90 
L AMIN ARI ACE M.~ Laminaria. 
iv. 
1. Cost aria Turner i, Grev. ; stipes flat, expanding into a linear-lanceolate five- 
ribbed lamina. J. Ag. Sp. Alg. vol. 1, p. 139- Kutz. Sp. Alg. 580. Fucus costatus, 
Turn. Hist. t. 226. 
Hab. On tlie North West Coast, Mr. Menzies. 
“ Frond solitary, rising with a stipe about an inch in length, marked from top to 
bottom with prominent, nearly parallel striae, cylindrical, and of the size of a 
crow’s quill at its origin, but almost immediately becoming compressed, and soon 
after flat, gradually expanding, too, as it rises, but so slowly that at the top it is 
scarcely above a line in diameter ; it here suddenly expands into a single, flat, 
undivided leaf, a foot and a half or more long, nearly linear, about two inches 
wide, quite entire, and slightly waved at the margin, at the base attenuated ; the 
surface marked all over with irregular transverse wrinkles, and having five parallel 
ribs running through it from top to bottom. Colour a pale, dirty yellow in the 
stipe, in the leaf olive-brown, and semi-transparent. Substance of the stem woody, 
of the leaf membranaceous.” — Turn. Hist. 4, p. 72. 
2. Co st ari a Mertensii , J. Ag. ; “ stipes flat, expanding into a cordato-ovate five- 
ribbed lamina.” — J. Ag. Sp. Alg. 1, p. 142. Costaria Turner i, Post, and Bupr. t. 24. 
Hab. North West Coast, Dr. IT. Mertens. 
I think this must be merely a broad leaved form of the last. 
VI. LAMINARIA, Lamour. 
Frond stipitate, coriaceous or membranaceous, flat, ribless, undivided or irregu- 
larly cleft. Fructification , cloud-like patches of spores , imbedded in the thickened 
surface of some part of the leafy expansion. 
The plants commonly known as Oarweed, Tangle, Devil's Apron , Riband-weed , 
Sole-leather -help, dfc. belong to this genus, which is more numerous in species, and 
possessed of a wider geographical range than any other of the Order. With the 
exception of L. Fascia, which is only a few inches long, they are all plants of a large 
size, varying from three to twelve, or twenty feet in length. They commence to 
grow about low-water mark, and descend, beyond that limit, to the depth of five 
to ten fathoms. 
Many are perennial ; the stipe remaining from year to year and the frond falling 
away. The new frond is developed between the ajiex of the stipe and the base of 
the old frond, and at first appears like a flattening and widening of the apex of the 
