or olive green, formed by the plant here figured, which adheres 
so closely to the surface of the rock that it can only be removed 
in flakes by scraping with a knife. It was first noticed on the 
shores of Norway and the Feeroe Islands, and has since been 
found in many places along the Atlantic coasts of Europe, and 
probably exists in many others where hitherto it has been over- 
looked. I have vainly examined numerous specimens in search 
‘of the fructification, described by Capt. Carmichael, who disco- 
vered it after the examination of more than a hundred. The 
large cell near the middle of the filaments, which I find on my 
specimens, has not been noticed by other authors who have des- 
cribed or figured the plant, yet it constitutes a very remarkable 
feature. Possibly it may not be always so obvious. It is hard 
to say whether it has any connection with the fructification, or 
what peculiar function it may perform in the economy of the 
plant, but it appears to have at least an analogical resemblance 
to what are called connecting cells in Spherozyga, the office of 
of which is equally doubtful. It can have no relation to the 
spores described by Carmichael, which would appear to be 
formed from an alteration of ‘the whole filament; not from a 
solitary jomt. Whether it undergoes any change at a later 
period has not been observed. 
Fig. 1. CRUORIA PELLITA, growing on a piece of rock :—of the natural size, 2. 
Portion of a vertical section of the stratum. 3. Tuft of filaments removed 
and opened. 4. Some of the filaments separated :—wmore or less highly 
magnified. 
