THE AERIAL ALGÆ OF ICELAND 343 



(Desmidiaceæ, Diatoma hiemale, Dialomella Balfouriana, Epithemia 

 Argus, E. turgida, Frustulia rhomboides, F. r. v. saxonica , Gomphonema 

 subclavatum, G. parvulum, Hantzschia amphioxys, Meridion circulare, 

 Melosira italica v. tenuissima, Navicula cincta, Pinnularia borealis, P. vi- 

 ridis V. commutata, Surirella ovalis, Synedra Ulna v. typica, S. U.v. danica, 

 Tabellaria flocculosa (det. E. Østrup)). 



330. vSmall boiling spring at Sturlureykir; temp. of water 76 '^ C; 

 on silicious sinter not wetted by the water ^/s. 



(Calothrix thermalis). 



331. At same boiling spring, on Sphagnum on bank of outlet ^/s. 

 (Desmidiaceæ). 



333. On bank of outlet from Deildartungahver; not directly wetted 

 by the water; temp. of the water 66*^ C. ^/s. 



(Stigonema panniforme). 



334. Squeezed out of Sphagnum cushions at Deildartungahver; temp. 

 of cushions 17° C. ^/s. 



(Desmidiaceæ, Diatomella Balfouriana, Epithemia Argus, E. turgida, 

 Eunotia prærupta f. curta, Frustulia rhomboides, Hantzschia amphioxys. 

 Meridion circulare, Nitzschia Denticula, Pinnularia appendiculata, P. bo- 

 realis, Rhopalodia rupestris (det. E. Østrup)^. 



335 Betula in the wood near Nor(Munga ^^/s. 

 (Trentepohlia? in the imperfect thallus of a lichcn). 



336. Road near Helgavatn ^^s. 



(Botrydiopsis arhiza. Achnanthes marginulata. Galoneis fasciata, 

 C. Vaucheriæ, Gymbella Cistula, Diatomella Balfouriana, Eunotia præ- 

 rupta f. curta, Fragilaria lævissima, F.virescens, Gomphonema angustatum. 

 Navicula Atomus, N. brekkaensis, Pinnularia appendiculata v. irrorata, 

 P. borealis, P. gracillima, P. molaris, Rhopalodia gibba, R. gibberula). 



337. Beside a hot spring at Helgavatn ^^Is. 



(Symploca muscorum. Galoneis fasciata, Navicula contenta, Nitzschia 

 amphibia, N. communis v. abbreviata, N. microcephala, Rhopalodia gib- 

 berula). 



338. Soil from potato field near the hot springs at Helgavatn ^"/s. 



(Botrydiopsis arhiza, Vaucheria hamata, Galoneis Vaucheriæ, Dia- 

 tomella Balfouriana, Epithemia Argus, Fragilaria virescens, Navicula Iherini- 

 cola, Nitzschia Denticula, Pinnularia appendiculata, P. borealis, P. inter- 

 rupta f. minor, P. molaris, P. subcapitata, P. viridis v. rupestris). 



343. Vaucheria carpets on mud on bank of brook bed near Borg ^Vs- 

 Fig. 1, p. 357. 



(Vaucheria sphærospora. Diatomeæ). 



344. On mud in naked depression in littoral meadow at Borg; 

 frequently flooded with salt water ^^/s. 



(Vaucheria sphærospora, Percursaria percursa, Diatomeæ). 



349. At base of telegraph pole near Borgarnes ^Vs- 

 (Chlorella rugosa, Stichococcus bacillaris). 



23* 



