I M
P l a t e CCXXIII.
LAMINARIA DIGITATA, L a m m r .
G b n . C h a e . M o n i stipitate, coriaceous or membranaceous, flat, undivided
or irregularly cleft, ribless. Fructijication ; cloudy spots of spores,
imbedded in tbe thickened surface of some part of the frond. L a m i n
a e ia {Lamom.),— b om lamina, a thin plate, in allusion to the flat
frond.
T.amtnaeta digitata ; stem long, woody, cylindrical, gradually tapering
and somewhat compressed upwards, expanding into a leathery,
roundish-oblong frond, deeply cleft into many linear segments.
L a m in a e ia digitata, Lamour. Ess. p. 32. Lyngh. Hyd. Lan. p. 20. Ag. Sp.
Alg. vol. i. p. 112. Ag. Syst. p. 270. Grev. Alg. Brit. p. 37. Hook. Br. El. vol.
ii. p. 371. Harv. in, Mack. El. Hib. part 3. p. 171. Harv. Man. p. 23. Wyatt,
Alg. Lanm. No. 156. Endl. 3rd. Suppl. p. 37. Post, and Bvpr. t. 13. J. Ag.
Sp. Alg. vol. i. p. 134.
L a m in a e ia stenoloba. Le Lap. Terr. Neuv. p. 5B.
H a pg y g ia digitata, Kiitz. Phyc. Gen. p. 346. t. 30. and 31.
Fucu s digitatus, Linn. Mant. p. 134. El. Lan. t. 393. StaFk, Ner. Brit. p. 5. t.
3. Esper, p . 99. t. 48, 49. Huds. El. Angl. p. 579. Lightf. El. Scot. p. 935.
With. 4. p. 98. Unn. Trans. 3. p. 152. Turn. Syn. p. 207. Turn.Hist. 1 .162.
E. Bot. t. 2274.
Fucu s hyperboreus, Gunn. El. Norv. 1. p. 34. t. 3.
H a b . On rocks in the sea, beyond tbe reach of the tide, extending to the
depth of about fifteen fathoms. Perenmal. Winter. Abundant
on the shores of the British Islands.
G e o g e . D i s t e . The Icy sea, and Northern Atlantic, from Norway to Spain,
and from Greenland to the shores of Massachussetts {at least). Kamts-
chatka.
D e s c e . Boot, a conical mass composed of numerous, stout, branching fibres, each
of whose branches ends in a flattened disc which takes a strong hold of the
rocky bottom. Stem from two to six feet long, cylindrical, solid, in large
specimens upwards of an inch in diameter near the base, gradually tapering
up.wards and becoming compressed towards the summit, where it passes into
the base of the frond. Erond from one to five feet long, and from oue to
three feet in breadth, deeply cleft from the apex nearly to the base into an
uncertain number of linear, strap-shaped, acute or obtuse segments. Fructification
dark colom-ed, cloud-like patches, seen on old fronds, consisting
of a stratum of innumerable, minute, angular, dark-coloured spores, concealed
beneath the surface cells. Substance in the stem woody, but flexible, hard
and horny when dry ; in the frond, leathery. Structure cellular ; the cells
of the central portion of stem and frond very minute ; those of the periphery
larger ; in the frond quadrate, with spherical air-cells at intervals. Cohur,
a fine clear oKve, becoming darker in age.
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