Fuci. 
—_——— 
Method of 
Walker, 
“é 
nata, inarticulata. Fr. Vesicule rotundate solide ter- 
minales.” It is likewise divided into two sections ; 
with’ air-bladders as F. siliquosus (Turn. t. 159); and 
without air-bladders, as F. pinnatifidus, ‘(t. 20.) 
8d, Bombycina or Silkweed: “ Cartilaginea abulla, 
inarticulata, ramis filaientosis. Fr, Vesicule globose, 
solide, ramis solidis.” This includes Conferva scoparia, 
C. tomentosa, and similar plants. 
4th, Annularia or Ringweed :' “ Cartilaginea | annu- 
lata, ramis filamentosis. Fr. Tubercule globose solide 
terminales.” This is subdivided into several sections, 
and embraces a number of Conferve, ‘as C. fucoides and 
nnata of Hudson. ‘in 
5th, Nodularia or Knob-weed: * Herbacea, viridia, 
ramis ‘alternis, capillaceis, nodosis. Fr. Tubercula ra- 
mos “per intervalla occupantia.” This is divided into 
sections, with simple filiform fronds, as Conferva pli- 
eata of Hudson, and with filiform fronds much branched, 
as C. glomerata. 
6th, Catenaria or Chain-weed : ** Gelatinosa, ramosa, 
articulata ; articulis tumidis.”* The fructification was 
unknown to the author. The genus ‘was’ divided into 
several’ sections, with verticillate, Opposite; ' dichoto- 
mous,’ and alternate branches, and included Ulva arti- 
ealata of Hudson, Conferva corallinoides of Linnzus, 
and similar plants. 
7th, Fucus or Wrack: “ Coriaceiis, dichotomus, cos- 
tatus. Fr. Vesicule terminales, intus gelatinose, tu- 
berculis seminalibus rotundis.” This is divided’ into 
sections ; with air-bladders, as F. vesiculosus ; without 
air-bladders, as F. serratus, (Turn. t..90.) ; and with © 
inflated fronds, as F. inflatus of Linneus, now ascer- 
tained to be a variety only of F. vesiculosus. 
8th, Platyceros : “ Palmatus, dichotomus, enervius. 
Fr. Vesicule superficiales, sessiles, sparse, subglobose.” 
This is subdivided into leathery, membranaceous, and 
gelatinous, and, according to Dr Walker, embraces F. 
ceranoides and lacerus of Linnews. “+ 
9th, Phasganon or Tangle: “ Stipitatum, monophyl- 
jum, coriaceum. . Fr. Vesicule  supérficiales ‘globose, 
gelatinose, inter corticem et epidermidem folii tumide.” 
This is subdivided into two sections; those which are 
nerveless or destitute of a midrib, and those which have 
a midrib. The former section ineludes Ph. balteiforme, 
or Sea-belt of Dr Walker, (F?'saecharinus, Lin.) ; Ph. 
Marie or St Mary’s’ thistle; ‘Walk. (F. polyschides, 
Lightf.); and Ph. esculentum,’ or Common tang, Walk. 
(F. digitatus, Lin.) The latter section includes Ph. 
Scoticum, Walk. or F. esculentus, Lin. 
10th, Ulva, or Laver: “ Sessilis, monephylla, mem- 
branacea, enervia. Fr. Tubercula intra membranas, 
Lin.” There are three sections, by means of which 
plants very widely different are brought together: 
1.) Frondescent, including U. umbilicalis, or slake ; 
2) completely tubular, such as the common U, com- 
pressa ; and (3.) tubular, divided by septe, embracing 
B, ert of Linneus, afterwards described (Turn. t. 
86). : 
lith, Chartacea, or Dilse: * Sessilis, monophylla, 
enervia, palmata, laciniata.”’ The fructification was un- 
known to Dr Walker, | There are two sections; mem- 
branaceous and tn age The first includes the com- 
mon dilse; F. palmatus ( Turn: t. 115.), with F. proli- 
fer, (Lightf: t. 30.) and others the second,’ F. gelati- 
nosis of Hudson, the Sea’ ragged’ staff of. Pallas, 353. 
It may be- observed, that- Fucus Sarniensis of Roth, 
(Turn. t. 4%.) was’ known to Dr Walker by the name 
of Chartacea diehotoma. 
12th, Plumarium, or Feather-weed:  Stipitatum, 
cartilagineum, inarticulatim,ramosum, pennatum ; 
FUCI. 
fronde composita. Fr. Globuli laterales sessiles.” This 
genus is divided into several sections, being’ cartilagi- 
nous or membranaceous, and possessing or wanting a 
midrib ; and incluéss F. plumosus, ( Turn. t. 60. ) den- 
tatus, (t, 13.) and others. agpRanntennie = 6 ee 
“13th, Newrophyllum, or Nerve-weed : “ ‘Stipitatum, 
rarhosum ;' foliis membranaceis distinctis. Fr. Tuber- 
cula globosa pedunculata, superficie foliorum.” — F. 
sanguineus is a good example of this genus, (Turn. t. 
36. , . 
7 ae is the last genus of Dr Walker; and he di- 
vides sponges into sessile and branched ; but it is now 
generally admitted that they belong to the animal, and 
not to the vegetable kingdom. : 
Mr Stackhouse’s Method. 
Mr Stackhouse published his arrangement, in his 
Nereis Britannica, about the year 1797. He formed 
six genera: Fucus, Palmaria, Chondrus, : 
Corda, arid Codiim; the characters of which are take1 
chiefly from ‘the’ fructification, ‘but partly from ‘struc. 
ture. ; ye y - rT een f 
pe ruc hb tate Beale character: * Fructification 
a jelly-like mass, with imbedded seed-bearing granules, 
and external conical papille, terminating.” This genus 
is divided into two sections ; with the fruit ¢ |, as 
F. serratus and vesiculosus ; or innate, as F, loreus, 
( Turn, t..196.) met 
lossy, polished on 
2. Palmaria. Skin’ smooth, gl 
each side, with a colourless mucus within ; forming to- 
gether a thick consistent’ substance, with the seeds very 
minute, naked; orbicular, of the colour of the skin of 
the plant, disposed in patches or in lines, just within 
the surface of the cuticle,” This includes F. digitatus, 
(Turn, t. 162.) and edulis, (114.0 
"3. Chondrus. © Pructifieation an ovate Hpi imbed- 
ded pericarp, containing seeds ina clear mucus, and 
prominent on either surface.” "This enibracés only one 
species, F. crispus, and its numerous varieties. (Turn. 
t. 216, 217.) a 
4. Spherococcus.  Fructification, external globular 
pericarps, adnate or immersed 5» e or pedunculate ; 
containing seeds as in the others.” ‘This genus is sub- 
‘divided into several sections; with distinct leaves, as 
F. sanguineus; with a midrib, as F. alatus, (Turn. t. 
160.) ; with a compressed frond, as F. coccineus ; or a 
round frond, as F. rotundus. ~ 
5. Chorda. “ Fructification a mucous fluid in the 
hollow part of a cylindrical frond, with naked seeds af- 
fixed inwardly.” The principal example of this genus 
is F. filum. 
6. Codium. ‘ “ Fructification invisible to the naked 
eye; frond roundish ; soft and spongy when wet; vel- 
vety when dry.” This embraces only the sponge-like 
fuei, particularly F. tomentosus, a fine downy or spon, 
set, 
sea-weed found on the south-west shores of E 
(Turn. t. 135.) 
Mr Stackhouse expresses his conviction, that his ge« 
nera Fucus and Spherococcus will soon fall to be furs 
ther divided into several new genera; and he mentions 
some species having anomalous fructification, particu- 
larly F. ligulatus, (F%. Scot. t. 29.) and lycopodiodes, 
(urn. t. 12.) to which he had not been able to give a 
place in his arrangement. 
Dr Roth's Method. 
es, ' oye Method of 
Dr Roth, in his Catalecta Botanica, and in his Re- Roth, 
tt 
4 
