24 



4. Cladophora fascicularis (Mert.) Kiitz. 



Kltzing, F., Phycologia generalis, 1843, p. 268. 

 VicKERs, A., Phycologia Barbadensis, p. 18, pi. XIII. 



Cladophora fascicularis is a rather variable plant. The cells 

 in the main filaments are about 200 n thick and most often rather 

 short, 2 — 4 diam, long, but sometimes also specimens with some 

 longer cells occur and these forms then come near to Cladophora 

 heteronema. 



This species seems to be rather common at St. Croix where 

 it occurs in the more protected localities behind the reefs, often 

 in large entangled masses. It is most often met with in quite 

 shallow water, once it was found in a depth of about 12 meters. 



St. Croix: Lt. Princess, off Frederikssted, Lime Tree Bay. 



Geogr. Distrib. West Indies, Florida, Brazil, Red Sea. 



5. Cladophora crispula Vickers. 



VicKERS, A., Liste des algues marines de la Barbade (Ann. Sci. Nat., 

 Ser. 9, Bot., vol. 1, 1905, p. 45); Phycologia Barbadensis, p. 19, pi. XVI. 



The specimens referred to this species were found often 

 abundantly as loose-lying, spongy masses entangled among 



sea-grasses. Most of the speci- 

 mens seem to be in good ac- 

 cordance with the forms described 

 by NF« Vickers. From some 

 older thicker fdaments, often up 

 to 60 — 80 [J. thick, young thinner 

 fdaments grow out varying in 

 thickness from 35 — 50 /i. These 

 thinner fdaments are more or 

 less curved and twisted together 

 forming in this way the spongy 

 masses (Fig. 15). 



In the sea to the west of 

 Water Island at St. Thomas in a 

 depth of about 40 meters, a Cladophora (my collection no. 1166) 

 was found forming very similar spongy masses. The main fda- 

 ments were about 100/^ thick, the thinnest ramuli about 30 //, 

 the cells in the fdaments were rather long often up to 8 diam. 

 This form seems to come near to some forms of Cladophora hete- 

 ronema. 



Fig. 15. Cladophora crispula Vickers 

 Part of a filament. (About l."):l). 



