418 



filaments. As it is seen from the figure the irregularly branched fila- 

 ments are composed of cells of rather varying shape. Near the apex of 

 the filaments the cells are subcylindrical,but they soon obtain a very 

 irregular shape often with several outgrowths and narrowings in be- 

 tween. In older parts of the plant the filaments are packed so closely 

 together that they form an almost pseudoparenchymatous tissue 

 (comp. Fig. 399 d). The cells are 8 11 14 a sometimes up to 

 20 /Jt broad, and two to four times as long. They have a large 

 parietal chromatophore with a few pyrenoids (1 3). All the cells 

 may be transformed into zoosporangia. The zoospores escape by 

 means of a hole in the cell-wall. I refer this Endoderma, as a 

 forma ma/or, to E. viride. 



The Caulerpa was gathered in Christianssted's Lagoon, St. 

 Croix. 



11. Endoderma vagans nov. spec. 



Thallus endophyticus, in membranis hospitis (Griffithsise 

 globiferss) valde circumvagabundus, e filamentis repentibus, 

 articulatis, irregulariter ramosis compositus; cellula? subcylindricse, 

 5 13 n latae, diametro 2 4 plo vel ultro longiores, in media parte 

 saepe tumorem unilateralem vel rarius cellulam parvam gerentes; 

 chromatophora parietalia, pyrenoideis pluribns instructa. 



Zoosporse numerosse in cellulis vegetativis ortee. 



In the thick peripheral membrane of Griffithsia globiiera a 

 highly ramified Endoderma w r as found which I consider the 

 representative of a new species (Fig. 400). In the specimen of 

 Griffithsia, in which it was discovered, it was found in abundance 

 and formed a reticular plate all round the cell of the host. In 

 dried material the Endoderma had a clear green colour. Its cells 

 are of very varying dimensions from 5 to 13 ^ thick or more, 

 and from 18 to more than 50 // long. The shape of the cells is 

 much varying, too; in most cases the cells are nearly cylindrical, 

 or they may have an elevation on the one side, more seldom 

 two opposite, one on each side. From this elevation a new branch 

 frequently originates, but it may happen, that it is cut off by a 

 wall, thus remaining as a small cell (Fig. 400 a). 



The cells contain a large disc-formed chromatophore, cove- 

 ring nearly the whole lumen of the cell; in the chromatophore 

 several pyrenoids (about 5 7) are present (Fig. 400 c, d). The 



