324 APPENDIX. No. XIV. 



The most complete list of the marine algae of Spitsbergen 

 known to me is one given by Professor J. Gr. Agardh, com- 

 prehending seventeen olive and twenty of the red — therefore 

 comparatively rich when contrasted with those above enu- 

 merated : all the species are also included in the Spitsbergen 

 list with one exception, viz. Dictyosiphon. 



The marine species of the green series found by the 

 naturalists of the Expedition are — 



Ulva latissima, L., very fragmentary. 



Enteromorpha clathrata, Grev. 



Chaeto rnorpha Melagonium, Web. and Mohr. 



These have very wide distribution in European and other 

 seas. 



There are also representatives of several genera found in 

 fresh water, namely : — 



Prasiola Sauteri, Menegh. 

 Zygogonium Agardhii, Eabh. 

 Closterium lunula, Muller. 

 Zonotrichia, species. 

 Nostoc commune, Vaucher. 



„ aureum, Ktz. 

 Hormosiphon arcticum, Berk. 

 Hormospora, species. 

 Chroococcus, species. 

 Gloeocapsa Magma, Ktr. 

 Oscillaria tenuis, Ag. 

 Hypheothrix coriacea, Ktz. 

 „ obscura, n. sp. 



Chthonoblastus, sp. 

 Tolypothrix, sp. 



The most abundant of these appears to be Nostoc com- 

 triune, which occurs in Spitsbergen, and is widely diffused in 

 Europe, as indeed also are the other genera. 



Gloecapsa I have previously seen as found at Disco ; the 

 specimens sent to me by Dr. Moss were found at 82° 27' N. 



