793 



cold-boreal, that of the eastern part arctic, whilst that of the western 

 and northern parts is a mixed flora. As Jonsson intends to enter 

 more fully into a comparison with the adjacent countries, in his 

 paper on the algae-vegetation of Iceland using this division as basis 

 I may avoid too much detail here and simply keep to the two 

 principal divisions: North-East and South -West Iceland. 



The total number of species mentioned by Jonsson from Ice- 

 land is 195^, Of these 195 species, 121 Rhodophycecc and Phceo- 

 phycece and 44 ChlorophycecB and Cyanophycece , in all 165, are 

 found on the southern and south-western part of the country, that 

 is, from L6nshei9i on the south-east coast to Latrabjarg on the 

 north-west coast. F'rom Latrabjarg to Hornbjarg on the adjacent 

 coast of North-West Iceland with mixed flora, we further find the 

 following 7 species: Ceratocolax Hartzii, Phyllophora Brodicei, Actino- 

 coccus subciitaneus, Piinctaria plantaginea, Monostroma groenlandiciim, 

 Acrochcete repens and Bolhocoleon pilifenim, which have hitherto not 

 been found in more southerly places in Iceland. With the latter 

 species the total number becomes 172. 134 of these species and 

 5 from the adjacent coast, 139 in alP, are also found at the 

 Faeroes. 



The 76 Fseroese species which are not found at South-West 

 Iceland can be divided into the following groups : 



I. Species found at North-East Iceland: 



Laminaria fcproensis, Petroderma macuUforme, Codiolum grega- 

 riiim, C. pusilliim, Phormidiiim autumnale. 

 II. Species found at Greenland: 



Chantransia efflorescens, Harveyella mirahilis, Polysiphonia elon- 

 gata, Rhododermis elegans, Sorapion Kjellmani, Ulothrix conso- 

 ciata, Pilinia maritima, Uluella conflaens, Vaucheria coronata, 

 Calothrix scopiilorum. 

 III. Species found on the coast of North Norway: 



Erythrotrichia ceramicola, Chantransia Daviesii, Polysiphonia 

 violacea, Polysiphonia Brodia^i, Rhodomela subfusca, Callitham- 



' According to Mr. Foslie's latest determination, Lithoihamnion circumscriptum 

 must be excluded from the number of species, whilst on the other hand Chantransia 

 microscopica and Vaucheria sphcerospora must be included (compare Borgesen 

 and Jonsson, 12). 



^ Of Phyllophora Brodicei only the subspecies interrupta has been found at 

 Iceland, but the Faeroese specimen is ver}'^ much like it; as to Acrosiplionia , I 

 consider A. flaccida as belonging to A. hijstrix (8, p. 512), and Spongomorpha lanosa 

 to be the same as Sp. vernalis (12, p. XXV). 



