96 CRYPTOGAMIA. ALGA®. ‘Fucus. E.' (1) Flat, ribless; 
- OPAKE, 
into several very long segments, broad at the base, tapering. to 
a point, sometimes forked without a mid-rib. ‘The substance 
of the plant is cartilaginous ; it is Sometimes 15 feet in extent; 
its colour greenish, changing to olive or to yellowish. Gmetin 
fac, 203. a Ot 190, lattes creel boqede 
From a large hollow bulb arises generally one, sometimes’ 2 
or even 3 compressed stalks, 4 inches or more’ wide, thick in 
the middle, thinner at the edges, where it is strangely furbelow- 
ed and contorted. ‘This stem, which is upwards of 2 feet long, 
suddenly expands into a very wide head, which divides into 
sword.shaped segments. Its substance is leather-like, totally 
free from veins or fibres; colour deep brown, and appearing as 
if varnished. The bulb sends out numerous strong horny roots 
which strike deep into the ooze, or lay hold of the stones in the 
larger crevices of the rocks. Stackhouse. Ner. Britax. The 
roots are conical, serpentine, and well represented in the fig. of 
Mr. Stackhouse. Great masses of these. roots are frequently 
thrown upon the shore, and Mr. Stackhouse informs me that 
the plant sometimes weighs 20 or 30 pounds, or more. The 
fructification, it is said, has not yet been observed, but there are 
many dots or globules’ dispersed through the whole of the fo- 
liage, within its substance. Since the above was written, Mr. 
Stackhouse informs me that he has found vesicles under. the sur- 
face containing reticulated jelly like those in the F. digitatus. 
__ F, bulbosus. Huds. 579. Rocks and stones in the sea; on 
the coast of Cornwall, frequent. P. Jan.—Dec. 
digita’tus. F, Without a mid-rib; hand-shaped; segments sword- 
shaped: stalk cylindrical, °F igs 
— Stackh. 2=FI; dan. 392—Gunn. i. 3. . 
Stem as thick as a walking stick. Linn. Stem cylindrical, 
compressed, { to 2 yards high. Gunner. Norv. i, 34. Itta- . 
pers pretty much towards the top, and then suddenly expands 
into a leaf of a foot or more in breadth. This leaf is divided 
into a number of segments, from 4 to 12, each of which is some- 
times a yard long, and tapers to.a point. The substance thick, 
leather-like, ribless, with a fructification of thin inflated pel- 
licles produced without order on the surface, containing a mu- 
cilaginous fluid, but without apparent granules. The plant 
when fresh has a rich brown yellow colour, and appears smooth 
and shining as if varnished. Srackuouse. Nereis Britannica. 
a ee Siig 
cr The pellicles are not on the surface, but imbedded. ‘They 
close together, are often confluent, or as it were quilted. 
‘The jelly they contain, under high magnifiers appears reticu- 
lated. Communicated by Mr. SrackHouse, since the publica- 
. 
