List of Freshwater Algæ. 85 



Staurastrum Meyen. 



1. S. aculeatum (Ehrenb.) Menegh. , Desmidiuni aculeatum 

 Ehrenb., Infus, p. 142, tab. 10, fig. 12. Ralfs, Brit. Desm., p. 142, 

 tab. XXIII, fig. 2. 



ß ornatum Nordst., Desm. Spetsb. p. 40, tab. VII, fig. 27. 

 forma spinossisima Wille., Ferskvandsalg. Nov. Semlja, p. 54, 

 tab. XIII, fig. 67 -68. 



Børgesen, Ferskvandsalg. Østgrønland, p. 28 (Hekla Havn). 



Larsen, Freshw. Alg. East Greenl., p. 95 (Kap Dalton, Liverpool Kyst in Hurr}' Inlet). 



Some few specimens of this variable species, coming near to the 

 above-mentioned form of Wille, were found in several collections 

 from Vester Elv. 



Long. = 37/^; lat. = 40//. 



Loc. Danmarks Havn. 



2. S. avicula Bréb. forma Boldt, Desm. Grønl. p. 37. Staur. 

 denticulatum (Näg.) Archer forma Elfv. Anteckn. finska desm. p. 9, 

 tab. 1, fig. 5. 



A single specimen was found in a collection from Vester Elv. 



Long. 29 /i; lat. sin. acul. = 35//. 



It was not earlier found in East Greenland but the species is 

 known from Godthaab (Larsen, I. c, p. 347) and Friedrichsthal (Boldt, 

 1. c, p. 37) in West Greenland. 



Loc. Danmarks Havn. 



o. S. Brebissonii Archer in Pritch. Infus, p. 739. 

 forma minor Nordst., Desm. Grønl. p. 10. 



Larsen, Freshw. Alg. East Greenl. p. 96 (Kordlortok, Amaka, Kap Dalton, Liver- 

 pool Kyst in Hurry Inlet, Jameson Land). 



Found in several collections from Vester Elv. 

 Long. = 40-50/7.; lat. 35 -40/i. 

 Loc. Danmarks Havn. 



4. S. hexaceros (Ehrenb.) Wittr., Gotl. Ö1. sötv. Alg., p. 151. 

 forma alternans Wille, Ferskvandsalg. Nov. Semlja, p. 52, tab. 

 XIII, fig. 63. 



Borgesen. Ferskvandsalg. Østgrønland, p. 27 (Hekla Havn). 

 Larsen, Freshw. Alg. East Greenl.. p. 97 (Jameson Land). 



The form observed was a little larger than that mentioned by 

 WiLLE (1. c). 



Long. = 31 a. 



Found in a collection from Vester Elv. 

 Loc. Danmarks Havn. 

 XLHL 7 



