■ W .K H a .e l eìj lifih. Uecv e .'.R n ih a zn & VRie-ve imp.
P l a t e CLVIII.
FUCUS NODOSUS, Z im .
G en . Ch a e . Frond linear, either flat, compressed, or cylindrical, diolioto-
mous (rarely pinnated), ooriaceons. Air-vessels, when present, innate,
simple. Receptacles either terminal or lateral, filled with mucus
traversed by a net-work of jomted fibres, pierced by numerous pores,
which communicate with immersed, spherical conceptacles, containing
parietal spores, or antheridia, or both. Fucus ( i .) ,—from fivKos, a
Fucus nodosus ; frond compressed, without distinct rib, leathery, subdichotomous
; branches strap-shaped, somewhat pinnated, attenuate at
base, remotely toothed, here and there swelling into oblong air-vessels ;
receptacles lateral, ovate, stalked, springing from the axils of the marginal
teeth.
FüCüs nodosus, L im . Sp. PI. p. 1638. M. Suec. p. 431. PI. Lapp. p. 366
lAgldf. FI. Scot. vol. ii. p. 918. Huds. FI. Ang. p. 584. With. vol. iv. p. 84
Stack. Ner. Brit. g. 36. i. 19. FI. B a n .t.1 4 6 . P. B o t.i. 619. Esper
p. 35. t. 7. and p. 118. t. 60. Gm. Hist. 1 .1. B. f. 1. Turn. Syn. p. 353
Turn. Hist. t. 91. Lamour. Ess. g. 19. Ag. Sp. Alg. Yol.i. g. 36. Ag. Syst
p. 375. Hook. FI. Scot. part. 2. p. 94. Grev. FI. Edin. p. 284. Spr. Syst
Veg. vol. iv. p. 316. Grev. Alg. Brit. p. 16, Hook. Br. El. vol. ii. p. 368
Wyatt, Alg. Lanm. no. 154. Harv. in Mack. El. Hib. part 3. p. 169
Harv. Man. p. 21. Endl. 3rd Suppl. p. 29.
H alideys nodosa, Lyngb. Hyd. Ban. p. 37. t. 8.
P hysocaulon nodosum, Kiitz. Phyc. Gen. p . 352.
OzoTHALLiA vulgaris, Dm. in An. Sc. Nat. 1845, p. 13.
H a b . Growing on sub-marine rocks and large boulder stones, from ordinary
high-water mark to half-tide level. Perennial. Winter and Spring.
Very common.
Geoge . D is t e , Atlantic shores of Em’ope and North America.
De sc e . Eoot a hard, conical disc, one or two inches in diameter. Fronds tufted,
from two to four or six feet in length, from a quarter to half au inch or more
in width, compressed, two-edged, thickened into an obscure rib in the
middle, especially in older parts, linear, once or twice forked at considerable
intervals, remotely toothed at the margin. From the axils of the teeth
spring lateral, distichous branches similar to the main frond, toothed and
again once or twice pinnated with smaller branches, which are either simple
and lanceolate or cuneate and forked ; or furnished, in place of branchlets,
with solitary or tufted receptacles. AU the divisions of the frond are very
much attenuated at base, and more or less acute at the apex. Vesicles one
to two inches long, oval-ohlong, formed at intervals in the principal stem
and branches ; rarely absent. Receptacles springing from the axils of the
marginal teeth, ovate, raised on slender stalks, from half an inch to upwards
of an inch in length, bright yeUow when ripe, two or more often issuing
.ill