224 



especially on the upper part of them, hut 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 Ihe crusts show the same aspect as those of the branches 

 (ligs. 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 111 fig. 4). Slime-strings may also remain distinct after the im- 

 mersion. Conceptacles filled out by tissue pro- 

 duced from the bottom of the cavity frequently 

 occur (fig. 140 A). The sporangia are always 

 two-parted, 70—110/^ long, 39- 50// broad. 



As mentioned above, the var. colliciilosa 

 has only been found in two localities in the 

 Limfjord while a specimen found in a third 

 locality of the same fjord seems to belong to 

 the var. Granii. The specimens from the other 

 localities were all referred to this variety, which 

 is best developed in the eastern Kattegat where 

 it was found in most of the localities in rather 

 great quantities as branched specimens, partly 

 loose. In the inner water it occurs only in 

 the form of crustaceous specimens with short, 

 often densely placed wartlike processes. The 

 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 Samso waters in 9,5 — 19 m, in the Great Belt in 19 m and in the Sound in 34 

 meters' depth. Ripe sporangia have been found in April— May. 



I> o c a 1 i t i e s . 



var. colliciilosa. Lf: iioitli of Hoiinen hy Lcmvig (6874); Nissum Brediiing off Helligsa tile-kiln, 

 5,5 m (C. H. Osteiifeld). 



var. Granii. Lf: western Limfjord, on an oyster-bed, brought up by a diver; form with rather long 

 unbranched Ijranches. — Kii : 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; lA, Store Middelgrund (! and F. Bargesen). — Km: Lieso Rende, a crustaceous specimen with 

 scarce low papillje, on a piece of coal; ND, N.E. of I-'orntes. — Ks: HO, E. of Hessele; EO, 26,5 m; A, 

 S.E. of Hessela. — Sa : E. of Samso (C. Lofting); RE, off Sletterhage, 10 m; KM, E. of 0reflippen; PL, 

 Wulft's Flak; north side of Refsnajs, 19 m (C. H. Ostenfeld); MS, S. of Klophagen by Endelave. — Lb: 

 Middelfart. — SI): MO, S.W. of Refsnies (? young specimens); near Sprog0, 19 m (C. H. Ostenfeld). — 

 Su: 0retvisten (Jobs. Schmidt); on the beach hy Hornbtek (Mrs. M. F"ibiger), 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. 



B 



Fig. 140. 



I.itliothamiiioii glaciate var. (iranii. Transverse 

 sections ol brniiches with tetrasporangial concep- 

 lack's. Ill .4 an immersed conceptaclc filled out 

 })y tissue Ironi the bottom. US .I. 



5. Lithotliaiiiuiou iiorvegicum (Aresch.) Kjellman. 



Kjellman, N. Ish. algfl. p. 122 (93), pi. 5 fig. 9 — 10; Foslie, Remarks 1905, p. 65; Lemoine, Structure, 1911, 

 p. 108 fig. 11 and 48. 



