200 CHAETOPHORACEAE 
has been undergoing investigation in the above species although it 
is not entirely in agreement with it. It does agree in one of the 
main points, that of forming groups of short, branch-bearing cells. 
* * * As this is a characteristic of no other species, to my knowl- 
edge, it seems necessary to connect it with that name." 
Possibly the plant treated by this author was an abnormal form 
of Stigeoclonium flagelliferum ; it certainly was not typical of the 
species. The point to be noted is, that because it agreed in one of 
the main points, the author found it necessary to connect it with 
that name, and thereupon proceeded to rewrite the description of 
one of the best characterized species in the genus in such a way as 
to fit her plant, changing some important points so as to transform 
the character of the description—and all this to avoid adding to 
the existing confusion ! 
It might be remarked parenthetically, that in almost every 
instance where Wolle stretched a description in order to squeeze 
his specimen into it, his form has to be questioned, and less con- 
fusion would have resulted by the addition of several new species. 
It is inconceivable that one having any familiarity with Kutz- 
ing’s plates—and lacking such familiarity one ought never to at- 
tempt to treat this genus—should have described the branches of 
S. flagelliferum as “rarely opposite," thus removing it from the 
group of species with which it is really most closely associated. 
The fact that Pilinia diluta Wood represents a stage in the 
life history of some specimens of Stigeoclonium is most admirably 
worked out in Miss Tilden’s paper. The conclusion, however, 
that Piinia as a genus is only a form genus to be included in 
Stigeoclonium is wholly unwarranted. It overlooks the true Pilinta, 
P. rimosa Kütz., and the other marine forms, Acroblaste and 
Chaetophora maritima, that have been associated with it. 
4. Myxonema subuligerum (Kütz.) 
Stigeoclonium subuligerum Kitz. Spec. Alg. 354. 1849; Tab. 
Foye 3-3» cy E و ھی‎ 
S. protensum subuligerum Rabenh. Flor. Eur. Alg. 3: 378. 
1868. (?) DeToni, Syll. Alg. 1: 200. 1889. 
More or less tufted, 5 mm. or more in length; filaments very 
much branched ; main branches opposite or approximate, spread- 
