354 
on the same branch, and that the monospores were really ripe was 
proved by the fact that branches bearing monospores only also 
showed numerous empty monosporangia. The monospores (about 
19 p long and 11 broad) are somewhat smaller than the tetraspores 
which are about 23 p long and about 16 p broad. Except for 
the tetraspores, the plant is exactly like a Chantransia and has star- 
like chromatophores situated round a large central pyrenoid. 
Further, a few tetraspores occurred on a small Chantransia which 
I have also referred to this species; it grew abundantly on Cysto- 
clonium pnrpurascens from Klaksvig. 
Lastly, I am of opinion that a small, elegant plant which was 
observed on a conceptacle of Himanthalia Lorea from Frodebo pre¬ 
served in spirit ought to be referred to this species (fig. 54); it oc¬ 
curred as small, semiglobular, cushion-like growths of the size of 
a pea, and in the accompanying figure some portions of the plant 
are shown. As far as I could see, it bore tetraspores only, so I 
naturally to begin with regarded it as a Rhodochorton , but on closer 
examination and after comparison with the above-mentioned spe¬ 
cimens it appears to me unquestionably to belong to Ch. virgatula. 
The plant has a distinct basal disc whence proceed erect filaments. 
These are richly branched and the branches are sometimes alter¬ 
nate (occasionally more or less secund) and sometimes mostly oppo¬ 
site especially in the upper part. The branches generally terminate 
in short hairs. The branches springing from the lower part of the 
erect filaments are often prolonged into long branches like the fila¬ 
ments whence they proceed, while those occurring higher up gradu¬ 
ally become shorter and either bear tetraspores or produce a new 
series of branches. The oval or obovate tetraspores are sometimes 
terminal, sometimes lateral, and in the latter case secund or oppo¬ 
site, they are about 23 p long and about 16 p broad. The fila¬ 
ments when thickest attain to' a thickness of about 30 p, the thick¬ 
ness of the upper part of the filaments and of the branches ave¬ 
raging 10 p. The cells may be as much as 4—5 times as long as 
they are broad and the thicker cells are usually rather swollen 
especially towards the top. Judging from the material preserved 
in spirit, the chromatophores are star-like with a large central 
pyrenoid. 
As mentioned above, this species comes very near to Ch. secnn- 
data, and they are often difficult to distinguish from each other, 
as Kuckuck writes to me is also his experience, the fact that both 
