4 TRANSACTIONS AND PROCEEDINGS OF THE [ Szss. LXIX. 
representative than it might have been was the difficulty of 
obtaining a passage from one island to another. 
Since the recent investigations of freshwater alge from 
Iceland and the Faerée Islands by Bérgesen, the present 
contribution is of special interest. 
Bérgesen! records 321 species of freshwater alge from 
the Faerées, exclusive of Diatoms. Of these, 174 are Desmids, 
118 of which are now known to occur from the Orkneys and 
Shetlands. Certain species recorded from the Faerdes are 
conspicuous by their absence from our own collections. Such 
are Euastrum crassum (Bréb.), Kitz; E. insigne, Hass; Xan- 
thidium armatum (Bréb.), Rabenh.; and Micrasterias oscitans, 
Ralfs, var. mucronata (Dixon), Wille, although it is most 
probable that all these occur in the Shetlands, if not in the 
Orkneys also. 
From Iceland, Bérgesen? records 58 Desmids, 50 of which 
occur in the Orkneys and Shetlands. One of the most notable 
of these is Cosmarium Cucumis, Corda, var. magnum, Racib. 
The previous records of freshwater alge from the two 
groups of the Orkneys and Shetlands are very scanty. 
In West’s “ Notes on Scotch Freshwater Alge” (“Journ. 
Bot.,” April 1893) there are the following records from the 
Orkneys :—(Edogonium Itzigsohnii, De Bary, var. minor, West; 
Microspora pachyderma (Wille), Lagerh. [“ Conferva pachy- 
derma, Wille”); M. floccosa (Vauch.), Thur. [“ Conferva floccosa, 
Ag.”]; Tribonema bombycinum (Ag.), Derb. and Sol. [“ Conferva 
hombycina, Ag.” |; Oocystis apiculata, West ; Trochiscia insignis 
(Reinsch), Hansz., f. minor, West; Glwocystis gigas (L.), Lagerh. 
[“Gl. ampla (Kitz), Rabenh.”]; G7. rupestris (Lyngb.), Rabenh.; 
Vroeoceus insignis, Kitz; Gleotrichia Pisum (Ag.), Thur.; Stz- 
gonema turfaceum (Eng. Bot.), Cooke; Cyclotella operculata, 
Kiitz; Navicula eryptocephala, Kiitz; N. dicephala, Ehrenb.; 
N. radiosa, Kiitz: N. Brébissonii, Kiitz. 
In W. and G. S. West’s “ New British Freshwater Algae” 
(« Journ. Roy. Mier. Soc.,” 1894) two species are mentioned 
from the Orkneys: Xanthidium Robinsonianum, Arch., and 
Cosmarium furcatospermum, W. and G. S. West. 
1 F. Borgesen, “Freshwater Alge of Faerdes,” “Bot. of Faerées,” 
Part L, Copenhagen, 1901. 
2 F. Borgesen, “Nogle Ferskvandsalger fra Island,” “ Botanisk Tids- 
skrift,” Bd. 22, 1898. 
