F. Borgesen: Rhodophyceæ of the Danish W. Indies. 



189 



As a rule it is opposite, but some- 

 times 3 — 5 or more verticillated bran- 

 ches are found (Fig. 175, 176). These 

 branches are generally, of a very- 

 different strength, some being vigo- 

 rous, others dehcate. Now and then 

 too, a single branchlet is issued from 

 each joint or they are quite destitute 

 of branches. And what especially 

 contributes to make the ramification 

 irregular are the many adventitious 

 branches (Fig. 177). These often grow 

 out below the ordinary branches, but 

 they may also issue almost every- 

 where from the joint e. g., as shown 

 in Fig. 177, from the middle of the 

 joint. Some of the branches, the 

 most vigorous, grow out to main 

 filaments like the mother-branch, but 

 most of them become short branch- 

 lets only. These branchlets are un- 

 divided, or they may bear a single 

 or a few opposite branches. The branchlets taper evenly upwards 

 to their apex. At their base the branchlets are about 100 « thick, 



at their upper end 

 they often scarcely 

 reach 35/i in diameter. 

 In the main filaments 

 the joints are about 

 180« thick, somewhat 

 thicker in their upper 

 end, thinner in the 

 lower one ; their length 

 reaching 600^« or more. 

 Once in a specimen 

 I found a few of 

 the branchlets ending 

 in small attachment 



discs (Fig. 178). 



Fig. 177. Corallina cuhensis (Mont.) Kiitz. Joints 'Y\\q base of the 

 with adventitious branches. Drawn from a decal- 

 cified specimen. (About 18:1). plant consists of pro- 



Fig. 176. Corallina cubensis 

 (Mont.) Kiitz. Summit of a 

 slender plant. (About 18: 1). 



