Classification of Green Alga. 
i9 
This removal resulted in making the limits and arrangement of 
the two former groups more natural, but the Confervoideae still 
remained a largely artificial assemblage. Bohlin (1901), in a 
striking paper on the phylogeny of the Green Algae and Archegoniatae, 
has made several further important changes in the position of 
genera. Many of these are so much in accordance with the trend 
of our own views that we have not hesitated to adopt them. We 
have for instance taken the opportunity to break up the group of 
Confervoideae altogether, and, with Bohlin (1901), to institute a 
series, the Ulotrichales, including only those members of the old 
Confervoid group which seem to belong naturally together. We 
have departed however from Bohlin’s classification by separating 
the Ulvaceae (the apparent connexion of which with Ulotrichaceae 
we do not believe to be a real affinity) as a distinct series the 
Ulvales. Bohlin has also proposed to make the genus Microsporn, 
previously included in Ulotrichaceae, the type of a separate series of 
Chlorophyceae—the Microsporales—on account of its aberrant 
characters. We are not inclined to think however that the facts 
warrant more than the creation of a new family of Ulotrichales to 
receive it. We entirely concur with Bohlin in removing the 
septate coenocytic forms, Cladophora and its allies, away from the 
neighbourhood of the Ulotrichaceae to the Siphoneae next the 
Valoniaceae, an affinity which has often been suggested, but 
apparently never expressed in a scheme of classification. Bohlin’s 
removal of the CEdogoniaceae from the Confervoideae, and his 
establishment of a separate series—the Stephanokontae—for its 
reception, also seems justified by the numerous unique characters 
of the family. 
Bohlin has also removed Vauchcria from the Siphoneae and 
included it in the Heterokontan class as the type of a new series, 
the Vaucheriales. Its position here must be admitted to be 
isolated, but certainly less so than among the pure-green Siphoneae, 
where, in spite of its constant use in lectures and text-books as an 
elementary type of the group, it has always seemed an excessively 
anomalous genus. 
In the class of Glaucophyceae will be included those forms of 
Algae (other than Cyanophyceae) in which a blue pigment is associated 
with the chlorophyll. 
