6 



they cannot be identified. Besides three species formerly known as Danish, the 

 following may be mentioned: Enteromorpha intestinalis (L.) Link (Conferva int. 

 Schum.), Cladophora rupestris (L.) Kiitz. (Conferva rap. Schum.), Chordaria flagelli- 

 formis (Miill.) Ag. {Ceramium longissinmm Schum.), Ahnfeltia plicata (Huds.) Fr. 

 {Ceram. plicatum Schum ), Fucus serratus (L.), Fucus vesiculosus L. and Rivularia atra 

 Roth [Linckia hemisphcerica Schum.). Further Lyngbye believed that he was able 

 to identify Elachista fucicola (Veil.) Fr. (Conferva ferruginea Schum.) and Chondrus 

 crispus (L.) Lgb. [Fucus ceranoides Schum.) ^ 



No further information on Denmark's marine Algae appears in the 2nd edition 

 of Hornemann's "Plantelsere" ^' published 3 years later. Only 11 species, all referred 

 to the genus Fucus, are noted, but not a single one is expressly mentioned as 

 found in Denmark. 



It was only in the 2nd decade of the 19th century that a more exact study 

 of the Algae was begun in this country, first by N. Hofman Bang, the owner of 

 Hofmansgave on the north coast of Fyen, and at his instigation also by H. C. Lyngbye, 

 private tutor at Hofmansgave from 1812 — 1817. The publisher at that time of 

 Flora Danica, Hornemann, who was in close connection with these two investi- 

 gators of Algae, included in this work during the years 1813 — 1818 25 species of 

 marine Algte from Denmark, mostly until then unknown in its flora; the number 

 of the species was by this addition more than doubled, but a decisive change was 

 not accomplished until the publication of Lyngbye's hydrophytology ''. This work 

 was originally written in 1817 as an essay to which the University had awarded a 

 prize in the previous year, but it was enlarged so much later that the Algae from 

 Holstein, the Faeroes, Iceland, Greenland and also partly from Norway all came 

 to be included in it. On the whole 323 species are mentioned here, for Denmark 

 about 100 species with 12 varieties of marine Algae; Denmark thus I'ose at once to 

 the level of the countries, in which the algal flora was relatively well investigated. 

 This work holds a good place as one of the main works among the earlier descriptive 

 phycologies by reason of its careful descriptions of species and its numerous good 

 figures. With regard to Denmark it is essentially based upon numerous collections 

 by Hofman Bang and b}' Lyngbye at Hofmansgave and upon studies of the latter 

 at the same place, in less measure upon collections in the Sound, while other lo- 

 calities are very incompletely represented. Consequently it deals relatively exhaus- 

 tively with the algal flora of the north coast of Fyen, while it gives very little 



' Among these species Ceramium cartilagineum (1. c. p. 112) must also be mentioned. Lyngbye 

 who had the opportunity to examine Schumacher's specimen, found between Amager and Sja;lland, dis- 

 covered that it really belonged to Fucus cartilagineus Turner (= Gclidium cartilaijineum (Turn.) Gaill.) 

 a species, the native place of which is at the Cape of Good Hope, and he found that, in regard to the 

 epiphytic animals it also agreed with samples of this species from that place, consequently he was 

 right in concluding that it in some way, e.g. by a ship, had been transported from its original, far- 

 off home (Lyngbye Hydr. p. 56). 



- J. W. HoRNEMAN.N, Fors0g til en dansk oekonomisk Plantelare. Kj0benhavn 1806. 



' H. C. Lyngbye, Tentamen Hydrophytologiae Danicae Hafniae 1819. 



