356 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



out at the base of the pinnate side-branches. A single almost ripe 

 cystocarp was found (3511?); it was nearly spherical, placed term- 

 inally upon a short, thick branch. My plants were gathered in 

 March; M"® Vickers has had plants with cystocarps from Bar- 

 badoes collected in July. 



Antheridial stands have been described by Askenasy, I.e.; 

 according to him the antheridia cover more or less completely the 

 summit of short clavate branchlets. 



This plant has been dredged a few times in deep water only, at 

 a depth of about 12 fathoms. It was growing in a place where strong 

 currents prevail and was gathered with young cystocarps in the 

 month of March. 



St. Jan: In the sound between this island and St. Thomas off 

 Cruz Bay. 



Geogr. Distrib.: West Indies, Canary Isles, Mediterranean Sea, Pa- 

 cific Ocean. 



IV. Gigartinales. 



Fam. 1. Gigartinacece, 



Subfam. 1. Gigartineæ. 



Gigartina Stackh. 



1. Gigartina acicularis (Wulf.) Lamour. 



Lamouroux, Essai des Thalassiophytes, 1813, p. 48. Agardh, J., Spec. 

 Alg., vol. II, p. 263; Epicr., p. 190. Kützing, Spec. Alg., p. 749; Tab. Phycol., 

 vol. 18, tab. 1. Harvey, W. H., Phycol. Brit., tab. 104. 



Fucus acicularis Wulf., Cryptogama aquatica, p. 63, No. 50. Turner, 

 Fuci, tab. 126. 



For more synonyms compare De-Toni, Sylloge Alg., vol. IV, sect. I, 

 p. 198. 



This species has only been gathered once in shallow water and 

 in a sheltered place. The few specimens found were sterile. 



St. Croix: The harbour of Christianssted. 



Geogr. Distrib.: Seems to occur in all warmer seas. 



