6 
specimens that Chamisso had brought home. The Botanist 
will derive no more information respecting this interesting 
Fucus from Agardh's subsequent work, published three 
years after, in which he simply says, * Fucus Clathrus, lamina 
stipitata ecostata cribrosa spiraliter involuta." The ocean 
hardly boasts a more beautiful production than this: it is 
generaly about the height of a man, very bushy and 
branched, each branch bearing a broad leaf at its extremity, 
which unfolds spirally, and by this gradual development 
produces the stipes with its branches and lateral divisions. 
A spiral border, wound round the stipes, indicates the 
growth of the frond, The frond presents a large, convex, 
bent lamella, without nerves; or to a certain degree a leaf, 
of which one-half is wanting, for the stipes may be consi- 
dered as a central nerve. A number of rather long narrow 
perforations, arranged in a radiate form, give the frond the 
appearance of a cut fan; these foramina being coeval with 
the formation of the frond, and apparently not owing to 
inequalities of substance, as Turner thinks is the case in 
F. Agarum. At first, these foramina, which are situated 
near the stipes, and where the frond is bent in, are round, 
and have their margins turned outwards; but by the subse- 
quent growth of the frond, they become longer, and their 
margins disappear; in the middle of the frond they are like 
true clefts, but nearer the margins, from the greater deve- 
lopment of the leafy substance, they are more contracted in 
their breadth, and therefore seem round. The frond has a 
complete and entire margin, but is frequently torn; its sub- 
stance is coriaceous. I have never detected any fructifica- 
tion. The root resembles that of the larger Laminarias, but - 
is more woody. This Fucus is very plentiful in the Bay of 
Illulak, and round the whole island of Amaknak. It clothes 
the rocky shore, like a thick hedge, for a space of 60 or 
80 feet, forming, at a little distance, a very pleasing feature 
in the scenery. Its stalk is often adorned with the elegant 
Fucus asplenioides, which is nowhere found more luxuriant 
and perfect; in the Bay of Awatscha it is less numerous, 
smaller, and not so much ramified. 
