THE AÉRIAL ALGÆ OF ICELAND 337 



140. A layer of algae in an almost dr}' spot in n ditch by the 

 roadside south of Akureyri ^^ji. 



(Desmidiaceae, Zygnema sp., Aclinantlies linearis, Caloneis fasciata, 

 C. Silicula, Cymbella æ(iualis, C. ventricosa, Diploneis ovalis v. oblongella, 

 Eunolia paludosa, E. pectinalis, Goniphonema parvulum, Navicula cincta 

 V. Heiiflcri, N. mutica f. Cohnii. Nitzschia anipbibia, Pinnularia borealis, 

 P. gracillima, P. stauroptera v. intcrrupta, P. viridis, liliopalodia ventricosa, 

 Stauroneis anceps). 



153. On rocks splashed with waler from a calaract nortb of 

 Akureyri ^-/t. 



(Nostoc commune). 



155. Sbedding cpidermis of Betula odorata in the wood at Hals ^^/t. 

 (No algæ). 



156. Sbedding bark of Betula in Ihc wood af Hals ^Vt. 

 (Young tballi of a lichen). 



157. On the lower portion of the stem of a Betula; Hals ^*/7. 

 (No algæ). 



158. From the stem of a large Betula in the wood at Hals; abt. 

 1 m. above the ground '^/7. 



(No algæ). 



159. On the stem of the same tree quite near the ground ^^/t. 

 (Some indeterminable round cells of a Chlorophycea.. 



160. Almost naked earth from the wood at Hj'ds ^^7. 

 i^Achnanthes marginulata, Eunotia prærupta f. curta, Hantzschia 



amphioxys, Navicula contenta, N. mutica f. Cohnii, P. borealis, P. inter- 

 media, P. subcapitata v. sublanceolata). 



161. Hals parsonage; »hlat)« ^^j-,. 



(Fragilaria mutabilis, Meridion circulare, Navicula nilrophila, Pinnu- 

 laria borealis). 



162. Hals parsonage; on turf near the stonc fence in front of the 

 house ^Vt. 



(Prasiola crispa, Achnanthes lanceolata, Diatomella Balfouriana, 

 Epithemia Zebra, Goniphonema angustatum, Hantzschia amphioxys. Navi- 

 cula Atomus, N. contenta, N. mutica f. Cohnii, A^ nilrophila, Nitzschia 

 amphibia v. aculiuscula, Pinnularia borealis, P. intermedia). 



169. Damp ground on the bank of a pond near Ljosavatn ^^/t. 



(Achnanthes marginulata, Caloneis fasciata, C. Silicula v. minuta, 

 Cocconeis Placentula, Cymbella ventricosa, Diatomella Balfouriana, Diplo- 

 neis ovalis V. oblongella, Epithemia Zebra, Fragilaria construens, F. vi- 

 rescens, Gomphonema acuminatum f. coronala, Mclosira crcnulata, Navicula 

 anglica, N. brekkaensis, N. contenta, N. cryptocephala v. angusta, N. c. v. 

 exilis, N. mutica f. Cohnii, N. radiosa. Nitzschia Palea v. pcrminuta, Pinnu- 

 laria appendiculata v. irrorata, P. borealis, P. gracillima, P. subcapitata, 

 P. viridis v. commutata, Bhopalodia gibba). 



