Plate XII. 
Fig. 45. ASPEROCOCCUS TUENERI. 
Colour. Pale olive, when young ; olive-brown, in age. 
Substance. Thin ; delicately membranaceous ; semi-transparent. 
Character of Frond. Tubular ; inflated ; oblong ; obtuse at the tips ; suddenly contracted at 
base into a short stem. Contracted at intervals, as if tied in, sausage fashion ! 
Measurement. From 8 inches to many feet in length ; from J to 2 or 6 inches thick. 
Fructification. Dot-like clusters of seeds (spores) scattered over the surfaces of the frond. 
Habitat. Our coasts generally. On stones, and the larger algae, between tide-marks. 
Known from A. compressus by being inflated; from A. echinatus, by its more transparent 
delicate texture, constrictions, and greater inflation of frond. 
Fig. 46. ASPEROCOCCUS ECHINATUS. 
Colour. Yellowish-olive, tending to brown. 
Substance. Membranaceous, but coarse and sub-opaque. 
Character of Frond. Tubular ; narrow ; more or less tapering to the base ; obtuse, or 
somewhat tapering, at the tips (the plate does not give the obtuse form, which is 
nevertheless common). 
Measurement. From 2 inches to 2 feet long ; from a hog’s bristle to | an inch in diameter, 
i.e. thicTc. 
Fructification. Dot-like clusters of seeds (spores) scattered over the surface of the frond. 
Habitat. Our coasts generally. On rocks and algse between tide-marks. Common. 
The great variety of size in this plant is puzzling to young collectors. But even when not 
thicker than a hog's bristle (a curiously favourite measure with phycologists !), it is still 
tubular ; and like its relatives {congeners) , often full of sand ! 
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