Ser. MelanospebmejE. I'am. Lammarie/B.
P la t e CCXLI.
LAMINARIA BULBOSA, Lamom.
G e n . C h a e . Ei'oni stipitate, coriaceous or membranaceous, flat, undivided
or irregularly cleft, ribless. Fructification; cloudy spots of spores,
imbedded in the thickened surface of some part of the frond. L am in
a b i a [Lamou/r),—from lamma, a th in plate, in allusion to the flat
frond.
L am in a b ia lulhosa; stem flat, with a waved margin, once twisted at the
base, rising from a roundish, hoUow, warted tu b e r ; frond oblong,
deeply cleft into many linear segments.
L am in a b ia bulbosa, Lamour. Ess. p. 32. Ag. 8yn. p. 18. Lyngb. Eyd. Ban.
p. 21. Hook. El. Scot. part 2. p. 99. Ag. Syst. p. 271. Ag. Sp. Alg.
vol. i. p. 114. Grev. Alg. Brit. p. 29. Hook. Br. El. vol. ii. p. 271. Harv.
in Mack. El. H ii. part 3. p. 171. Harv. Man. p. 24. Wyatt, Alg. Banm.
no. 4.
L a m in a b ia B e lv is ii, Ag. Sp. Alg. v o l. i . p . I I B . Ag. Syst. p . 2 7 1 .
S a o o o b h iz a b u lb o s a . Be la Pyl. M. Ter. Neuv. p . 2 3 . J. Ag. Sp. Alg. v o l. i.
p. 137.
H a l ig b n ia b u lb o s a , Btie. Ess. p . 6 0 . Endl. Zrd. Swppl. p . 2 7 .
P h y c o c a s ta n um bulbosum, Kiitz. Phyc. Gen. p. 346.
PccTJS bulbosus, Huds. El. Angl. p. 579. lann. Trans, vol. ill. p. 153. Turn.
Syn. p. 313. Esper, Ic. 1 .123. E. Bot. 1 .1760. Turn. Hist. 1 .161.
F u c iJS p o ly s c h id e s , El. Scot. p. 9 3 6 . With. v o l. iv . p. 9 7 . Stack.
Ner. Brit. t. 4.
Fuous palmatus, Gmel. t. 30.
U l t a bulbosa, BO. El. Er. vol. ii. p. 16.
H ab. On rocks a t low-water mark, and to the depth of 1 0 -1 5 fathoms.
Perennial. Autumn. Abundant on the British shores.
Geogb. D is tb . Shores of Europe from Norway to Spain. Eerroe Islands.
Coast of Guinea, Pal. de Beamois.
De scb. Boot, in the young state of the plant, composed of several clasping
fibres, gradually perishing as the frond increases in size, and its place supplied
by a hollow tuber which originates at a higher point on the stem.
Stem at first slender and filiform, half a line in diameter and an inch in
height, with a small dilatation like a collar a little above its middle ; gradually
becoming broader and quite flat, tiU, in large specimens, it is four or
five feet long, and two or three inches wide, with the margin very much
waved and curled. In these full-grown specimens, the collarMke swelling
becomes dilated into a hollow tuber, from four inches to a foot in diameter,
rough with wart-like or cylindrical fibrous projections. The portion of the
stem below the tuber is either absorbed or perishes, and roots issue from
the lower surface of the tuber to supply the place of the original holdfast:
thus a new base is provided for the frond, Irond in young specimens
membranaceous, oblong, or ovate, undivided; when full-grown coriaceous,
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