Plate LIX. 



Fig. 272. CALLITHAMNION BOKRERI. 



Colour. A brilliant, deep, or pale rose-red, in different specimens; giving out its 



colour in fresh water. 

 Substance. Either rigid or very soft, in different specimens. 



Character of Frond. Tufts of jointed -threads {filaments) very much branched. Stems 

 nearly simple; bare below, or set with only short branches; above furnished with 

 long, spreading, wavy ones; their upper half clothed with branchlets beautifully 

 plumed like a feather, with straight, wide- spread, alternate branchlet^ms; the 

 lowermost longest. Branch let(?(9;^s simple, or re-plumed near their tips: produ- 

 cing a round, blunted outline. 



Joints. Visible throughout. 



Measurement. From 1 to 8 inches long. 



Fructification. Of two kinds. 1. Minute spores in double capsules; sessile near the tips 

 of the branchlets. 2. Grlobose tetraspores; sessile on the inner sides of the 

 branchlet^^?2s. 



Habitat. Our coasts generally. Douglas, Hompton, South coast, &c. On rocks near 

 low-water mark. Rather rare. 



Fig. 273. CALLITHAMNION AFFINE. 



Colour. Pink or red. Substance. Soft. 



Character of Frond. Thread-like {filamentous)] jointed; much branched; bushy; single 

 or tufted. Main stems furnished with very numerous, long, alternate branches, 

 which are re-branched. Secondary branches long, alternately plumed like a 

 feather with branchlets. Branchlets (or plumes) once plumed with branchlete^ws, 

 which are short and upright below; long and crowded upwards. 



Joints. Obscure in the stems, which are opaque and veiny. Visible in the branchlets. 



Measurement. Two or 3 inches Ions:. 



Fructification. Of two kinds. 1. Minute spores in large, roundish capsules; generally 

 two together. Sessile on the stems of the branchlets. 2. Oval tetraspores; 

 generally solitary; sessile on the lowermost cell of the branchlete^?^s. 



Sabitat. Bute. Once found by Dr. Greville. 



Fig. 274. CALLITHAMNION GEACILLIMUM. 



Colour. When quite recent, a deep red; becoming rose-red in fresh water; giving out 



its colour if soaked too long. 

 Substance. Extremely soft and delicate. 



Character of Frond. Tufts of extremely fine, jointed threads [filaments) ; profusely 

 branched. Stems dividing into numerous long, wavy, irregular main branches. 

 Branches set throughout their whole length with a second similar set ; these with 

 compound branchlets; the upper ones beautifully plumed and re-plumed, with 

 one, two, or even three sets of gradually diminishing branchlet^^^^s; the lower 

 shorter, less regular, and less compound. The whole branching at one level as 

 if cut out (distichous). Outline of the principal branches broadly egg-shaped, of 

 the upper branchlets long, narrow, lanceolate, pointed, strongly resembling 

 minute fern -leaves. 



Joints. Visible throughout. 



Measurement. From 1 to 4 inches long. 



Fructification. Of two kinds. 1. Minute spores in roundish double capsules; sessile on 

 the principal branches. 2. Minute oval tetraspores on the tips of the (then) 

 shortened hmnaMQteens. 



Habitat, South and West of England. (Torquay, Milford Haven, Falmouth, Ply- 

 mouth.) On mud-covered perpendicular rocks and piers near low-water mark. 

 Rare. 

 43 



