"Grphinlands Havalger" was the title of Rosenvinge's (1893) first contribution on the seaweeds of Greenland; the work was reviewed by Batters (1894) in Grevillea. Pedersen's book with the same title may be regarded as a new, improved edition, as it critically updates a century of knowledge. The author makes available data that to a great extentis derived from his own studies, which range from field collections and observations overa period of 40 years to numerous experimental investigations of algal strains in laboratory cultures. The latter approach has been more or less abandoned nowadays in favor of molecular techniques. However, laboratory cultures provided invaluable information onthe "autoekologi" of species (p. 8), revealing life history types, patterns of vegetative growth, reproductive structures, chromosome numbers, which, along with hybridization attempts, have enabled application of a range of criteria in the recognition ofalgal species.There is no doubt for whom the book is written. It is written in Danish and Pedersen wants to reach students and the general public, providing all necessary information that both explains basic facts and attracts interest. The book is divided into nine chapters and also includes a preface, an account of author's introductory steps (pp. 6-9), a brief lexicon (p. 197), an appendix with the latitudinal distribution of species on the west coast of Greenland (between 60° and 81° lat., pp. 198-199), a literature list (pp. 200-201), and apart from a subject index (pp. 206-208) there are also indices to Danish-Latin andLatin-Danish names of the common species (pp. 202-205).
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