i, diam., 1-2.5 times as long, 

 terminal cells slender and conical ; cells in the center of the thallus 

 5-8/i. diam. ; pyrenoid single ; reproduction unknown. 



Growing in the membrane, at the tips of the utricles of C odium 

 fragile. Central and southern California. Type no. 4121, Gardner. 



Entocladia codicola seems closely related to Entocladia viridis 

 Keinke (1879, p. 476, pi. VI, figs. 6-9), found growing in the mem- 

 brane of Derhesia; but it is a larger plant with the filaments much 

 more compact in the center, forming in fact a pseudoparenchymatous 

 disk with free filaments around the margin. The cells are shorter 

 than those of E. viridis, some being even shorter than the diameter. 

 In the pseudoparenchymatous character of the center of the disk-like 

 frond it resembles Entocladia Flustrae Reinke (1888, p. 241, nomen 

 nudum, 1889, p. 31, pi. XXIV, 1889a, p. 86), but the dimensions given 

 for that species are in general greater than those in ours. Repro- 

 ductive bodies have been observed in the cells of the central portion 

 of the disk in E. codicola, but the nature of these, their method of 

 escape, and their subsequent behavior have not been determined. Until 

 more is known concerning these later phases of the plant, its proper 

 placing must remain somewhat in doubt. It is here ])rovisionally 

 placed with Entocladia on account of its endophytic habit of growth. 



