[Vor. 4 
302 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
The foregoing list may be summarized as follows: 
Myxophyceae Genera Species 
Coccogoneales ............. (errr rere 10 
Hormogoneales ............ Oia sens puss к» 19 
Chlorophyceae 
Conjugales ............... ТЕГТІ” 1 
Volvocales ................ ЖКТ 1 
Protococcales ............. ——Q 10 
Ulotrichales .............. Delo ERES 5 
Siphonocladiales ........... РИСТЕ 1 
Тоа1]............ Өде йена 47 
Excluding the diatoms, of which there appears to be a con- 
siderable number of species, the algal flora of Devils Lake can 
hardly be regarded as a rich one. Тһе Myxophyceae are, it is 
true, fairly well represented, and the fact that they constitute 
practically 50 per cent of the genera and species present may 
be regarded as one of the effects of the increasing salinity of 
the water. The almost entire elimination of the Conjugales, 
which so frequently constitute the greatest number of species 
in fresh-water lakes, is likewise to be attributed to the high 
content of salts, and perhaps the absence of this order is suf- 
ficient alone to account for the small total number of species. 
With the exception of Spirulina Nordstedtu, all the species 
listed are frequently, if not invariably, found in fresh water, 
so that the algal flora of the lake is to be regarded as typically 
a fresh-water one, showing no effect of the gradual concentra- 
tion of the water. 
Furthermore, of the species identified, it is worthy of note 
that with minor differences of measurement, they were all 
absolutely typical, with no indication of any effect of the in 
many cases unusual, if not unfavorable, environment. The 
increased thickness of the wall in Microspora Loefgrenu was 
the only change from the normal condition which might be 
regarded as having been induced by the salinity of the water. 
It is likewise interesting that so far as the collections made 
are concerned no new genera or species are to be recorded 
