NOTICES OF BOOKS. 89 
Potices of Books. 
The Desmidiee of Norway. Bidlrag till Kannedomen om Sydliga 
Norges Desmidiéer. [A Contribution to the Knowledge of the pe 
midies of Southern Norway. ¥ orpstEDT. Lunds Univer- 
sitets Arsskrift, tom. ix., 1872, published September, 1873. 
THE present occasion is the first of late years that the Desmidice of 
Norway have been made the subject of research. In the older authors, 
so far as known to Nordstedt, not one Norwegian locality has been 
recorded for any of these plants. In Rabenhorst’s ‘ Flora Europea 
Algarum Ague dulcis et ‘submarine ” (1868) there are only three 
as he remained but a limited time at each place, however, it is evident, 
he observes, that the localities visited are far from being full 
examined. He states that the = ae was ‘nok favourable for such 
researches, as the summer was unusually dry. As in other places so 
in Norway, Sphagnum pools are the best localities. In one place near 
Kristian sand, as an example of the richness in species, he met with on 
a single visit no less than ninety-four forms in one and the same 
water. Even in the alpine regions a permeate species might be 
or lower down near the aes These species are: Cos ium 
monochondrum, n.s., C. heaalobum, C. crenatum, C. costatum, C. eycli- 
which, indeed, but more rarely, met with in other localities 
arium speciosum, C. tetragonum (form), C. holmiense, C. anceps, 
C. nas , C. calatum, and Stawrastrum amenum (form). All these 
trl except the new ones, occur indeed either in es or 
ee d. 
tring in Norway but not recorded for Sweden. The number of 
pis common to Norway and Sweden thus reaches 229, and in both 
