Plate LV. 
Fig. 250. GRIFFITHSIA BARBATA. 
Colour. A beantifulj clear, rose-red ; very soon given out in fresli water. 
Substance. Soft ; gelatinous ; tender ; soon decomposing in the air, and after a few minutes’ 
immersion in fresh water. 
Character of Frond. Dense tufts of jointed threads {filaments') ; forming a circle when spread out. 
Filaments slender below ; becoming still more so above ; repeatedly forked ; each joint 
slightly swollen upwards ; the last few furnished with long, opposite, or surrounding 
{wliorled) hair-like, jointed branchletee?^s, on which the tetraspores are borne. 
Measurement. From 2 to 3 inches long. 
Fructification. Of two kinds. 1. Minute spores in globose, stalked capsules; enfolded by 
special, slender branchletee/^s {ramelli). 2. Tetraspores^ globose, borne on the hair- 
like, jointed branchletee?zs. 
Habitat. The coasts of the British Channel. Jersey, &c. On the smaller algas in tide-pools. 
Very rare. 
Fig. 251. GRIFFITHSIA DEVONIENSIS. 
Colour. A beautiful, clear, rose-red ; very soon given out in fresh water. 
Substance. Soft ; gelatinous ; tender ; soon decomposing in the air, and after a few minutes’ 
immersion in fresh water. 
Character of Frond. Dense tufts of jointed threads {filaments) ; forming a circle when spread 
out. Filaments very slender throughout ; repeatedly forked ; the lower angles of 
branching {axils) wdde-spread ; the upper narrow ; the lower branches often throwing 
out root-like fibres which connect the filaments together below. Partition-lines 
{dissepiments) contracted. 
Measurement. From 2 to 3 inches long. 
Fructification. Only one kind observed. Tetraspores on the inner side of special branchletee? 2 S, 
which surround the partition-lines {dissepiments) of the joints ; always below the last 
forkings. 
Habitat. South coasts of England. Muddy sea-shores in deep water. Bare. 
Fig. 252. GRIFFITHSIA CORALLINA. 
Colour. A beautiful, clear, rose-red ; which is very soon given out in fresh water ; fading 
very quickly. 
Substance. Soft ; gelatinous ; tender ; soon decomposing in the air, and after a few minutes’ 
immersion in fresh water. 
Character of Frond. Tufts of strongly marked, jointed threads {filaments) ; forming a 
circular outline when spread out. Filaments more robust even than those of 
G. secundifiora ; repeatedly and nearly regularly forked ; the angles of branching 
{axils) wide-spread ; divisions more distant below, very close above ; each joint 
swollen upwards, pear-shaped ; contracted at the base. 
Measurement. From 2 to 4 inches long. 
Fructification. Of two kinds. 1. Minute spores in roundish capsules, enfolded by special, slender 
branchlete6?is ; sessile on the sides of the branches. 2. Tetraspores on the inner side 
of special branchleteews surrounding the partition-lines {dissepiments) of the joints. 
Habitat. Our coasts generally. On rocks near low-water mark; generally in deep pools. 
Not uncommon. 
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