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



On the shores of the islands this plant was found as an epi- 

 phyte upon Laurencia obtusa upon the fronds of which it creeps. 

 It was found in very exposed places in the littoral region. 



St. Croix: Hams Bluff, Northside. St. Thomas: Upon the reef 

 connecting this island with the Hurricane Island. St. Jan: Cruz Bay. 

 Geogr. Distrib.: Bermuda, Mediterranean Sea. 



4. Ccramium nitens (Ag.) J. Agardh. 



J. Agardh, Spec. Alg., vol. II, p. 130; Epicrisis, p. 101. 

 Ceramium rubrum var. nitens C. Agardh, Systema, p. 136. 



Ceramium nitens has been found in shallow water and in 

 the sea down to a depth of about 10 meters and in quite shel- 

 tered spots as well as in more exposed places. 



It is often found upon the roots of the mangroves, upon 

 which it forms rather large tufts, up to 10 cms. or higher. These 

 are fastened to the mangrove roots by means of rhizoids issuing 

 from the lower parts of the filaments. These rhizoids are mostly 

 found together in small tufts. They are rather short and built up 

 of a stalk, composed of some few fairly thickwalled cells, and 

 a small irregularly lobed disc. 



Specimens with tetrasporangia only are met with. These oc- 

 curred in the months of January to March. 



This species is rather common on the shores of the islands. At St. 

 Croix it has already been collected by Rav.\, Ørsted and others. 

 Geogr. Distrib.: West Indies. 



Fam. 2. Rhodonielacece. 



Subfam. 1. Laurencieæ. 



Laurencia Lamouroux. 



The correct definition of the species belonging to this genus 

 according to the material to hand has given me much trouble, 

 and I am afraid that I have not always arrived at a definite 

 result. In order to arrive at an exact definition a comparison with 

 authentic specimens would be necessary, but at present, during the 

 war, this is out of the question. The examination of the original 

 specimens and a revision of the whole genus seems to be very 

 desirable. 



