Fig. 11. FUCUS CERANOIDES. 
Colour. A fine olive ; clear. Becoming darker, but not black, when dry. 
Suhstance. Much less leathery and tough than its relatives {congeners). Described as coriaceo- 
memhranaceous ; i. e. leathery thin-skin, or thin-skinned leather 1 
Character of Frond. Flat, with clearly marked line of midrib ; branched. Branching partially 
forked {suh -dichotomous). Side branches alternate, then diverging into several forkings. 
Width very variable. Margins smooth {entire). 
Measurement. From 1 to 2 feet long. 
Air-vessels. None : though a tendency to inflation in the axils of the upper forkings is 
often perceptible. 
Fructification. Minute seeds {spores) in special receptacles at the ends of the branches. 
Receptacles oval ; a couple often forming the last forking ; smaller than those of F. 
vesiculosus ; orange -coloured, slimy, tubercled, but not so coarsely as those of F. v. 
HaUtat. Our shores generally ; but not so common as the rest of the family. On rocks and 
stones between tide* marks ; chiefly in places where rivers or other fresh waters run 
into the sea. Occasionally even in brackish water. 
A very beautiful variety among the coarse Melanosperms, and an interesting plant to 
look for, from its not being so common as its brethren, and its greater refinement of appear- 
ance. It has been found thrown ashore at Filey. 
Fig. 12. FUGUS SERRATUS. 
Colour. A fine dark olive-green ; glossy ; retaining both its clearness and colour when dry. 
Substance. Tough, leathery. 
Character of Frond. Flat, midribbed, branched. ' Branching repeatedly forked {dichotomous). 
Width very variable. Margins always toothed like a saw {serrated)^ but more or less 
deeply so in different specimens. 
Measurement. From 2 to 6 feet long ; width very various. 
Air-vessels, None. 
Fructification. Minute seeds {spores) in special receptacles at the ends of the branches. 
Receptacles narrow-oval ; flattish ; not extending to the margins, which retain the 
notched {serrated) character of the rest of the frond. 
Habitat. Our rocky shores generally. At half-tide level ; very common. 
The notched margins of this plant make it very easy of detection. 
6 
