194 CHAETOPHORACEAE 
Ten years later Fries confirmed the genus, describing the 
species practically in the same order and adding two more. It is 
not surprising that such a grouping was made, for in the general 
appearance of the cells with the girdle-shaped chromatophore and 
the mucous character of the filaments, these two groups have 
more in common than many of the diverse elements at that time 
comprised in the genus Conferva. Now these four unbranched 
species were all placed in other genera before the establishment of 
Kützing's Stigeoclonium and the removal to it of Myxonema lubri- 
cum, our type. Hence whatever method of determining generic 
types is followed, that of residues or that of priority of posi- 
tion, since Myxonema lubricum was both the first species named 
under the genus and also the last to remain in it, the conclusion 
is inevitable that the genus Myronema must stand upon this species. 
Though it is always an unfortunate necessity that compels the 
abandonment of a name long used for a large and comparatively 
homogeneous group like Stigeoclonium Kütz., reasons of sentiment 
cannot weigh in cases of this kind. 
It should be noted that Rabenhorst (’47) at first adopted the 
genus Myronema in practically the same composite sense as used 
by Fries, and that later, instead of keeping the name for part of 
the species, he abandoned it entirely for Kützing's genera Stigeo- 
clonium and Ulothrix, 
Fries (Syst. Orb. Veg. 345. 1825) quotes asa synonym of his 
new genus Myxonema, “ Naematrix Fries, Stirp. Fems.," but we 
have been unable to find the latter name in the work quoted. | 
Perhaps it was a manuscript name which was finally rejected in the 
publication of the Stirpium Agri Femsionensis Index, 1825-6. 
Other authors refer to Myrotrix Fries, Stirp. Fems. 44, as a 
synonym of Jyxonema, but the only species is Myxotrix sonata 
(presumably Ulothrix zonata); since no description or synonymy 
is there given, this name needs no further consideration. 
Frequently one finds young or anomalous forms of Myronema, 
which it is almost impossible to identify with any described 
species. On this account many specimens have been laid aside 
during the preparation of this work. It is very desirable that such 
young forms should receive continued attention, so that they may 
ultimately be associated with their proper species. 
Eee سس‎ 
