Plate LII. 
Fig. 236. CERAMIUM DESLOKGCHAMPSII. 
Colour. Dark purple ; almost blackish to the naked eye ; on examination variegated with 
white. 
Substance. Kigid (for so delicate a plant). 
Character of Frond. Tufts of distinctly jointed threads {filaments). Filaments nearly as 
thick as hog’s bristles below ; becoming gradually finer upwards ; much branched in 
an irregularly forked manner ; more or less furnished with very slender, simple or 
forked branchlets. Tips fine ; straightish ; spreading. 
Joints. In variegated bands. Colourless and transparent in the middle ; purplish and opaque 
at and near the partition-lines {dissepiments). 
Measurement. From 3 to 4 inches long. 
Fructification. Of two kinds, but only one clearly made out. Tetraspores set round the joints ; 
half-immersed ; very prominent. The other, dark, irregular-shaped lumps like 
clusters of small capsules^ sessile on the stems and branches. 
Habitat. Our coasts generally. On rocks, &c. between tide-marks. Not uncommon. 
Fig. 237. CERAMIUM DIAPHANUM. 
Colour. Pinkish-red in general hue ; but clearly variegated with white. 
Substance. Eather soft. 
Character of Frond. Tufts of distinctly jointed threads {filaments). Filaments the thickness 
of a hog’s bristle below, becoming gradually finer upwards ; irregularly branched ; 
partly forked, partly alternate ; re-branched in the same way, set at greater or less 
intervals throughout with short or long, more or less forked branchlets, much more 
slender than the branches from which they spring. Tips hooked inwards. 
Joints. In variegated bands. Colourless and transparent in the middle, red, opaque, and 
swollen at, and near, the partition-lines {dissepiments), coloured bands wide throughout. 
Measurement. From 2 to 6 inches long. 
Fructification. Of two kinds. 1. Minute spores in roundish capsules, with one or two short 
branchletee? 2 S underneath ; sessile in the last forkings, or on the tips of side branchlets. 
2. Tetraspores set round the joints. 
Habitat. Our coasts generally. On the smaller algae in tide-pools. Common. 
Fig. 238. CERAMIUM FLABELLIGERUM. 
Colour. Dull purple to the naked eye, on examination, of different shades. 
Substance. Eigid. 
Character of Frond. Tufts of jointed threads {filaments) spreading fan-wise above. Filaments 
as thick as hog’s bristles ; irregularly branched ; partly forked ; partly alternate ; 
much re-branched above ; set with forked branchlets. Tips pointed ; straight and 
spreading ; or somewhat curved inwards. 
Joints. In variegated bands, but when young filled with a purplish fluid which hinders their 
detection. Afterwards colourless and transparent in the middle ; purple and opaque 
near the partition- lines {dissepiments). These armed on one side with a solitary, 
minute, coloured (when dry, white) thorn. 
Measurement. From 2 to 3 inches high. 
Fructification. Of two kinds. 1. Minute spores in large irregular-shaped capsules, sessile on 
the branchlets, with two or three short branchletee^zs underneath. 2. Tetraspores set 
round the joints. 
Habitat. Our coasts generally. On the smaller algse, &c. between tide-marks. 
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