ling on Callithamnion Hookeri, which is shown in fig. 421. The basal part was | 
disc-shaped, as in the adult plant, but it was only developed on one side. 
Rhodomela subfusca is widely distributed in the Danish waters, growing on | 
stones and various Algæ (Fucus, Laminaria). It usually descends only to a depth | 
of 20 meters, but it has been found once in the North Sea in 31 meters’ depth | 
(Jydske Rev, f. «), and f. tenuior has been repeatedly recorded in depths from 25 | 
to 38 meters near Bornholm. The forma « occurs from low-water | 
mark to a depth of about 15 m or a little more, but it is most 
typical near low-water mark. F. lycopodioides has only been met 
with rarely in the Skagerak, washed ashore or by dredging in slight 
depths near land. F. virgata has been met with in all the waters | 
within Skagen in depths from 4 to 20 meters, most typical in the 
Belts. F. tenuior has been found in the Baltic Sea and particularly 
round Bornholm, in depths from 8,5 to 38 meters. F. abyssicola 
has only been met with once in the Little Belt in 22 meters’ depth. | 
— The vegetative development begins in winter (January) and is | 
usually arrested in May or June whereupon the trichoblasts and 
fertile shoots are shed. The organs of fructification begin to develop 
in winter and the spores are evacuated in spring. 
Localities. Ns: a: Jydske Rev 31 m and some other loc. off Lodbjerg | 
light-house and off Orhage, very sparsely. 8: washed ashore by Klitmøller (Hor- | 
fl 
| 
nemann). — Sk: Several places from Hanstholm to Hirshals, from low-water 
mark (Hirshals) to 15 m, mostly «, more or less approaching to ß, Iycopodioides | 
at Bragerne, Løkken and Hirshals. — Lf: Several places from Rennen by Lem | 
N Vig to Løgstør Bredning, but not well developed, usually intermediary between & | 
Fig. 421. . 4 2 : | 
and ?, virgata. — Kattegat: « very common, y very common, also in the Isefjord; 
Rhodomela subfusca. 2 M > 5 à | 
Plantlet growing on here also f. tenuior. — Sa: & and £ very common down to 17 meters’ depth. — | 
Callithamnion Hoo- Lb: @ and in particular y very common, « from low-water mark to 15 m, y from | 
keri. 210:1. 7—30 m; €, abyssicola: dQ, south of Lyø, 22 m. — Sf: «, y. — Sb: «: LK, Ele- | 
fantgrund; Kerteminde; GY, south of Sprogø; NN, 19 m. y: in numerous places, I 
5—19 m. — Sm: y in numerous places 4—12 m. — Su: «, off Aalsgaarde, Charlottenlund. y, in several | 
places, 5—10,5 m. — Bw: «, UP off Kramnisse Gab 8,5 m; KU, Schonheyders Pulle 7,5 m; KR, near | 
Korselitze Grund. y several places 7—20 m.— Bm: «, HG, Prestebjergs Rev. y, several places from 7 
to 20,5 m. d SD, north-east of Moen, 23,5 m, loose. — Bb: The species is common at Bornholm in 
depths from 5,5 to 25 m, but descending to 40 meters’ depth, more rarely near low-water mark, e. g. 
at Ronne (!) and at Ro (C. A. J.) in 1—2 meters’ depth. Some specimens have been referred to f. genu- 
ina; their stem was provided with cortex. These specimens were found near land in 1—10 meters’ 
depth. But also in great depth specimens were found which, though small and slender, most resembled 
f. genuina (Dana St. 3116, 5,5 miles N.N.E.1/. W. of Hammershus light-house, 35—40 m, C. A. J.); their 
stem had a well developed cortex. Most of the specimens from the waters around Bornholm may be 
referred to f. tenuis though they not rarely approach to f. genuina or to f. virgata. They are rather 
small; their height does not usually exceed 15 cm and the shoots are slender. The awl-shaped branch- I 
lets emphasised by SvepeErıius as characteristic to f. fenuior are not always present; in other cases | 
they are very numerous. A small-celled cortex is wanting as in SVEDELIUS’ specimens. On all sides 
of Bornholm. 
