Epicladia 225 



branched filaments. Chromatophore a homogeneous parietal layer 

 inclosing a pyrenoid. 



Reproduction by means of zoospores (gametes ?) of which many 

 be formed in a cell and escape through a round hole in the cell- 

 well. 



Type (and only species) E. flustrae Reinke. Inhabitant of 

 salt water. [Etym. ini, upon, and xlddo^, branch.] 



This genus is closely related to Endoderma, from which it differs 

 in its non-endophytic habit and in its greater tendency toward the 

 formation of an expanded thallus. Here the plate of cells is central 

 and in some sense primary, while in Endoderma it is only accidental, 

 that is, resulting from the coalescence of vigorously growing fila- , 

 ments. Epicladia thus seems to furnish a point of connection with 

 the genus Monostroma in the Ulvaceae. 



i. Epicladia flustrae Reinke, /. c. 



Cells of the central plate irregularly polygonal in outline, 7-12 

 fi in diameter [12-20 fx } Reinke], those of the free filaments short- 

 cylindrical or irregular, 5-10 jut in diameter (//. 42,/. 2). 



Exsic: Phyc. Bor. Am, 160, Spectacle Island, Penobscot 

 Bay, Maine, July, 1893 (F. S. Collins). 



Growing on Flustra, Serttdaria, and other bryozoa, often 

 among the masses of Fuciis between tide marks. 



New Hampshire: Hampton, July, 1884 (F. S. Collins). 



Massachusetts : Nahant, July (451) ; April, 1892 (F. S. Col- 

 lins). 



New York : Pelham Bay, May (408, 582). 



We have been unable to find this plant in New York waters in 

 summer and autumn. 



VI. ENDODERMA Lagerheim, Ofvers. Vet. Akad. F6rhand. 



1883 2 : 74, 75. 1883. Huber, Ann. Sci. Nat. Bot. VII. 16: 



313-326. pi. 14, 75. 1892. 



Entocladia Reinke, Bot. Zeitung, 37: 476-478. pi. 6. 1879. 

 Not Endocladia J. Ag. Linnaea, 15 : 449. 1841. 



Rcinkia Borzi. Notarisia, 3: 448. 1888 \nomen nndinn~\. 



Periplegmatium Hansg. Flora, 72: 58, 59. 1889. Not Kiitz. 

 Phyc. Gen. 273.//. J.f. j. 1845. 



