416 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



10. Endoderma viride (Reinke) Lagerh. 



Once more I have found this plant upon Chrysymenia Agardhii. 

 Several of the specimens had zoospores, a smaller or larger 

 part of the cells in the middle of the plant being emptied. The 

 Fig. 397 a shows such a plant. It was gathered in the month of 

 January, and the host plant was dredged in deep water about 

 30 meter, at St. Jan: off America Hill. 



In several other plants I have found forms of Endoderma 

 which I think are referable to this species, even if they mutually 

 show differences both as to the shape of the cells and as to their 

 way of growing in the various host plants. 



In a specimen of Champia salicornoides an Endoderma was 

 found of which the Fig. 397 b shows a small piece. As is seen 

 from the figure it forms a network composed of the jointed branch- 

 ing filaments which follow the outlines of the large wall cells 

 of the host plant in a way very similar to that found in forma 

 Nitophylli Cotton ^). If we compare Cotton's figure 1 with my 

 figure the likeness seems very striking. The diameter of the cells 

 is about 3 — 6, the thickest cells reaching a breadth of up to 10 //. 

 The cells were crammed with starch, and the shape of the chrom- 

 atophore was not recognizable. This plant was dredged in deep 

 water about 15 fathoms in the Sound between St. Jan and 

 St. Thomas: near Great St. James. 



A very similar form was found in Champia parvula. Fig. 397 d 

 shows a small piece of this Endoderma. The cells are a little shorter 

 here, but the breadth of the cells are nearly the same as in the 

 case of the form found in Champia salicornoides. It was dredged 

 off Frederikssted, St. Croix, in a depth of about 10 meters. 



In the epidermis of Chrysymenia Enteromorpha an other 

 form (Fig. 397 c) was found which I think also can be referred 

 to End. viride. It grows in a way similar to that of the above 

 mentioned form following the outlines of the large membrane 

 cells. It is a somewhat larger plant, its cells being from 6 to 14 /^ 

 broad. The shape of the cells is more irregular than in the former 

 plant. In many of the cells the formation of zoospores was pre- 

 sent and several cells were emptied of their contents. It was dredg- 

 ed off Cruz Bay, St. Jan, in a depth of about 12 fathoms. 



^) Cotton, A. D., On some endophytic Algæ (Journ. of the Linnean Soc, 

 Bot., vol. 37, 1906, p. 288, pi. 12). 



