Fig. 281. CALLITHAMNION DAVIESIL 



Colour. E-ose-red. 

 Substance. Soft. 



Character of Frond. Very minute tufts of fine, jointed threads {filaments). Fila- 

 ments very much branched. Branches spreading; curved; of unequal leno^ths; 

 scattered; bearing little clusters of branchlets at their angles of branching 

 (axils)] the rest of the stems bare. 



Joints. Visible throughout. 



Measurement. One-quarter of an inch or thereabouts, high. 



Fructification. Only one kind known. Minute, oval, stalked tetraspores borne on 

 the shortest of the clustered branchlets; single or clustered. 



Habitat. Our coasts generally, but preferring warm stations. Parasitic on Ceramium 

 rubrum and other algse; in pools between tide-marks. Not uncommon. 



Fig. 282. CALLITHAMNION VIRGATULUM. 



Colour. Rose-red. 

 Substance. Soft. 



Character of Frond. Very minute tufts of fine, jointed threads (filaments). Fila- 

 ments once or twice divided; very upright ; set with secund, rod-like branches; 

 bearing at each joint a short, blunt, bud-like branchlet; several on one side 

 in succession. 



Joints. Visible throughout. 



Measurement. One-quarter of an inch, or thereabouts, high. 



Fructification. Only one kind known. Minute, oval tetraspores borne on the bud- 

 like branchlets, or in their place at the joints. 



Habitat. Our coasts generally. On Ceramium rubrum and other algse, between tide- 

 marks. Not uncommon. 



Fig. 283. CALLITHAMNION PEDICELLATUM. 



Colour. A fine red; easily given out in fresh water. 

 Substance. Soft. 



Character of Frond. Longish tufts of jointed threads (filaments) much branched. 

 Filaments as thick as horse-hair, loosely and irregularly divided. Branches 

 furnished with short, alternate clusters of branchlets; sometimes one to each 

 joint, almost; more or less forked and spreading; their tips very obtuse. 



Joints. Visible throughout, and very pellucid. 



Measurement. For 2 to 8 inches long. 



Fructification. Of two kinds. 1. Minute spores in large oval capsules^ single or in 

 pairs; sessile on the stems. 2. Oval or pear-shaped, very dark tetraspores^ or 

 little colourless stalks rising from the angles of branching (axils). 



Habitat. Our shores generally. On rocks and wood-work near low-water mark. 

 Frequent. 



Now Corynospora pedicellata. 



46 



