941 



Sparganium affine. Some fragments of Callltriche autumnalis were 

 found driven ashore. 



5. Miavevatn and Leinumvatn, Stromo. Margins nearly 

 everywhere stony and gravelly. In piaces Heleocharis association con- 

 sisling of Heleocharis paluslris and Ranunculus flamniula. — Outside 

 of this the Litorella association: Litorella, Isoétes cchinosporum and I. 

 lacustre, Subularia, Nitella opaca, Callitriche hamulala and Myriophyllum; 

 the last on the transition-belt to the Sparganium-Potamogeton association 

 ofwhich onlj^ Sparganium affine was observed. 



6. Small lakes above Næs parsonage on Ostero, about 

 100 M. above the sea. Litorella association: Litorella, Isoétes lacustre and 

 I. cchinosporum, Juncus supinus, Subularia, Ranunculus flammula. — 

 Sparganium-Potamogeton association: Sparganium, Potamogeton gramineus 

 (sparingly), and Myriophyllum from a depth of about 50 Cms. 



7. Toftevatn on Ostero; a large lake. No vegetation on the 

 stony and gravelly margin. Some distance out in the water, Litorella 

 association with Litorella, bolh Isoétes-species and Subularia. — Spar- 

 ganium-Potamogeton association very scanty, with Potam. gramineus, P. 

 perfoliatus and Myriophyllum. 



8. The larger lake at Ej de, Ostero. Beyond the ordinary 

 Litorella association there is in the inlets a dense growth of Sparganium 

 and Potamogeton natans; further out, submerged Potamogetons (P. al- 

 pinus, P. perfoliatus and P. pusillus). 



The smaller lake is entirely covered with P. natans and a little 

 Myriophyllum. 



9. Sorvaagsvatn on Vaago, the largest Færoese lake. At the 

 time of my visit, the surface-level was so high that the few small piants 

 (Montia and Sagina procumbens) of the gravelly margin were entirely 

 under water (amphibious association). Beyond were patches of Litorella 

 with Isoétes mixed between, but I saw no other vegetation. 



10. Sandsvatn on Sand 6. This is just as barren as the other 

 larger lakes, Toftevatn and Sorvaagsvatn. The gravelly strand is over- 

 run with Sagina procumbens, Montia, Juncus lampocarpus and Ranun- 

 culus reptans (partly submerged) and some casuals, such as Poa an- 

 nua, Juncus bufonius and Koenigia (amphibious association). In the water 

 Litorella was seen, and further out Potamogeton perfoliatus with a 

 little P. gramineus. 



11. Grothusvatn (»Saltvigsvatn«) on Sando. The greater part 

 of the margin is rocky, but towards the west is also gravelly. The 

 lake is very shallow with a depth of 50—100 Cms., and is entirely 

 covered by Sparganium-Potamogeton association: Potamogeton perfoliatus, 

 P. nitens and P. gramineus dominating, with Sparganium, a little Litorella, 

 Juncus supinus (submerged), Isoétes, and in piaces Potamogeton pusillus 

 forming low, dense tufts, which make no attempt to reach the surface. 



Small pools near Grothusvatn have a luxuriant vegetation of Litor- 

 ella, Lobelia, Juncus supinus, Sparganium, Potamogeton nalans and 

 P. polygonifolius, amongst which Menyanthes and Heleocharis make 

 their appearance. 



12. A small lake in Skopen Bygd, Sando. Gravelly border, 

 with muddy bottom. A rich algal vegetation occurs on Myriophyllum 



