538 University of California Publications in Botany [Vol. 8 



25. Endarachne J. Ag. 



Fronds plane, entire, ecostate, solid, attached by a small solid 

 disk, composed of three quite distinct tissues, a surface tissue of more 

 or less cuboidal cells holding the plastids, merging below into larger, 

 thick-walled, slightly parenchymatous cells which in turn merge into 

 the medulla, composed of very thick-walled, densely intertwined, 

 branched filaments extending longitudinally for the most part ; repro- 

 duction by plurilocular gametangia forming a palisade layer over the 

 whole frond except the stipe ; paraphyses unknown ; hairs in fascicles. 



J. G. Agardh, Analecta Alg., Cont. 3, 1896, p. 26. 



The type species of the genus is Endarachne Binghamiae collected 

 by Mrs. Bingham in the vicinity of Santa Barbara, California. So far 

 as is known at present, this is the only species of the genus. 



In the genus Ilea, the central cells of the medulla are, at times, 

 more or less elongated, but there is no such conspicuous development 

 of hyphal tissues as is to be found in the present genus. Endarachne 

 resembles forms of Ilea Fascia so closely in general appearance that it 

 is necessary to examine sections to distinguish them with certainty. 



Endarachne Binghamiae J. Ag. 



Plate 38, figs. 37, 38, and plate 83a 



Fronds usually aggregated into clusters, 10-18 cm. high, 1-3 cm. 

 broad, linear to broadly spatulate, at times irregular in outline, usually 

 eroded above at maturity, with cuneate base and distinct, small, short 

 stipe ; color dark brown, young plants usually turning green on drying ; 

 gametangia formed by horizontal division of surface cells, 44-50/* long, 

 4-5/x diam., with uniseriate loculi, all enclosed by a common cuticular 

 layer. 



Growing on rocks in the middle and upper littoral belts. Southern 

 California and as far as Ensenada, Lower California. 



J. G. Agardh, Analecta Alg., Cont. 3, 1896, p. 26, pi. 1, fig. 5; 

 Saunders, Phyc. Mem., 1898, p. 162, pi. 30, figs. 6, 7 ; Collins, Holden 

 and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 1593; Okamura, Alg. 

 Japon. Exsicc, no. 86. Phyllitis Fascia Okamura, Illus. Mar. Alg. 

 Japan, vol. 1, 1901, pi. 10. 



