20 



Dansk Botanisk Arkiv, Bd. 2. Nr. 2. 



The erect filaments are here more branched, thicker, with 

 shorter cells and bear the sporangia on short side-branches some- 

 what over their base (comp. Heydrich's figure, pi. XXV, fig. 14), 

 now and then sporangia are also found higher up upon the fila- 

 ments. The sporangia are somewhat thinner (15 — 20//) and 

 judging from the figure of Heydrich they also seem to be shorter. 



St. Thomas: French Wharf. 



Geogr. Distrib. New Guinea, Gulf of Aden. 



Fa m. 2. Encoeliaceæ. 

 Colpomenia Derb, et Sol. 



1. Colpomenia sinuosa (Roth) Derb, et Sol. 



Derbes, A., and A. J. J. Solier, Memoire sur quelques points de la 

 Physiologie des Algues, p. 11 (here called sinuata but in the description of 

 the figures (p. 119) and at the plate 22 we find sinuosa). 



Ulva sinuosa Roth, Catalecta Botanica, III, p. 327, tab. XII, fig. a. 



Asperococcus sinuosus Bory, Expedition scientifique du Morée, t. Ill, 

 p. 326 (non vidi). Nouvelle Flore du Péloponnése et des Cyclades, 1838, p. 76. 

 J. Agardh, Spec. Alg., I, p. 75. 



Encoelium sinuosum Ag., Spec. Alg., I, p. 146; Systema p. 262. Kit- 

 zing, Spec. Alg., p. 552; Tab. Phycol., vol. IX, pi. 8. 



Fig. 12. Colpomenia sinuosa (Roth) Derb, et Sol. 



Transverse section of the thallus showing plurilocular sporangia together 



with paraphyses surrounding a group of hairs. (About 90 : 1). 



Fructifying specimens with ripe plurilocular sporangia were 

 collected in the area of the sea with shallow water behind Long 

 Reef at Christianssted. As described by Mitchell in Murray 

 „Phycological Memoirs", Part II, p. 53 the plurilocular sporangia 

 occur in dense groups scattered over the whole surface of the 

 thallus being formed round the depressed groups of hairs. 



