90. KJELLMAN, THE ALG# OF THE ARCTIC SEA. 
in the present acceptation of the name probably comprises several specifically distinct 
forms. Lamark’s description of L. fasciculatum Hist. Anim. 2, p. 203 is very summary. 
Nevertheless he mentions a character which does not accord with my species, namely, 
»ramis apice incrassatis, obtusis». The plant, delineated (Phyc. Brit. Plate 74) and 
described, under the name of Melobesia fasciculata, by Harvey, who quotes as synony- 
mous the Millepora fasciculata of LaMaRK, is obviously distinct from the one in question, 
as is easily seen on comparing Harvey’s figures with mine. Melobesia fasciculata HaRvEY 
is distinguished from L. soriferum mihi by its strongly developed »solid, central stony 
mass», and by its short branches that are »remarkably truncated at the tips, which 
are moreover depressed in the centre». L. fasciculatum Arescuouc (in J. G. Ae. 
Spec. Alg. 2, p. 522), with which Harvey's M. fasciculata is cited as synonymous, 
certainly coincides in several particulars with my species, but it differs from it by 
the frond being »cirea lapillum plerumque undique effusa» and by the branches being 
sometimes simple, sometimes compound, thickened upwards, with truncate tips. Even 
in very young specimens of ZL. soriferum the branches issuing from the centre are 
decompound. L. fasciculatum AremscuouG (Obs. Phyc. IL, p. 5) differs most essentially 
in development and ramification from L. soriferwm, and, as far as I can see, it com- 
prises both M. fasciculata Harvey and that species which I describe below under 
the name of L. glaciale. L. fasciculatum Soums-Lavupacu (Corall. Monogr.), with which 
name the author very hesitatingly designs a species occurring in the Mediterranean at 
Naples, can hardly be identical with Harvey’s M. fasciculata. In ramification and in 
the shape and arrangement of the conceptacles of the sporangia it agrees, in its most 
developed form, with ZL. soriferum, but it differs from this by the lower part of its 
frond spreading over stones in the form of a crust. But, on the other hand, I think 
it is possible or probable that the fragment from Iceland mentioned by the author 
belongs to L. soriferum. 
The species occurring in Bohuslan, called L. fasciculatum, agrees with M. fasci- 
culata Harvey and L. fasciculatum Argscuoue (Spec. Alg.) and through the form of the 
branches is distinctly known from the plant here described. Professor J. E. ArEscuoue, 
the well-known monographer of the Corallinee, has kindly allowed me to look over 
his collections of such plants. I have not found in these any species, to which L. 
soriferum could be considered to belong. Thus no other course was left me than to 
describe under a specific name this species, which is very abundant in the southern part 
of the Polar Sea. 
Hab. According to my own experience, the present species grows on sandy and 
shinely bottom in quiet bays or on protected coasts, in 10—15 fathoms water. Dead 
it is found at greater depths, and it is probably such specimens that Kirmn has 
brought up from the elitoral region (cf. Krenn, Nordl. Alg. p. 11). It is gre- 
garious, covering large spaces of the bottom in great masses, and serves as substra- 
tum for various smaller algw, such as Antithamnia, Rhodophyllis dichotoma, Derbesia 
marina a. o. I have found specimens with ripe sporangia in July and at the end of 
September. 
