240 



The plant is densely ramified, and the branch lets, as well as the 

 ramuli, issue distichously from both sides of the branches, these 

 by this getting a beautifully feather-like appearance. The thallus 

 is terete and, with the exception of the ramuli, densely cortica- 

 ted. In the younger parts of the branches the cortical layer 



consists of alternating rows of 

 cells as described above for 

 the typical form, and like this 

 one the ends of the branches 

 and branchlets often end in 

 tendrils. 



The ramuli, too, except for 

 the absence, of the uncinate 

 spines, seem quite to agree 

 with those of the typical 

 form. They are bent upwards, 

 having a rather broad base, 

 about 60^, and tapering gradu- 

 ally towards their summit 

 which consists of a rather long, 

 mucronate tip. At the base 

 the cells are about as long as 

 broad, higher up about l 1 /^ as 

 long as broad. 



This species has been found 

 in shallow water in more or 

 less sheltered localities and in 

 deep water down to a depth 

 of about 30 meters. It is 

 mostly an epiphyte fastened 

 to other alga?. 



F. typica has been found in the 

 following localities : St. Croix : Near 

 Long Point and at Buck Island in 

 a depth of about 5 fathoms. 



Var. disticha. St. Croix: At the shore near the estate Cassava Gar- 

 den. St. Jan: Off America Hill in a depth of about 16 fathoms. 

 F. inermis. St. Croix: Near the shore at Green Cay Estate. 



Geogr. Distrib. : West Indies, Southern Atlantic shores of Europe, 

 Maroc, Mediterranean Sea, Red Sea. 



Fig. 230. Spyridia aculeata (Schimp.) 

 Kiitz. f. inermis n. f. Part of the 

 thallus and summits of two ramuli, 

 the one with a hook. (About 18 : 1 

 and 200 : 1). 



