— 132 — 



belong to the Rhodophyceæ, but to the Ghlorophyceæ, and he mentions 

 it as a variety of Ostreobium Queketti Born, et Flah., var. rosea Nadson. 

 He says that these two plants chiefly differ in the colour of the frond. 

 As Gonchocelis rosea is composed of articulated filaments without 

 anastomoses, I cannot admit that Mr. Nadson is right in identifying ft 

 with Ostreobium Queketti. The Gonchocelis rosea is still unsufficiently 

 known, but I do not think that it will prove to be a Ghlorophycea on 

 further investigation. 



E. I cel. Reyöarfjöröur. 

 N. Icel. Eyjafjöröur. 



NW. Icel. Hrütafjöröur, Isafjöröur; Dvrafjöröur (C.O.); Arnarfjöröur. 

 SW. Icel. Stykkishölmur, Reykjavik. 

 S. Icel. Vestmannaeyjar. 



Florideæ. 

 Fam. Helminthocladiaceæ. 



Chantransia virgatula (Harv.) Thür., Rosenv. Grl. Havalg. p. 824. 



On Gorallina, Callithanmion Arbuscula, Halosaccion and other algæ. 



Collected with monospores in April— June. From a pericellular, 

 membranaceous base, one cell thick, rise one to three or more vertical 

 filaments. The cells in the middle of the filament are three times longer 

 than those near the base, 10 — 11 ji thick. 



NW. Icel. Isafjöröur (G. O.). 



SW. Icel. Hvammsfjöröur, Reykjavik; Njarövfk (G. O.). 



Chantransia secundata (Lyngb.) Thür., Rosenv. Grl. Havalg. p. 824. 



On Sertularia and varions algæ e. g. Gorallina, Rhodochorton Rothii a. o. 



Collected with monospores in May — June and September. 



The vertical filaments are 10 — 13 (i thick. This species cannot be 

 distinguished from the last named by the thickness of the filaments, 

 since both species have nearly the same thickness. The basal disk is as 

 in G. virgatula, from which species it differs by its much shorter cells 

 (cfr. also Rosenv. Grl. Havalg.) and more secund branches. 



E. Icel. Hölmanes (G. 0.). 



SW. Icel. Reykjavik, Hafnarfjöröur ; Njarövi'k (G. O.). 

 S. Icel. Vestmannaeyjar. 



Chantransia Alariæ H. Jonsson n. sp. 



Planta 0.5— 1 mm. alta, villo denso, lanuginoso laminam Alariæ 

 esculentæ investiens, filis erectis 1—2, pulchre roseis, e cellula 



