3r)6 JOIIS. bOVK l'KTEHSKN 



f. Ciiliinatcii Soil. 



Tlu' c-ullivoteil aren of loelaiul is small. Il luay bo (li\i(ie(l into 

 »tiin* (lionu'lit'ld) and aiahle land. Kvcrv farm has a lun covered 

 wilh a dense, liixurianl growlli ol' perennial grass. Undouhledly 

 various algæ will always be present lliere, l)iit ovidcMilly tlioy rarely 

 Ibrm macroscopically visible growllis. I have collected no samples 

 from li'in. Mr. Mol holm- H ansen look a sample in a slerile glass 

 from the tun at the farm Bjork in Årnessysla. A rultuic ol Ihis 

 sample in a lluid medium developed Ihe following algæ: lh)lnjdi()f)sis 

 minor, Bumilleria exilis, Ihiinilleriopsis brevis, Hormidium /hicchlnm, 

 Trihonenid vnhjare, Ilanlzschid (unpluoxijs v. .verophihi , Pinniilaria 

 borealis. P. intcnnedia. 



Tilied soil is even less common in llie island than grassland. 

 Il is generally used for growing -polatoes. I have collected Iwo 

 samples from potato fieids (297, 338), the (irst-menlioned from Geita- 

 bcrg where the field immediately adjoined the »iila5«. Here I found 

 a growth of Phormidium capitatnm^ Prusiola crispa, besides 7 species 

 of Diatoms of which Navicula Atomus and N. nitrophila were the 

 commonesl. In the second sample I found Botnjdiopsis arhiza, 

 Vancheria hamaia, XavicuUi Ihcrmicola, Pinniilaria appendiculata, 

 P. molaris, and other Diatoms. 



g. Myri. 



Wilh regard to the vegetation of phanerogams on mvri the reader 

 is referred to lielgi .lonsson (1900, p. 23). According to Mølholm- 

 Hansen 's determinations the soil has a comparatively low pH-value, 

 vi/., from 4.8 to 0.3 (se above p. 353). The surface of the mVri is 

 often covered with hillocks, and just as there is a diflerence belween 

 the higher piants on the hillocks and in the depressions between 

 them, so also is there a dilTerence in the algal vegetation. In the 

 depressions it consisls almost entirely of hydrophilous species, l)ut 

 on the hillocks it grows poorer and assumes more of the character 

 of an aerial algal association. In a mvri at a height of 300 m above 

 Seyc^isfjorAur I collected a sample from a hillock (4), which con- 

 lained Stujonema sp., and 7 species of Diatoms, among which were 

 Anomoeoneis hrarhijsira, Pinnnlaria borealis, and P. snbcapilata, which 

 nuist be regarded as good terrestrial Diatoms. Among the mosses 

 in the depressions between the hillocks (samples 3, o) I found the 

 following species: Slic/onema mamillosnni , Fischcrella sp., Mesolæ- 

 niiim sp., Cosmariuin sp., Slif/onema Inrfacciun , Gloeulhece lepidario- 



