DANMARKS BLAAGRONNE ALGER 233 
cases where true chromatophores of the usual construction have 
been described, as in Phragmonema, Glaucocystis, and Asterocystis, 
etc., these alge have been proved to belong to other groups than 
the Cyanophycea, in which they had been wrongly included from a 
similarity of colour. 
The author, like MM. Bornet & Flahault, has failed to find a 
perforating alge have been found in Denmark. 
h i the treatment of Cyano- 
The rest of the paper is devoted to systematic 
_ Sip aheotemnarerence e ° era, which should 
group, beginning with keys to the orders and gen 
: The classification followed is that 
of which there are 
Should not be made to accompany 
however good the old figures may be, 
al nd in thi 
. The second part of Dr. Schmid 
Coccogonea, has yet to be published: may we hope th atop" 
to the practical value of his book by accepting this suggestion ; 
; E. 8. B. 
Journat or Botany.—Vou. 38. [June, 1900.] - 
