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



a somewhat more robust plant than the aforementioned one. 

 It seems to show much hkeness in shape and size to Yendo's 

 species. 



In the specimens found the diameter of the joints varies from 

 110;/ to 175;/, their length being 3 — 5 times as long. The whole 

 plant is rather straight and stiff. 



The joints in the filaments are cylindrical, except the upper- 

 most ones in the ends of the filaments which taper much upwards, 

 ending in acute pointed summits. 



The specimens found are all sterile. I wish to point out that 

 they show much likeness to the habit-figure of Kützing's Jania 

 tenella in Tabulæ Phycologicæ, vol. VIII, pi. 85 (fig. /), but this 

 species is smaller; in De-Toni's Sylloge the filaments are said 

 to be 100;/ broad. 



The plant was collected in rather deep water, about 10 fathoms. 



St. Jan: off America Hill and in the sound between St. Jan and 

 St. Thomas off Cruz Bay. g 



Geogr. Distrib. : Japan. 



4. Jania capillacea Harv. 



Harvey, W. H., Nereis Boreali-Americana, Part II, 1853, p. 84. 



In the Herbarium of the Botanical Museum is found an old 

 specimen of a Jania which I think can be considered as a form 

 of Harvey's plant. 



Harvey's short diagnosis runs verbally: "minute, dichoto- 

 mous, capillary, with wide axils; branches recurved, squarrose; 

 articulations cylindrical, four to six times as long as broad". 



The plant in question (Fig. 188) agrees very well with this 

 diagnosis with the exception that the joints are somewhat shorter 

 in proportion to their breadth, these being about 150;/ long and 

 350—400;« broad. 



A plant very similar to that from St. Croix has been distri- 

 buted in Phycotheca Bor. Am., Nr. 150, originating from Jamaica. 

 This plant, too, has comparatively short joints. On the other 

 hand I have seen a small specimen belonging to the Riksmuseum, 

 Stockholm, which seems better to agree with the diagnosis of 

 Harvey. It was collected at Key West and determined by 

 Farlow. The filaments in this plant are about 110« thick, the 

 length of the joints about 5 times as long, but this plant approach- 

 es considerably to some of the forms I have referred to Jania 

 adhaerens. 



