Plate LVIII. 
Fig. 266. CALLITHAMNION TUENERI. 
Colour. A fine rose-red. 
Substance. Soft but firm. 
Character of Frond. Dense round tufts of jointed threads {filaments) rising from creeping 
fibres ; branched. Stems upright ; simple or slightly branched ; once or twice 
plumed like a feather {pinnate).^ with short opposite branchlets (see magnified bit), 
very regularly arranged ; the lowermost rather the longest, gradually diminishing 
upwards. 
Joints. Visible throughout. 
Measurement. From an inch to IJ long. 
Fructification. Of two kinds. 1. Minute spores in stalked, oval capsules^ borne on the 
branchlets enfolded by branchleteews {involucrated). 2. Globose tetraspores^ either 
stalked or sessile, clustered or solitary, on the inner sides of the branchlets. 
Habitat. Our coasts generally. Parasitic on several algse between tide-marks. Common. 
Fig. 267. CALLITHAMNION PLUMA. 
Colour. Crimson. 
Substance. Soft. 
Character of Frond. Dense, very short tufts of jointed threads {filaments) rising from creeping 
fibres ; sparingly branched. Stems upright ; simple or slightly branched. Branches 
naked below, the upper half plumed like a feather, with short or long, very upright, 
close-set branchlets. 
Joints. Visible throughout. 
Measurement. One-quarter to | an inch high. 
Fructification. Only one kind observed. Globose tetraspores, stalked or sessile ; clustered or 
solitary ; often at the tips of the branchlets. 
Habitat. The warm stations on our coasts. Jersey. Miltown Malbay. Bantry Bay, &c. 
Parasitic on other algfe ; generally on the stems of Laminaria digitata. Bare. 
Fig. 268. CALLITHAMNION HOOKERI. 
Colour. A brownish or rosy-red ; the two tints often found on the same specimen. 
Substance. Soft. 
Character of Frond. Thread-like {filamentous) ; jointed ; single or tufted. Stem as thick as 
a hog’s bristle ; closely furnished throughout with long, alternate, simple branches, 
which again bear a second or third set ; sometimes springing from all sides of the 
stem ; all set with very wide-spread branchlets, plumed like feathers ; these re- 
branchleted with a second very short horizontal set. 
Joints. Distinct only in the lesser branches and the branchlets. 
Measurement. From 1 to 3 inches long. 
Fructification. Of two kinds. 1. Minute spores in large oval capsules; sessile here and there 
on the branches. 2. Globose tetraspores ; sessile along the inner sides of the branch- 
lets near the base ; either single or two or three together. 
Habitat. Our coasts generally. On rocks and algae between tide-marks. Not uncommon. 
A rather woollj- variety of this variable plant was once considered a separate species ; C. lanosum. 
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