230 ADDENDA. 
perly be termed the bark of the stem ; but in L.stenophylla the stem is com- 
pressed or flattened, and is smooth at all stages of its growth, and entirely 
destitute of bark. In L. digitata, when the tide leaves the growing plants 
exposed, the stems stand up out of the water like hard curved sticks, but 
those of L. stenophylla are soft and pliable, and when the tide recedes 
entirely from them, the stems and long leathery fronds lie limp and flat 
upon the rocks where they grow. Again, as regards the manner in which 
the fronds of these species are digitated or cleft, there is a very marked 
difference. In L. digitata the laciniations commence very nearly at the 
base of the lamina, just where it expands above the stem ; and frequently 
as many as a dozen or more radiate from this point, often reaching a 
length of several feet without further division in any of them; but in 
L. stenophylla, the divisions are much less numerous, of far greater pro- 
portional length, and the secondary laciniations are more regular and also 
few in number, and very narrow as they approach the tips. The situations 
in which these plants grow are also very different, for, although L. digitata 
is found in pools often above half-tide level, its ordinary place of growth 
is below tide-marks and extending into deep water, while L. stenophylla 
vegetates within ordinary tides, and may be said to form a zone, as it 
were, between the larger Laminarie and the shore. 
To the Orkney kelp-gatherers, the differences between these two species 
are so marked, that peculiar local names are assigned to them, L. digitata 
being known as ‘‘Cuvy,’’ while L. stenophylla is always called “ Tangle.”’ 
In the north of Scotland a gigantic form of L. saccharina (Fig. 43) is 
met with, which, I am informed, Professor Agardh considers identical 
with L. caperata, a large species which is a native of Spitzbergen. The 
frond of this plant is nearly 2ft. wide, and very much curled and fringed 
at the margins. In conclusion, I may briefly refer to the large species, 
L. bulbosa (Fig. 48), which will henceforth be known as Sacchorhiza 
bulbosa, the bulbous or bag-rooted laminaria; a change of name which 
I consider highly appropriate, the large bulb or bag-like root of this 
curious species being fully as characteristic as the common name of “ sea- 
furbelows” is of the puckered or waved margins of its flattened stem. 
