50 



statement, as all other Cladophoraceœ have many nuclei in each 

 cell. Later on, Wille has shown, that some species belonging 

 to the subgenus Isochrous Kjellm. only contain one nucleus in 

 each cell, and I too only found one nucleus in each cell in 

 Spongoinorpha vernalis (Kjellm.) and Spo7igomorpha sp. from 

 Iceland (Icel. Alg. p. 366). 



The Greenlandic species are about 1,5 — 2 cm. high, about 

 30 fx thick below, and about 40 — 50 p. thick above. Hooked 

 and incurved branches occur. The specimens fully agree with 

 the description and figures (1. c. Tab. V) given by Kjellman, 

 and the only difference is, that the Greenlandic plants are 

 somewhat thicker than the plants described by Kjellman. 

 The specimens are sterile, and were collected in July in a 

 littoral pool, 15 — 20 feet above the level of the sea. 



Gr. o CO.: The rock Nunanguak west of Umanak 60° 34' (A. 

 Jessen). 



Geogr. distribution : Iceland, Kattegat. 



Cladophora (Kfitz.). 



85. C. gracilis (GriflF.) Kiitz., K. Rosenv. Grl. Havalg. p. 910. 

 The specimens from East Greenland entirely agree with 



the West Greenlandic plants referred by Rosenvinge to this 

 species. The plants occurred in company with Chœtomorpha 

 tortuosa^ StictysipJion tortilis a. o. The species was collected 

 in September and had some few sporangia. 

 Gr. or.: Tasiusak. 



Rhizocloniiim Kiilz. 



86. Rh. ripariuin (Roth) Harv., K. Rosenv. Grl. Havalg. p. 9 1 3, 

 Deux. Mém. p. 103. 



a. polyrhizum K. Rosenv. Grl. Havalg. 1. c. 



The filaments are 17 — 29 (i thick, in other respects the 

 specimens entirely agree with the description. It was collected 

 in September. 



