Plate LV. 



Fig. 250. GEIFFITHSIA BAEBATA. 



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 {filainents); 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 branchleteew-.?, 

 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 branch let("6;i5. 



Habitat. The coasts of the British Channel. Jersey, &c. On the smaller algae in 

 tide-pools. Very rare. 



Fig. 251. GEIFFITHSIA 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) wide-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^i^, 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. Eare. 



Fig. 252. GEIFFITHSIA COEALLINA. 



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-. secundiflora; 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, slejider branchletee?^^; sessile on the sides of the branches. 2. Tetra- 

 spores on the inner side of special branchletf3d^^s surrounding the partition - 

 lines {dissepiments) of the joints. 



Ilahilat. Our coasts generally. On rocks near low- water mark; generally in deep 

 pools. Not uncommon. 



35 



