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.) Kütz. (Conferva rup. Schum.), Chordaria flagelli- 
formis (Müll.) Ag. (Ceramium longissimum Schum.), Ahnfeltia plicata (Huds.) Fr. 
(Ceram. plicatum Schum.), Fucus serratus (L.), Fucus vesiculosus L. and Rivularia atra 
Roth (Linckia hemispherica Schum.). Further Lynepye believed that he was able 
to identify Elachista fucicola (Vell.) Fr. (Conferva ferruginea Schum.) and Chondrus 
crispus (L.) Lgb. (Fucus ceranoides Schum.)!. 
No further information on Denmark's marine Algæ appears in the 2nd edition 
of Hornemann’s “Plantelære”? 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 Algæ was begun in this country, first by N. Horman Bane, 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 Algæ, included in this work during the years 1813—1818 25 species of 
marine Alge 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 Algz from 
Holstein, the Feroes, 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 Algæ; Denmark thus rose 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 Horman Bang and by 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 
1 Among these species Ceramium cartilagineum (l. c. p. 112) must also be mentioned. LyNGByE 
who had the opportunity to examine SCHUMACHER’s specimen, found between Amager and Sjælland, dis- 
covered that it really belonged to Fucus cartilagineus Turner (= Gelidium cartilagineum (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). 
2 J. W. Hornemann, Forsøg til en dansk oekonomisk Plantelere. Kjøbenhavn 1806. 
3 H. C. LyNGBYE, Tentamen Hydrophytologiæ Danicæ. Hafniæ 1819. 
