Abstract
DANISH botanists are to be congratulated on the thoroughness with which they pursue the investigation of their possessions, and in no group has research been more active than in alæ. Quite apart from the masterly researches by Rosenvinge on the marine alæ of Denmark, papers on the alæ of the Faröes, Iceland, and the Danish West Indies are familiar to all algologists. The most recent treatise completes the series on the freshwater alæ of Iceland. The marine alæ of this island were dealt with by Jonsson in 1912, marine diatoms by Østrup in 1918, freshwater diatoms in 1920, and the freshwater Cyanophyceæ by J. B. Petersen in 1923. Petersen's last treatise (which, it may be explained, is bound up with his “Freshwater Cyanophycæ” with continuous pagination, in the “Botany of Iceland” series) deals with those land species which he designates Aerial Algae. Under this term are included all alæ which do not grow in water or are able to grow, in periods at any rate, without being immersed. In addition to the systematic list with critical notes, there is an interesting ecological account occupying 37 pages, and the work as a whole maintains the high standard of the previous publications.
The Botany of Iceland.
Edited by Dr. L. Kolderup Rosenvinge Dr. Eug. Warming. Vol. 2, Part 2. 7: The Fresh-water Gyanophyceœ of Iceland, by Johs. Boye Petersen; 8: The Aërial Algæ of Iceland, by Johs. Boye Petersen. Pp. 249–447. (Copenhagen: J. Frimodt; London: Wheldon and Wesley, Ltd., 1928.) 8.00 kroner.
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Biology. Nature 124, 534 (1929). https://doi.org/10.1038/124534a0
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DOI: https://doi.org/10.1038/124534a0