224 
especially on the upper part of them, but they may also occur in the crusts when 
these are much developed. They are slightly prominent, about 260—350 » in dia- 
meter. The conceptacles in the crusts show the same aspect as those of the branches 
(figs. 138, 140). By proportionally few countings I found 30—60 muciferous canals 
in the roof. The conceptacles are usually gradually overgrown and immersed in 
the tissue of the branch, and this is also the case with those of the crusts. In such 
immersed conceptacles the septa between the sporangia are frequently visible for 
some time (Plate III fig. 4). Slime-strings may also remain distinct after the im- 
mersion. Conceptacles filled out by tissue pro- 
war duced from the bottom of the cavity frequently 
À TJ f 
N Na occur (fig. 140 A). The sporangia are always 
S two-parted, 70—110 long, 39—50  broad. 
x SZ A As mentioned above, the var. colliculosa 
has only been found in two localities in the 
Limfjord while a specimen found in a third 
TOF Cin. locality of the same fjord seems to belong to 
sr UF Ber, the var. Granü. The specimens from the other 
Wo SY a WR localities were all referred to this variety, which 
ze & 2 is best developed in the eastern Kattegat where 
BE it was found in most of the localities in rather 
great quantities as branched specimens, partly 
Fig. 140. loose. In the inner water it occurs only in 
Lithothamnion glaciale var. Granii. Transverse thesfor f t . itl Hoan 
sections of branches with tetrasporangial concep: e form ol crustaceous specimens with short, 
tacles. In A an immersed conceptacle filled out often densely placed wartlike processes. The 
by tissue from the bottom. 65:1. E 5 
species has been found growing on stones, 
gravel and shells, in the Limfjord in 5,5 meters’ depth, in the Kattegat in 17—30 m, in 
the Samsø waters in 9,5—19 m, in the Great Belt in 19m and in the Sound in 34 
meters’ depth. Ripe sporangia have been found in April—May. 
Localities. 
var. colliculosa. Lf: north of Ronnen by Lemvig (6874); Nissum Bredning off Helligso tile-kiln, 
5,5 m (C. H. Ostenfeld). 
var. Granü. Lf: western Limfjord, on an oyster-bed, brought up by a diver; form with rather long 
unbranched branches. — Kn: FG, Herthas Flak; off Frederikshavn; TR, Trindelen. — Ke: IR and ZI, 
Groves Flak; IL and IQ, Fladen; IH and IK, Lille Middelgrund, in quantity, on pebbles and gravel and 
loose; IA, Store Middelgrund (! and F. Børgesen). — Km: Læsø Rende, a crustaceous specimen with 
scarce low papille, on a piece of coal; ND, N.E. of Fornæs. — Ks: HO, E. of Hesselo; EO, 26,5 m; A, 
S.E. of Hessele.’— Sa: E. of Samsø (C. Lofting); BE, off Sletterhage, 10 m; KM, E. of Oreflippen; PL, 
Wulffs Flak; north side of Refsnæs, 19 m (C. H. Ostenfeld); MS, S. of Klophagen by Endelave. — Lb: 
Middelfart. — Sb: MO, S.W. of Refsnæs (? young specimens); near Sprogø, 19 m (C. H. Ostenfeld). — 
Su: Oretvisten (Johs. Schmidt); on the beach by Hornbæk (Mrs. M. Fibiger), probably brought by fisher- 
men from the southern Kattegat; bM, 22,5 m, crusts up to 1,5 cm in diameter with small wartlike processes. 
5. Lithothamnion norvegicum (Aresch.) Kjellman. 
Kjellman, N. Ish. algfl. p. 122 (93), pl. 5 fig. 9—10; Foslie, Remarks 1905, p. 65; Lemoine, Structure, 1911, 
p. 108 fig. 11 and 48. 
