f 
Fig. 154. JANIA RUBENS. 
Colour. Lilac when recent ; changing to pinky or brick-dust red ; fading to green or milk- 
white? 
Substance. Hard and stony, like coral ; but flexible at the joints. Exceedingly brittle, 
when dry. 
Character of Frond. Dense tufts of slender branches ; their tips trimmed to one level 
(^ fastigiate). Branching forked (^dichotomous). Branches erect or spreading ; gradually 
tapering upwards ; cylindrical ; jointed. Joints at the b^se very short ; the upper 
ones gradually longer. 
Measurement. From J to 1 or 2 inches high. 
Fructification. Only one kind known. Clustered strings of spores in urn-shaped capsules; 
external, the last joint of a branchlet being transformed into one ; generally with a 
very slender branchlet springing from each shoulder, like horns, or the feelers 
(gafntennm) of a butterfly. 
Habitat. Our coasts towards the south. Parasitieal on the smaller algse between tide-marks. 
Common. 
Fig. 155. JANIA CORNICULATA. 
Colour. As in Jania rubens. 
Substance. As in Jania rubens. 
Character of Frond. As in Jania rubens with respeet to general appearance and branching, 
but no further. In J. corniculata the joints of the principal branches are compressed 
and wedge-shaped, tapering to the base ; the shoulders sharp and prominent, and 
often prolonged into a pointed horn-like branchlet (not figured in the Plate). Last 
branchlets eylindrical ; joints of the principal branches from two to three times as 
long as broad ; of the last branehlets very short. 
Measurement. One or 2 inches high. 
Fructification. As in Jania rubens. 
Habitat. Southern shores of England and Ireland. Isle of Wight ; Jersey, &c. Parasitic 
on the lesser algie. Not uncommon. 
Fig. 156. MELOBESIA CALCAREA. 
Colour. When fresh, deep blood-red ; soon passing into brick-dust colour ; fading to milk- 
white. 
Substance. Hard, stony, and limy ; solid. 
Character of Frond. Loose, irregular-shaped lumps, very much branched ; like an old stunted 
tree in miniature. Main branches forked {dichotomous)^ two sometimes uniting in one 
as they grow {anastomising). Branchlets standing out in all directions ; simple ; 
forked ; or three-pronged. 
Measurement. From 1 to 2| inches high. 
Fructification. Only one kind known. Clustered strings of spores in round, but rather 
depressed capsules^ scattered about the frond. 
Habitat. South of England and west of Scotland and Ireland. On shingly or sandy shores 
in from five to fifteen fathoms’ water. 
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