F U C U S. 
92 
«rs. The fixth variety, is the of Mr. Hudfon. It 
cannot however be called a diftinfl fpecies ; for its form 
is the fame nearly as the firft, only fl is extremely twided. 
10. Fuciis canaliculatus, the channeled or furrowed fu- 
cus. The diftinguifhing charadler of this fucus, is a chan- 
nel or furrow, palling through every branch on one fide, in 
a longitudinal diredtion. The frond is from two to fix 
inchesin extent, and has a compadt coriaceous bafe, from 
whence feveral branches fuddenly originate; each one 
producing Items, in a dichotomous feries, which in their 
turn alfo are fubdivided, and frequently terminate with 
bifid fummits. The plant has in general a falligiate ap¬ 
pearance. The frudlification is fixed in the interior part 
of the fwollen fummit, confiding of tough eladic globular 
tubercles. In fome of thefe, when perfedlly mature, an 
appfearance like a pundture, clofely fitted to the perfora- 
tion in the furface of the frond, may fometimes be obferv- 
ed, which feems defigned to facilitate the difperfion of 
the feeds. Each tubercle contains feveral grains, eiiher 
more or lefs in number. Thefe latter, notwithdanding 
their minutenefs, vary, as to their form, which is fome- 
times more or lefs ovate. The colour of the grains is a 
bright chefnut i and on fome fhores, a light olive-green. 
The fucus, when fredi front, the fea, has a yellowidi hue, 
which afterwards turns to a black. A branch of this 
fpecies is given in the Fulica Plate, at fig. 3. 
11. Fucus obtufus, the obtufe fucus. The frond of this 
fucus is doubly-pinnate, and from three to five inches in 
length. The dents proceed from a compadt glutinous 
bafe, and are fubdivided into lateral branches, which 
produce a third feries, confiding of the obtufe fegments. 
The latter, as well as the branchlets on which they grow, 
become gradually contradted in length, as they approach 
the fummit of the frond : and they both feem to obferve 
rather an alternate or dichotomous mode of growth. This 
fucus frequently grows in a more fitriple date upon the 
edge of the Fucus filum, or on other platits. Thefrond 
only confids of a fmall fingle dem, an inch and half in 
length, with a few dichotomous lateral (hoots. In the 
more luxuriant plants, the (terns are as large as common 
packthread, and refemble ifinglafs in colour: but the 
cuticle, which furrounds the fecondary branches and the 
fegments, has a beautiful pink colour. The interior fub- 
dance of the plant is tender : and, when the fucus is 
fre(h, it has a kind of el.idicity. It may always be dif- 
tinguidied by the obtufe terminations of the fegments, 
and frequently by a powerful perfume which it imparts, 
not unlike that of violets. The frudtificaiion confids of 
oblong-ovate grains or feeds, fixed in the interior part of 
the fegments. In a date of maturity, they appear like 
minute opaque warts upon the furface. See a figure of 
this plant in the Fulica Plate, fig. 4. 
12. Fucus bracleatus, the thin-leaf fucus. See a figure 
of this in the Fulica Plate, fig. 5. 
13 Fucus finuofus. Stem round : leaves oblong, un. 
dulate, (inuate-pinnatifid, ciliate on the margin; fringe 
linear-lanceolate, comprefiTed, feminiferous. 
14. Fucus polypodioides. Stem roundidi, fiexuotts, 
branched ; leaves membranous, nervelefs, alternately pin¬ 
nate, obtufe entire. 
15. Fucus Koelreuteri. Membrano-cartilaginous: 
dem very diort, round, branched : fronds entire, linear; 
younger-ones warty, 
16. Fucus fanguineus. Stem round, branched : leaves 
petioled, fimple, elliptic, undulate, entire : tubercles pe- 
duncled, globular*, mucronate. 
17. Fucus volubilis. Frond flat, fpiral, perfoliate, re- 
pand toothed. 
18. Fucus venofus. Frond flat, oblong, painted with 
warty veins. 
19. Fucus contortus. Fronds flat, nervelefs, prolife¬ 
rous towards the top, a little twided at the axils, denti¬ 
culate on the margin, fontewhat undulate both fides. 
30 . Fucus rufeifolius. Stem branched, winged ; leaves 
oblong-oval, obtufe, flat, entire, proliferous with pellucid 
concatenate veins : tubercles globul.ir, ft-dile. 
21. Fucus hyplogoiTiim. Branched, winged: leaves 
linear-lanceolate, flat, entire, proliferous, with reticulate 
veins : tubercles globular, feflile. 
22. Fucus palmetta. Stem round fimple ; thetipsex- 
panded into nervelefs many-cleft leaves: fertile tubercles 
on the extreme legments. 
23. Fucasovalis. Frond filiform, a little comprelTed 
with uniform vague branches: leaves oval-oblong, flefliy, 
entire; upper ones crowded. 
24. Fucus lendigerus. Stem filiform, branched: leaves 
lanceolate, ferrate : veficles racemed, filiculous, tuber- 
cled. 
25. Fucus tenuiffimus. Frond filiform, much branch¬ 
ed ; branches alternate, capillary, acute: leaves taper¬ 
ing to botli ends, bearing ovate-oblong tubercles. 
26. Fucus dafypliyllus. Frond round, filiform, branch¬ 
ed ; branches nearly (imple : leaves cylindrical, tapering 
to the bafe, fcattered, proliferous. 
27. Fucus natans. Filiform, comprefled, pinnate: 
leaves oblong-lanceolate, ferrate : veficles globular, pe- 
duncled, fcattered, on fiat dilated peduncles. 
28. Fucus acinarius. Filiform, branched ; leaves li¬ 
near, very entire : veficles globular, peduncled. 
39. Fucus falicifolius. Stem fimple, flartith : leaves 
lance-linear, very entire; veficles globular, axillary, 
feflile. 
30. Fucus turbinatus. Filiform, (ligluly branched ; 
veficles racemed, one of them turbinate, peltate, with a 
heart-fhaped crenate leaf. 
31. Fucus bacciferus. Round, filiform, rigid, much 
branched : leaves linear-lanceolate, ferrate : veficles glo- 
bular, very numerous, on round peduncles. 
• 32. Fucus filiquofus. ComprefiTed, branched : leaves 
two-rowed, alternate, entire : veficles peduncled, oblong, 
hollow; pods lanceolate, folid. 
33. Fucus fiiiculofus. I'iliform.comprelTed : leaves 
alternate, nightly ferrate; veficles nearly globular, pe- 
duntled, mucronate. 
34. Fucus fubrepandiis. ComprefiTed; branches al- 
ternaie : leaves linear-lanceolate, fomewhat repand-toolh- 
ed : veficles peduncled. 
35. Fucus rofa marina. Round, flelhy, branched; 
leaves perfoliate, about three in a whorl, marked with a. 
ring in the middle. 
36. Fucus fpermophorus. Membranous, comprefiTed, 
forked, capillary: leaves linear, many-cleft: globules 
peduncled, lateral. 
37. Fucus abrotanifolius. Filiform, compreffed, doub¬ 
ly pinnate; extreme branchlets veficular: veficles innaie, 
elliptic, ending in many-parted tuberc.ed leaflets. 
38. Fnens dilcors. Round, branched: leaves linear- 
lanceolate, ferrate, alternately pinnatifid ; upper ones 
capillary, many-cleft ovate and tubercied at their tips. 
39. Fucus marginalis. Somew liat car.ilaginous : frond 
filiform, round, comprefiTed, much bratiched, befet on 
the lateral margin above with umbilicate tubercles. 
40. Fucus mufeiformis. Membranous, filiform, much 
branclied ; branches fetaceous ; margins of tlie ftem aiid 
branches ciliate. 
41. Fucus mucronatus. Round, much branched; 
branches filiform, fpinous, the extreme ones veficular; 
veficles innate, lanceolate, filiform, ending in a fimple 
tubercied point, 
42. Fucus barbatus. Round, much branched, unarm¬ 
ed ; branches filiform, tubercied at top : tubercles cluli. 
tered into an ovate enfpidate pod. 
43. Fucus felagnoides. Round, much branched j 
branches panicled, with alternate fubulate fomewhat te- 
traftichoiis fpines tubercied at the bafe ; upper ones 
clofely imbricate. 
44. Fucus tamarifcifolius. Round, much branched; 
branches filiform, fpinous, the extreme ones veficular : 
veficles 
