in the former case each tetraspore is usually accompanied by a short un- 
altered cell or subtending ramulus. Colour, a fine, clear, crimson lake. 
Substance membranaceous, adhering to paper. 
PILI 
A beautiful little parasite, discovered originally by the late 
Miss Hutchins on the shores of Bantry Bay, and since detected 
in many distant points of the coast of Europe. It seems to be 
pretty much confined to the stems of Laminaria digitata, which 
it sometimes clothes in patches, looking like shreds of crim- 
son velvet. Diullwyn’s figure represents the upright stem as 
perfectly simple, the whole plant strictly resembling a little 
feather. I have sometimes met it so, but it is more usual to 
find one or two branches rising from the lower part, as shown in 
our figure. Among Capt. Carmichael’s MSS. is a figure showing 
a much more compound state of this plant: noticed by him on 
the west of Scotland, and this figure closely agrees with the 
description given by Lyngbye and Agardh of the species as it 
occurs in the north of Europe. C. Pluma is nearly allied to 
C. Turneri, from which it chiefly differs in the smaller size and 
shorter articulations, and in having the lower part of the stem 
and branches constantly naked. 
een 
Fig. 1. Patch of CaLLirHaMNIon PLuMa growing on the stem of Laminaria 
digitata :—the natural size. 2. Fronds from the same :—magnified. 3. Ra- 
mulus, with a ¢etraspore. 4. Apex of a young frond :—oth highly mag- 
nified. 
