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Fl.celLaph. 2.THALASSIOPHYT^. 75.Halidrys. 391
L. 75. HALIDRYS. Lyngbye. Sea-oah.
Thallus compressed, confluent, forked, ribless ; vesicles 0,
or innate; holdfasts shieldlike; sporidia intermixed with
jointed fibres in roundish thecee immersed in pedicelled,
lateral apothecia.
1. Halidrys nodosa. Knolbed sea-oak.
Thallus pinnately branched.
Fucus maritimus nodosus, Raii Syn. 48,41.
Fuciis nodosus, Lin. S. P. 1628; Engl. Bot. 370; Turn. Hist. 91.
Halidrys nodosa, Lyngbye Hydr. Dan. 37.
Sea-shore; perennial; winter.
Thallus 3 or 4 feet long, flat; apothecia roundish, mostly
solitary.
(3. minor, ylpothecia ovate, hardly wider than the pe-
duncle.
7. siliquatus. Apothecia linear, lanceolate.
2. Halidrys canaJiculata. Channelled sea-oak.
Thallus compressed, ribless, linear, grooved on one side,
level-topped; edge not cut; tip 2-cut; apothecia oblong,
2-cut, turned.
Fucus pumilus dichotomus, scgmentis ex una parte gibbosis, ex altera
excavatis, Raii Syn. 43, 12.
Fucus canaliculatus, Linn. Syst. Nat. T 16; Engl. Bot. 823; Turn. Hist. 3.
Fucus excisus, Lin. S. P. 1627,
Fucus rotundus, Esper, 17.
Sea-shore; perennial.
Thalli aggregate, 2 to 4 inches long.
3. Halidrys Mackaii. Mackay's sea-oak.
Thallus leatherlike, cylindrical, threadlike, forked, leveltopped
; tips blunt; vehicles scattered, innate, elliptical,
solitary, wider than the thallus.
Fucus Mackaii, Turn. Hist. 52; Engl. Bot. 1927,
Sea-shore; perennial; winter.
Thallus 6 to 12 inches high, lower part compressed;
angles of the fork roundish.
LI. 71. MACKAIA. Mackay.
Thallus cartilaginous, rod-like, shrubby ; upper part
branched, narrow, roundish compressed, below compressed,
broad, leaflike; holdfasts shieldlike; vesicles 0, or innate
in the branches; sporidia in roundish thecse intermixed
with jointed fibres, or in terminal apothecia.