On tHE PITHOPHORACER. 41 
In order to avoid prolixity and give, at the same time, a clear in- 
dication of my manner of viewing the closer or farther removed affinities 
between Pithophoracee and the other classes and orders of the polymor- 
phous chlorophylliferous algz, I here give a sketch of these alge, 
arranged in the form of a genealogical tree. A more particular account 
of the motives of this attempt at arrangement it is my intention to 
publish on another occasion. *) 
The genealogical tree of the Chloro- 
phyllophycee, see the following page. 
As every one knows, Cohn and Sachs have lately in their sys- 
tems of plants *) given expression to the opinion that in the Alg@ and 
in .the Fungi (Thallophyte Cohn) only characters obtained from the 
nature of the reproduction and the reproductive organs are of value in 
the systematizing *) (which is to me the same as in the looking for the 
natural affinities or, in other words, the genetic connexion between the 
forms of plants). That the principles by which I have been conducted 
in the composition of the table given below, differ essentially from 
1) J need hardly mention that I do not regard all the groups, below indicated 
as classes and orders, as having as yet perfectly natural limits. The groups of for 
instance Siphonee, Palmellacee, Chetophoree, Ulvacee and Confervacee will, in all 
probability, be found on a nearer examination to embrace more than one type of ~ 
order. — Whether the Diatomacee ought to have their place in the class of the 
Conjugate, or not, seems to me dubious. Perhaps they belong to another series of 
development, and are in that case only analogous, not affined, to Conjugate De Bar. — 
On the characters of the class of the Oedogoniaceea, see Wittr. Prodr. Monog. Oedog. 
p- 1, the note. 
?) Published: Cohn’s in Hedwigia 1872, page 18 (somewhat modified in Entw. 
d. Volvoz page 113), and that of Sachs in Lehrb. d. Botan. 4:te Aufl. pages 248, 249. 
3) It is known that this is not the first time that a fusion has been attempted 
between the Alge@ and Fungi. As early as nearly 30 years ago Nigeli says on 
this head in Neu. Algensyst. pages 169—-170 as follows: »Wenn man die Pilze wegen 
ihrer von allen iibrigen Pflanzen abweichenden Entstehungsweise, Lebensart und Be- 
schaffenheit des Zellinhaltes nicht als besondere Pflanzengruppe bestehen lassen will, 
so gibt es gewiss kein Merkmal der Fructification, wonach sich Algen, Flechten und 
Pilze kennen liessen, weil alle Arten der Samenbildung der Pilze auch bei den Algen 
sich finden, und es bliebe keine andere Wahl, als sie alle zusammen zu werfen und 
dann die ganze Masse nach Bau und Fortpflanzung in Gruppen zu theilen, und dabei 
fortwihrend Pilzgattung neben Algengattung zu stellen, was aber gewiss zu ciner 
ganz unnatirlichen Anordnung fiihren wiirde.» (The italics are mine). 
Nova Acta Reg. Soc. Sc. Ups. Ser. III. 6 
