799 



As to the 111 Fseroese species wanting at Greenland, they are 

 niostl}'^ species also wanting at Iceland (namely the 54 species men- 

 tioned as belonging to group III and group IV p. 793 — 94), and in 

 addition the following 57 species: Porphyra coccinea, Chantransia 

 AIaria% Chondriis crispiis, Gigartina mamillosa, Phyllophora mcmbra- 

 nifolia, Ahnfeltia plicata, Cystocloniiim piirpiuascens, Lomentaria rosea, 

 L. clavellosa, Plocamiiim coccineiim, Delesseria alata, D. sanguinea, 

 Polysiphonia fastigiata, P. nigrescens, Pterosiphonia parasitica, Odon- 

 thalia dentata, Callithamnion arbiisciila, C. scopiiloriim, Plumaria ele- 

 gans, Ptilota pliimosa, Ceraminm acanthonotiim, Diimontia fdiformis, 

 Criwria pellita, Phymatolithon polymorphiim, Lithothamuion Lenor- 

 mandi, Lithophylliim Crouani, L. macrocarpiim, Corallina officinalis, 

 Petroderma macaliforme, Myrionema vulgare, M. Coriinnce, M. fceroense, 

 M. speciosiim, Ectocarpiis tomentosiis, E. fasciciilatus , E. Hincksice, 

 PhcEostroma parasiticiim, Dictyosiphon Ekmani, Desmarestia ligulata, 

 Leathesia difformis, Laminaria fceroensis, L. hyperborea, Fucus spiralis, 

 Pelvetia canaliculata, Codioliim pusilhim, Enteromorpha Linza, E. cla- 

 ihrata, Prasiola furfuracea, P. stipitata, Acrochcete repens, A. albescens, 

 Dermocarpa Farlowii, Hyella endophytica, Phormidium autumnale, 

 besides the 3 referred only to the genus. These 111 species are 

 almost all of a more southern distribution and belong to the warm- 

 boreal and cold-boreal groups. 



As to the 65 species found at Greenland and not at the Faeroes, 

 they can be referred to the following groups: 



The arctic group: Ceratocolax Hartzii, Callymenia sanguinea, 

 Turnerella Pennyi, Delesseria Baerii, D. Montagnei, Polysiphonia arctica, 

 Dilsea Integra, Petrocelis polygyna, Cruoria arctica , Lithothamnion 

 foecundum, Ectocarpus pycnocarpus, Omphalophyllum ulvaceum, Kjell- 

 mania snbcontinna , Coelocladia arctica, Dictyosiphon corymbosum, 

 Myriocladia callitricha, Laminaria solidnngula, L. cuneifolia, L. groen- 

 landica, L. nigripes, Monostroma groenlandicum, M. leptodermnm, Ulo- 

 thrix scntata, Arthrocha^te penetrans, Chcetobolus gibhus, Urospora 

 crassa; 26 species in all. 



The subarctic group: 



Subdivision 1 : Peyssonnelia Rosenvingii, Lithothamnion tophi- 

 forme, Ralfsia ovata, R. deusta, Myrionema Laminarice, Ectocarpus 

 helophorus, E. ovatus, Sphacelaria racemosa, Phceosaccion Collinsii, 

 Symphyocarpus strangulans, Delamarea attenuata, Coilodesme bulligera, 

 Dictyosiphon hispidus, Saccorhiza dermatodea, Laminaria longicruris. 



