Plate LIX. 
Fig. 272. CALLITHAMNION BORRERI. 
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 branchletee? 2 S ; the lowermost 
longest. Branchletee/is simple, or re-plumed near their tips : producing a round, 
blunted outline. 
Joints. Visible throughout. 
Measurement. From 1 to 3 inches long. 
Fructification. Of two kinds. 1. Minute in double ; smz'Ze near the tips of the 
branchlets. 2. Globose tetraspores; sessile on the inner sides of the branchleteews. 
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 branchletee77S, 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 long. 
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 branchleteews. 
Habitat, Bute. Once found by Dr. Greville. 
Fig. 274. CALLITHAMNION GRACILLIMUM. 
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 branchletee77S ; 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 ; sessile on the 
principal branches. 2. Minute oval tetraspores on the tips of the (then) shortened 
branchleteews. 
Habitat. South and West of England. (Torquay, Milford Haven, Falmouth, Plymouth.) 
On mud-covered perpendicular rocks and piers near low-water mark. Rare. 
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