. The botany of Iceland. Botany -- Iceland. MARINE ALGAL VEGETATION 109 coast that the smallest species (Pelvetia, Fucus spiralis) are arranged in a separate uppermost belt, while the larger species are arranged in belts lower down, and the largest species (f. inflatus, if the large broad-fronded forms are included) occurs lowest of all. The Fucus spiralis-association (Fig. 4) is more luxuriantly developed than the Pe/Ve//a-association and occurs just below it. On flat or very gently sloping rocks this association forms a compara- tively broad belt, but on a steep coast only a narrow one. Its
. The botany of Iceland. Botany -- Iceland. MARINE ALGAL VEGETATION 109 coast that the smallest species (Pelvetia, Fucus spiralis) are arranged in a separate uppermost belt, while the larger species are arranged in belts lower down, and the largest species (f. inflatus, if the large broad-fronded forms are included) occurs lowest of all. The Fucus spiralis-association (Fig. 4) is more luxuriantly developed than the Pe/Ve//a-association and occurs just below it. On flat or very gently sloping rocks this association forms a compara- tively broad belt, but on a steep coast only a narrow one. Its relation rf!^Tjro2fiNg6gS£x v/£v /i*>* ac%fe«s»Sts^fe?^\i *s^ • »V * ,\ft 5 ^Ef ' •"* " ' * ' J ' ^ r *>rf» - -^ -^ ' ^j/^t*f*-^ *KCl^t -/ ^V V *^. Fig. 4. Fucus spiralis. Part of a luxuriant Fucns spfraZis-vegetation below the Pelvetia- association. Reykjavik, Aug. 13, 1909. (From phot, by Hesselbo.) to exposed coasts has already been discussed. It may happen with Fucus spiralis, as with Pelvetia, that it extends to so great a height that at times it is not wetted dailv bv the sea. In such a case the •/ */ individuals are as a rule smaller, and are often rather strongly spirally twisted; they may be found lying quite dried up on the rocks, apparently without being damaged thereby. The twisting of the fronds may possibly result from the drying process. This belt is, as a rule, somewhat sharply defined from the Fucus vesiculosus-heh situated below. Although it does not always happen that there is any distance worth mentioning between F. spiralis and the upper outposts of the Fucus ^eszaz/osus-association, yet the boundary is almost always sufficiently Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kolderup Rosenvinge, L. (Lauritz), 1858-1939; Warming, Eugenius, 1
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1912
