information about the distribution of the species within the Danish area. As 
LYNGBYE's work will be cited in the following pages when dealing with the single 
species, its importance to the knowledge of the Danish marine algal flora need not 
be more closely explained here. 
During the following years several Danish marine Algz were included in the 
parts of Flora Danica published by HORNEMANN, without anything essentially new 
being given in addition to what is found in LyNGByE’s work. 
A greater increase in the number of Danish species appears in the 3rd edition 
of HorNEMANN’s “Plantelere”!, the number here reaching 127. The real increase 
was however far from being so great. Thus, two of the species mentioned belong 
to the animal kingdom (Alcyonidium diaphanum and flavescens); some seem to have 
been included by mistake as found in Denmark, as they have not been discovered 
here by others and no Danish specimens are known (Spherococcus ciliatus, S. laci- 
niatus, Zonaria dichotoma). Several of the new species are scarcely sufficiently distinct 
from others found earlier, e. g. several Hutchinsia-species, Vaucheria litorea Ag. 
(V. clavata Lgb.) etc. But even after these reductions, a number of real additions 
remain of which the most important are: 
Calothrix fasciculata Ag. Halymenia palmata Ag. (Rhodymenia pal- 
Rivularia pellucida Ag. mata) 
Bryopsis plumosa Ag. Rhodomela dentata Ag. (Odonthalia den- 
Ectocarpus tomentosus Ag. tata Lgb.) 
Zonaria deusta Ag. (Ralfsia verrucosa) Callithamnion roseum Ag. 
Chordaria divaricata Ag. Ptilota plumosa Ag. (Plumaria elegans) 
Bangia atropurpurea Ag. (B. fuscopurpurea) Halymenia edulis Ag. (Dilsea edulis) 
Two years later LIEBMAN? made some new additions to the Danish marine 
algal flora. A great part of these species were however not really new in the flora; 
thus his Laminaria latifolia is only a form of L. saccharina, Asperococcus echinatus = 
Scytosiphon Lomentaria, Punctaria cespitosa = Phyllitis Fascia, Sphacelaria cœspitula 
not identical with LYNGBYE's species of that name but perhaps only small specimens 
of Sphacelaria cirrosa, Polysiphonia lepadicola — P. urceolata. — New to the flora 
are however at all events Callithamnion pyramidatum Liebm. = C. fruticulosum J. 
Ag. and Lyngbya lutescens Liebm. = L. lutea (Ag.) Gom., and probably Ptilota plu- 
mosa. His Dictyota dichotoma is also new, but however, as the specimens prove, is 
Taonia atomaria; but this Atlantic species cannot have grown on the coasts of Den- 
mark, but must probably have been transported by a ship. 
A smaller contribution to the flora was given by ØRSTED in 1841 in an ac- 
count of an excursion to an alluvial deposit at Hofmansgave”, where some blue- 
1 J. W. HORNEMANN, Dansk oeconomisk Plantelære 3. Udg. 2. Del. 1837. 
? F. LIEBMAN, Bemærkninger og Tillæg til den danske Algeflora. Kroyer’s Naturhist. Tidsskrift 
2. Bd. 5. Hefte, 1839. 
3 A. S. ØRSTED, Beretning om en Excursion til „Trindelen“, en Alluvialdannelse i Odensefjord. 
Kroyer’s Naturhistorisk Tidsskrift 3. Bd. 1841, p. 552. 
