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



235 



place with rather long ramuli, and Fig. 224 another specimen 

 from an open place with short, robust ramuli. 



Farlow points out 

 (in "The Marine Algæ of 

 New England", p. 140) 

 that : "The individuals 

 which bear the cystocarps 

 are distinct from those 

 which bear the antheridia. 

 and may be recognized by 

 their more dense habit". 

 The single cystocarpic 

 specimen I have come 

 across was very like the 

 one figured in (Fig. 222). 

 Fig. 225 shows a bilobed 

 cystocarp ; in the halfpart 

 to the left the arrange- 

 ment of the carpospores Fig. 226^ .S;>^rfV/m /?iame«<osa (Wulf.) Harv. 



^ .^ A cystocarp. (About 100:1). 



is seen. Fig. 226 is the 



reproduction of a transverse section of a young cystocarp. An- 

 theridial plants were not found. 



Some of the specimens had tetrasporangia. These occured at 

 the base of the ramuli, one to three growing out from each bark-ring. 



This species is very common along the shores of 

 the islands. 



Geogr. D ist rib.: West Indies, warmer parts of 

 the Atlantic Ocean, Mediterranean Sea, Red Sea, 

 Indian Ocean. 



2. Spyridia clavata Kiitz. 



KüTZiNG, F., in Linnæa, vol. XV, 1841, p. 744; 

 Spec. Alg. p 667; Tabulæ phycologicæ, vol. XII, 

 tab. 45, figs, c, d. J. Agardh, Species Algarum vol. 

 II, p. 344; Epicrisis, p. 271. 



This plant (Fig. 227) is originally described 

 from a specimen from St. Thomas which 

 KüTziNG received from Senator Binder. The 

 description below is based upon specimens 

 collected by me, not only at St. Thomas, but 

 also at St. Croix. 

 The thallus is terete. The ramification is distichous, both the 

 branchlets and the ramuli issuing seriate from both sides of the frond. 



Fig. 226. Spyridia 

 filamentosa (Wulf.) 

 Harv. Transverse 

 section of a young 

 cystocarp. (About 

 100 : 1). 



