— 2 — 



Rosenvinge has found in the Danish species belonging to this 

 group of Chantransia ^). 



The basal cell bears as a rule two filaments, rarely only one, 

 which gradually taper towards their apex, the basal cell being the 

 thickest of all. Hairs occur rather seldom and not on every plant; 

 where they are present they are always to be found at the tips 

 of the filaments (Fig. 1 B). I have never seen hairs pushed aside 

 by a cell developed in continuation of the mother-filament, as is 

 commonly to be found in the Chantratisia-spec'ies. 



As to the chromatophore I cannot say anything with certainty;. 

 in my material preserved in alcohol the contents of the cell have 

 more often a quite homogeneous appearance of a bluish-green 

 colour. Nevertheless it has happened to me a few times to find 

 specimens where the chromatophore was a little more distinct, just 

 as it is also more conspicuous when prepared in glycerine and 

 from this it seems to me most probable that the chromatophore 

 is stellate with a central pyrenoid. 



Ch. cnissipes seems to be rather closely related to Ch. 

 minutissima Reinsch (Gontrib. Alg. et Fung., p. 33, Tab. V., 

 Fig. 2 and Tab. XI, Fig. 3, here called Ch. minima) but among 

 other characters Reinsch's plant is different by having thinner 

 and longer cells especially at the end of the filaments. Of the 

 species Rosenvinge mentions as belonging to this group my 

 species seems to come nearest to Ch. moniliformis but is easily 

 distinguished by various characters. 



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

 troceras and Hijpnea in small quantities. It has been found 

 with monosporangia in January and was growing in shallow water 

 in the lagoon at the head of the eastern bay in the harbour of 

 St. Thomas. 



Chantransia Hypneae nov. spec. 



Thallus caespitulosus partim e fills erectis partim ex endophyticis 

 constructus. Fila endophytica, intercellularia, ramosa, interdum hori- 

 zontalia inter cellulas superficiei hospitis repentia e quibus rami 

 verticales in contextum cellulosum hospitis emittuntur. 



Fila erecta e basi ramosa, ramis sparsis, paucis. Gellulae cylin- 

 dricse, 7—10// latse, inferiores binas vel trinas, superiores trinas vel 



*) Rosenvinge, L. Kolderup, The marine algae of Denmark, Parti 

 (1909), p. 88. 



