F. Børgesen: Rhodophyceæ of the Danish W. Indies. 341 



cells are divided in a similar way giving origin to the two long hair- 

 like filaments crowning the branchlets (Fig. 3376). At the base of 

 the hairs short segments are cut off; these grow longer upwards, 

 become hair-like without chromatophores, the uppermost ends of the 

 hairs dying away gradually. It cannot be denied that these terminally 

 placed hairs bear a close resemblance to those of the Phæosporaceæ 

 having a very similar intercalary division. The growing point lies 

 a little above the bifurcation, the segments being shortest here and 

 always filled densely with protoplasma etc. 



My specimens are all sterile. The stichidia are beautifully figured 

 by Thuret, 1. c. The sporangia are formed in two rows in the flat 

 branchlets in the remaining part of the two pericentral cells from 

 which the two border-cells are cut off. 



The cystocarps are unknown. Collins and Hervey*) mention 

 that they have found a mature cystocarp, but it was lost before 

 notes and figures could be made. 



The plant was found in an open place upon reefs of calcareous 

 algæ etc. with shallow water or nearly laid dry. 



St. Jan: Cruz Bay. 



Geogr. Distrib.: Pacific Ocean, West Indies, Cape, Morocco, Mediter- 

 ranean Sea, Tongatabou. Seems to be widely spread in warmer seas. 



Caloglossa J. Ag. 



1. Caloglossa Leprieurii (Mont.) J. Ag. 



Agardh, J., Epicrisis, p. 499. Cramer, C, Über Caloglossa Lepri- 

 eurii (Mont., Harv.) J. Ag. in Festschrift f. Nägeli u. Kölliker, Zürich 1891. 



Delesseria Leprieurii Mont. Seconde Centurie de plantes cell, exotiq. 

 nouvelles in Ann. Sc. Nat., Bet., II. sér., t. 13, p. 196, pi. 5, fig. 1. J. 

 Agardh, Spec. Alg., vol.11, p. 682. Harvey, W.H., Nereis Bor.-Am., Part 

 II, p. 98, pi. XXII. C. 



Hypoglossum Leprieurii Kiitz., Spec. Alg., p. 875; Tab. phycolog., vol. 

 XVI, tab. 10. Nägeli, C, Wachsthumsgeschichte von Hypoglossum Lepri- 

 eurii (Mont.) Kg. in Nägeli und C. Cramer, Pflanzenphys. Untersuch., 1. 

 Heft. 1855, p. 69, tab. VIII. 



This specieshas been examinedseveraltimes, especially by Nägeli 

 andGRAMER,towhosebeautifully illustrated examinations I here refer. 



Caloglossa Leprieurii (Fig. 338) is one of the algæ commonly 

 occurring on the roots of the mangroves, upon which it often forms 



*) Collins, F. S. and A. Hervey, Algæ of Bermuda, p. 117. 



