382 



This is a common species along the shores of the islands. 

 It occurs in shallow water and mostly in more sheltered places, 



but it is also found in somewhat 

 exposed localities. 



In the last mentioned places 

 where the light, too, was strong 

 some specimens were gathered which 

 were covered quite densely with 

 long, unicellular, hyaline hairs. 

 These hairs serve most probably as 

 a protection against strong light*) 

 being present in so many littoral 

 algae and non existing or less deve- 

 loped in those from deep water. 

 That the hairs, on the other hand, 

 also may serve as absorbing organs 

 of nutriments, is very likely**). 



Hypnea musciformis is often an 

 epiphyte upon larger algse and 

 occurs commonly entangled among 

 other algse to which it fixes itself 

 by means of the tendrils. 



Specimens with tetrasporangia 

 were found in the month of February. 



St. Croix: Christianssted's harbour, 

 Christianssted's Lagoon, Lt. Princess, 

 White Bay, Casavagarden etc. St. Tho- 

 mas: Store Nordsidebugt. St. Jan: Coral 

 Fig. 367. Hypnea cornuta Bay, Cruz Bay. 



(Lamour.) J. Ag. Geogr. Distrib. : Seems to occur 



Part of a plant. (About 3:1). in all warmer seas> 



2. Hypnea cornuta (Lamour.) J. Ag. 



J. AGARDH, Spec. Alg., vol. II, p. 449; Epicr. p. 563. 



Gigartina cornuta Lamour. mscr. 



Chondroclonium cornutum Ktitz., Spec. Alg., p. 741. 



*) Vide BERTHOLD, G., Beitrage zur Morphologie und Physiologie der 

 Meeresalgen. Pringsh. Jahrb. f. wiss. Bot., Bd. 13, 1882 p. 675. 



"*) ROSENVINGE, L. KOLDERUP: Remarks on the hyaline unicellular hairs 

 of the Floridese (Biol. Arbejder tilegnede BUG. WARMING, K0benhavn 1911). 



