587 
of 2.5 mm, 7 mm and 2 cm, but smaller specimens, partly disc-shaped without any 
upright shoot, occurred with them. It must be concluded that the spores germi- 
nate in the middle and at the end of summer, and that the germlings or the 
majority of them remain small and feebly developed in autumn and grow out only 
in the following summer; but it seems quite probable that, under favourable external 
conditions, the earliest developed germlings may reach the stage of fructification 
in the same season in which they have arisen. 
Lomentaria clavellosa only occurs in the northern Danish waters with high 
salinity (North Sea, Skagerak, northern and eastern Kattegat) and has only once 
been met with, many years ago, in the Great Belt at a great depth. On the other 
hand it has not been met with in the Limfjord, undoubtedly owing to the varying 
temperature in this area. It grows at depths of 9 to 31 metres, deepest in the 
North Sea (24.5—31 m) and the Eastern Kattegat (14—26.5 m), on gravelly or 
sandy bottom with small stones or on stony bottom, very often atlached to various 
Algæ, e.g. Halidrys, Corallina offic., Polysiphonia spp. etc., further on dead leaves of 
Zostera, on various Hydroids, Flustra foliacea and shells of molluses. It has not been 
observed in winter and early spring and has probably a small size in this period. 
The specimens collected in May were only 2—3 cm high and sterile. The maximum 
of development is reached in July and August when the specimens may reach a 
length of up to 18 cm (Groves Flak) and are fructiferous, with ripe tetrasporangia 
and cystocarps at least after the middle of July. 
Localities. Ns: ZQ, jydske Rev, 24.5 m; aF N.W. of Thyboron, 31 m. — Sk: SY, north of 
Løkken, 13 m; ZK (0, 3, 7, 11) 8—19 m; various places N.W. of Hirtshals (YK, YL, XO ete.), 13—15 m, 
off Hirtshals (Borgesen). — Kn: Herthas Flak, 19—22.5 m; Tonneberg Banke, 16—19 m (Boye Peter- 
sen!); fG and dS near Læso Trindel, 15—16 m; Nordostrev and Norvestrev at Hirsholmene; south of 
Hirsholm, 11 m; Trestensrev (Henn. Petersen), N.E. of Deget 11.5—13 m (Stamm) and Borrebjergs and 
Laursrev, 7.5—11 m at Frederikshavn; VU, north of Læsø, 15 m; at Nordre Ronner, near the double 
broom, 11—14 m; TM, N.W. by N of Nordre Ronner, 15 m. — Ke: Fladens lightship in S by E, 1 mile, 
23 metres; EX and EV, Groves Flak. 26.5 and 22.5 m; Groves Flak 19 m (Borgesen); EU, Lille Middel- 
grund, 14 m. — Sb: According to Magnus (Botan. Unters. der Pommerania Exped. Kiel 1873, p. 66 and 
74) this species (Chrysymenia clavellosa J. Ag.) has been dredged in Store Belt W.S.W. of Romsø at 
51 metres’ (27 Faden) depth; it has not otherwise been met with in this water. 
2. Lomentaria rosea (Harv.) Thur. 
Thuret in Le Jolis, Liste des Alg. mar. de Cherbourg 1864, p. 131; Farlow, Mar. Alg. New England, 
1881, p. 155. 
Chrysymenia Orcadensis Harv., Manual Brit. Mar. Algæ. Sec. edition, London 1849, p. 100. 
Chrysymenia rosea Harv. var Orcadensis Harv. Phye. Brit. Vol. III, 1851, pl. 301. 
Chrysymenia rosea Harv. Phyc. Brit. III, pl. 358 A. 
Chylocladia rosea (Harv.) J. Agardh, Sp. g. o. Alg. III 1876, p. 298. 
This rare and imperfectly described species has only been met with once, in July 
1892 in the eastern Kattegat, at 22.5 metres’ depth. The two dried specimens 
75* 
