KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:o 5. 87 
differ, however, from it by being more robust, by the branches being very scanty in 
general and especially more regularly feathered, and by most of the branchlets pre- 
senting the appearance characteristic of the typical C. officinalis. From this, f. flevilis 
distinguishes itself by the greater slenderness and flexibility of all its parts, and by its 
irregular and profuse branching, in consequence of which the upper branches form 
dense bundles. At least upwards, in their upper portions, the branches are cylindrical, 
terminating not seldom in a kidney-shaped fastening-disc, that is convex on the upper 
side, plane on the under-side, and the upper cortical cells of which are isodiametrical, 
the lower ones parallelopipedical, arranged in rows radiating like a fan. On the coast 
of Bohuslin I have seen no form identical with this, although the plant is here very 
variable in appearance. It often grows here in such localities where on the coast of 
Norway I have found f. fleailis. In such a case, it often assumes an aspect differing 
from the typical one, becoming stunted, and irregularly but at the same time scantily 
branched. It accords with C. elongata Etiis in point of slenderness, but differs from 
it by its branching and by the joints being chiefly round. On the other hand, it ap- 
pears identical with that form of C. officinalis which Ruprecur in Alg. Och. p. 354 
reports from the coasts of Russian Lapland and of Cisuralian Samoyede-land, possibly 
also with the dwarfish form, richly and finely branched, observed by Macnus at Gle- 
sver near Bergen (Magnus Nordseef., p. 70). 
The form for which I have proposed the name of robusta, is in most respects 
the opposite of the preceding one. It differs from this as well as from the typical 
form by being larger in size and especially more robust and by having more irregular 
and scanty branches. The joints are round, cylindrical or slightly tun-shaped. The 
main axes and the secondary axes of the first order, those with branches as well as those 
without branches, are thickest at the middle, tapering towards the top as well as to- 
wards the base, but more strongly towards the base. The branches of the last order 
are, on the contrary, of equal thickness, and do not taper strongly towards the base, 
as in the typical C. officinalis. The color is more vividly rosy red than that of the 
principal form, and in preservation remains longer than in this. I have not found any 
reproductive organs. 
Perhaps this plant is more rightly to be regarded as a northern species of the 
genus. But as I know it myself but incompletely, and as such great authorities as 
Arescnoue (J. E. Ag. Spec. Alg. II p. 563) and Harvey (Phyce. Brit. t. 222) state that 
C. officinalis occurs in a number of different forms, it is possible that that one which I have 
called f. robusta, not having found it recognizably described in the literature, is only 
a form of the common Scandinavian species of Corallina. I have not seen it on the 
coasts of Sweden. 
Habitat. The species occurs, fastened to stones, rocks, or, more rarely, to alge, 
as species of Laminaria, most commonly in rock-pools in the litoral zone or at low- 
water mark, sometimes in 1—2 fathoms water, seldom at a greater depth. It grows 
generally scattered, or in small close groups, and prefers sheltered places. Of the form 
gracilis 1 have found specimens with tetrasporangia at the end of August. 
