— 201 — 



(Fig. 17 E), in accordance with the description of Falkenberg. In the 

 same way the ramification, the development of the side-branches 

 from a pericentral cell (Fig. 17 B), agrees with the description of 

 Falkenberg, 



In the pericentral cells a large nucleus is present; in each set 

 of pericentral cells the nuclei lie in the same plane and quite close 

 to the wall towards the small central cell (Fig. 17 D, E). The 

 length of the cells varies between 40 and 70 ^. Any kind of repro- 

 ductive organs has not yet been found in this species and my 

 plants were also quite sterile. 



This species occurred, as mentioned above, epiphytic on diffe- 

 rent algae, e. g. Gelidium rigidum, and Chamcedoris annulata. It 

 was growing in shallow water, 1 — 4 feet, in a rather open locality. 



Hitherto only found on the southern coast of St. Croix: at 

 White Bay. 



Acanthopliora spicifera (Vahl) nob. 



Fucus spiciferus Vahl, "Endeel kryptogamiske Planter fra St. 

 Croix" (Skrivter af Naturhistorie-Selskabet, S^^Bind, 2^^^^ Hefte, Kieben- 

 havn 1802); Esper, "Icones Fucorum", l^''^ Heft, Niirnberg 1808, pag. 

 108, tab. CLIX. Fucus acanthophorus Lamouroux, "Dissertation sur 

 quelques especes de Fucus", Agen, An XIII = 1805, p. 61, tab. XXX et 

 XXXI fig. 1, Acanthopliora Thierii Lamouroux, "Essai sur les gen- 

 res de la famille des Thalassiophytes non articulees", Paris 1813, 

 p. 44. Harvey "Nereis Boreali-Americana", Part. II, p. 17 pi. 

 XIV, A. J. Agardh, "Spec. gen. et ordines Algarum", vol. II, 

 p. 3, Lund 1803, p. 819, Chondria acanthophora C. Agardh, "Spe- 

 cies Algarum", Gryphiswaldise 1821, p. 363; "Systema Algarum", 

 Lundse 1824, p. 209. 



As will be clear from the above, I believe that we are obliged 

 to change Lamouroux's name for this plant to that of Martin 

 Vahl. Vahl is the first who has a description of this plant, 

 founded upon specimens collected at St. Croix by West who sent 

 them to Vahl for determination. In Vahl's Herbarium now in 

 the Botanical Museum, Copenhagen, a well preserved and typical 

 tetrasporic specimen is to be found. On the label Vahl has writ- 

 ten besides the name: "F. ex Ins. S. Cr. West" and it is con- 

 sequently to be regarded as the original specimen. 



Further the above-cited figure by Esper of this plant is 

 partly based upon a specimen from Vahl's collection; this is 



