Fig. 227. CRUORIA PELLITA. 
Colour. Blood-red. 
Substance. Gelatinous ; leathery. 
Character of Frond. Skin-like ; closely adhering ; forming smooth, glossy patches on the 
surface of smooth rocks. Outline at first circular ; afterwards irregular. 
Measurement. Indefinite, up to 2 inches in diameter. 
Fructification. Only one kind known. Tetraspores immersed ; lying at the base of the 
filaments of which the frond is composed. 
Habitat. Our shores generally. On smooth exposed rocks and stones, between tide-marks. 
Common. 
Fig. 228. PHYLLOPHORA PALMETTOIDES. ' 
Colour. Rosy-pink. 
Substance. Membranaceous ; the stems elastic. 
Character of Frond. Flat ; ribless ; narrow-oblong or wedge-shaped ; leafy ; expanding from 
a cylindrical, simple or branched stem. Leaves simple or once-forked ; the first 
always wedge-shaped ; bearing leaflets from their surface or tips. 
Measurement. From | an inch to 2 inches long. 
Fructification. Only one kind observed. Tetraspores forming large oval groups (sori) ; lying 
across the frond near the tips ; immersed in the substance. 
Habitat. South coast of England. On rocks near low-water mark. Rare. 
For other Phyllophoras see Plate XLV. 
Fig. 229. CROUANIA ATTENUATA. 
Colour. Brownish or purplish-red, fading to a dusty pink. 
Substance. Gelatinous. 
Character of Frond. Slender ; thread-like {filamentous) ; jointed ; much branched. Main 
divisions partly forked {dichotomous) ; branches alternate ; more or less re-branched ; 
the joints clothed all round {whorled) with very short, delicate, many-times-divided 
branchleteeTis {ramelli). 
Measurement. One or 2 inches long. 
Fructification. Only one kind observed in England. Large oval tetraspores in transparent 
cells ; seated on the whorled branchlets, either in pairs, or all round. 
Habitat. South coast of England. Parasitical on the smaller algae. Very rare. 
100 
