ramifications are filiform and quite simple ; in fertile ones they bear closely 

 much branched corymbs of minute inflexed fructiferous ramuli. The tetra- 

 spnres are globose/tripartite, sliortly pedicellate, and issue one from each 

 articulation of the ramulus, along its inner face. The apices are obtuse. 

 The articulations are cylindrical, with wide hyaline borders, and many times 

 longer than their diameter ; those of the smaller branches and ramuli be- 

 come gradually shorter upwards. The colour is a brilliant rosy-crimson. 

 The substance is crisp when fresh, but soon softens on exposure, and rapidly 

 decomposes in fresh-water. In drying the plant closely adheres to paper, 

 which it stains carmine. 



A brilliantly coloured species, with a good deal of the aspect, 

 ramification, colour, and substance, but not i\\Q fruit, of Griffilhsia 

 setacea : for which, except when in fruit, it might readily be 

 mistaken. Both plants, when thrown into fresh-water while still 

 living, are apt to burst their cells with a crackling noise, dis- 

 charging the endochrome with violence ; and if not soon removed 

 and placed on paper (which they stain with a deep carmine) de- 

 compose in a few minutes. 



Fio-. 1. Callithamnion Griffithsioides, — the natural size. 2. Apex of 

 a branch, with corymbose terminal ramuli. 3. A corymb of tetraspores 

 from the same. 4. One of the tetraspores on its pedicel : — the latter figures 

 variously magnified. 



