The English flora - SeaweedAfrica

252 ALGiE.
8. Laminaria. Frond coriaceous (rarely membranaceous)
plane, expanded, without a midrib. Fructification; seeds or
granules forming dense sori or spots, and imbedded in the
thickened surface of some part of the frond. Grev.
Tribe IV. Sporochnide^e. Marine plants; of an olivaceous or
yellowish-green colour, (iiot changing to black in drying) ; ofa
cartilagineo-membranaceous substance, becoming flaccid almost
immediately on exposure to the air, in some cases, acquiring
under such circumstances, a verdigris-green colour, and then possessing
the property of rapidly decomposing other delicate Alga;
in contact with them. Frond with a scutate (rarely tomentose)
root, flat, compressed or cylindrical, with distichous (rarely irregidar)
branches, and bearing, in most species, at some period
of their growth, little pencil-like deciduous tufts offine greenfilaments.
Fructification ; so far as it is known, composed of club-
shaped, moniliform, radiating filaments, either forming sessile
warts, or arranged concentrically in little stalked, club-shaped
bodies, terminated by pencils of delicate fibres. Grev.
9. Desmarestia. Frond cartilaginous, plane or compressed,
distichously branched, while young furnished with marginal deciduous
tufts of fine green filaments, the branches set with marginal
spines. Grev.
10. Dichloria. Frond cylindrical, filiform, cartilaginous,
pinnated with opposite branches and becoming flaccid and of a
verdigris-green colour on exposure to the air. Fructification
unknown. Grev.
11. Sporochnus. Frond filiform, cylindrical or compressed,
cartilagineo-membranaceous. Fructification ; club-shaped, moniliform
filaments, radiating in scattered warts, or concentrical in
distinct (mostly clavate, stalked) receptacles, often terminated
by a deciduous tuft of filaments. Grev.
Tribe V. CHORDARiEiE. Marine plants, ofan olive-green colour,
becoming darker on exposure to the air, of a cartilaginous and
lubricous substance. Boot scutate. Frond continuous, cylin-
drical, filiform, composed of a solid cellular centre and a dense
exterior mass of concentricalfilaments. Fructification imper-
fectly known. Grev,
12. Chordaria. Frond filiform, cartilaginous, solid, con-
tinuous, composed exteriorly of a stratum of concentrical filaments.
Grev.
Tribe VI. DictyotevE. Marine plants, of an olive-green colour,
not changing on exposure to the air, of a membranaceous,
flexible Rarely cartilaginous) substance and reticulated struc-
ture. Root either naked and scutate or composed of a mass of