19 13- Cotton. — Marine Ali>^ac of Sallccs. 195 
III. MARINE ALGAE. 
BY A. D. COTTON. 
The collection of marine algae made by Mr. Praeger on 
the Saltees, supphes a substantial addition to our knowledge 
of the marine flora of S.E. Ireland. According to the 
scheme devised by Adams, the islands come under the sub- 
province of Li of Leinster, and the list for that region was 
poorer than for any other sub -division of Leinster or Munster 
(see /.iV., vol. xx., 1911, p. 87). The total number of 
species hitherto hsted was 63 (Cyanophyceae 2, Chloro- 
phyceae 11, Phoeophyceae 18, Florideae 32). The total 
number collected by Mr. Praeger is 120, the groups being 
represented as under : — Blue Green i, Green 17, Brown 39, 
Red 63. The collection, as a whole, was such as one would 
expect from the south of Ireland, though the fact that some 
of the more important and interesting of the Irish species 
are not represented is significant, and emphasizes the need 
of further work. 
With regard to the nature of the shore and the vegetation 
covering it, Mr. Praeger writes : — " Most of the collecting 
was done in a limited area at either end of the island, where, 
at the junction of the chffs of the southern side with the 
beach of large angular boulders of the northern side, there 
are a number of gulleys and rock -pools. The ' Reds ' were 
mostly obtained at the landing place half-way along the 
north side, where drifted material had collected. Exposure 
is rather great on the cUff-bound southern face, much less 
on the north side. At the two ends, where collecting was 
done, Alaria and Ascophyllum overlap in about equal 
quantity. On the boulder-beach Fuci cover the whole 
shore, with plenty of Ascophyllum. Alaria is dominant 
under the cliffs of the south side." 
A fairly large proportion of the collection consisted of 
species requiring sheltered conditions. These had probably 
drifted from the neighbouring Zostera beds on the main- 
land. Several notably " exposed " species such as Nema- 
lion, Cladophora uncialis and the northern Callithamnion 
