F. Borgesen: Rhodophyceæ of the Danish W. Indies. 381 



Plants with tetraspores were found in the month of February. 

 It has been gathered in shallow water near the shore in rather 

 exposed places. 



St. Croix: White Bay, Long Reef, Lt. Princess. 

 Geogr. Distrib. : West Indies. 



10. Gracilaria cervicornis (Turner) J. Ag. 



Agardh, J., Spec. Alg., vol. II, p. 604; Epicr., p. 425. 



Fucus cervicornis Turner, Fuci, pi. 121. 



For more synonyms comp. De-Toni, Syiloge, vol. IV, Sect. II, p. 452. 



I have not myself gathered this species at the islands, but 

 according to J. Agardh it has previously been found at St. Croix. 

 And some old specimens from St. Croix are kept in the Herba- 

 rium of the Botanical Museum, Copenhagen. Some of these are 

 most probably collected by Rector West and sent to Vahl; but 

 being without his signature, this question cannot be settled. 



It seems to me that the description of Fucus versicolor given 

 by Vahl in the year 1802 in „Skrivter fra Naturh.-Selskabet", 

 vol. 5, part 2, p. 44 on the whole answers to this species, but when 

 the „dentibus" are said to be "obtusissimis" it does not correspond 

 with this plant. 



Geogr. Distrib.: West Indies, Mexico, Brazil. 



Subfam. 3. Hypneeæ. 



Hypnea Lamouroux. 



Collins and Hervey point out in the "Algæ of Bermuda", 

 p. 112 — 13 that the species of Hypnea are generally so poorly 

 defined that any exact determination is mostly excluded. 



The representatives of the genus Hypnea seem to be very 

 variable plants, varying much according to their different growing 

 places. Several of the species described are most probably nothing 

 else but forms of the same plant. 



1. Hypnea musciformis (Wulf.) Lamour. 



Lamouroux, Essai Thalassioph., p. 43. Kützing, Fr., Spec. Alg., p. 

 758; Tab. Phycol., vol. 18, tab. 19. J. Agardh, Spec. Alg., vol. II, p. 442; 

 Epicr., p. 561. 



Fucus musciformis Wulf, in Jacquin, Collectanea, III, p. 154, tab. 14, 

 fig. 3 (non vidi). Esper, Icones Fuc, tab. 93. Turner, Fuci, tab. 127. 



For more synonyms compare De-Toni, Sylloge Alg., vol. IV. Sect. II, 

 p. 472. 



