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dredgings have been made in the same part of the fjord in 1890, 1893 and 1899. 
In the Kattegat it was not observed till 1909, when it was met with in the neigh- 
bourhood ot Frederikshavn, although these waters were very carefully explored 
after 1889. It is therefore very probable that the species has immigrated into the Danish 
water about the year 1900, a supposition which is in accordance with the obser- 
vations of KyLiN on the west coast of Sweden (1916, p. 91), where Trailliella was 
found in three localities on the coast of Bohuslän in 1902—1906, while it was not 
met with by the earlier investigators, e. g. by STRÔMFELT who made large collections 
(of Spermothamnion) on the same coast in 1885—1887. At Helgoland it has also 
been recorded in later years (comp. Kuckuck, Zeitschr. f. Bot. 8 p. 135). In July 1907 
I found Trailliella intricata abundantly on various Algæ and Ascidia at Arendal on 
the south-eastern coast of Norway, and in July 1916 at Anuglen on the West coast 
of Norway, near Bergen. 
Trailliella intricata is almost always epiphytic, growing on various alge, e. g. 
Furcellaria, Corallina officinalis, Phyllophora etc. but it also grows on Mytilus, Tro- 
chus, Hydroids and on pebbles, from low-water mark to 28 meters depth. 
Localities. Ns: eA and eR, off Thyboron, 28 and 27 meters. — Sk: eY and eZ, east of Hanst- 
holm, 15—17 meters; 13 miles S.W. by W. Ur W. of Rubjerg Knude light-house, 14 meters, with tetra- 
spores, Oct. (C. A. Jorgensen); (2!/; miles N.E. by N. of Skagens reef light-ship, 90 meters, loose, C. A. J.) 
— Lf: Nissum Bredning: Harbour of Thyborøn; Ronnen near Lem Vig (1901); ZU, near the latter, 4 
meters; XV, N. of Ronnen (1901); off Hesdal, Kobberod; ZT, off Osterbol, 4m, abundantly on loose 
Furcellaria; ZV, 5 m: ZY, 4,5 m; XU, 4 m; Nissum Bredning 1908 (Th. Mortensen); Oddesund. XT, south 
side of Jegindo Tap, 5 m; Sallingsund, various places, abundantly; aT!, off Alsted, Mors, 5 m; Knuds- 
hoved, Fur; N. side of Fur; W. of Eierslev Ron, 7 m; off Feggeklit, 4m. — Kn: Harbour of Skagen; 
fE, E. side of Krageskov Rev, 7 m; various places at Hirsholm, c. 11 m (1909 H. E. P.); near Kolpen, 
4m (H.E. P.); Laurs Rev; harbour of Frederikshavn; E. of Nordre Ronner; ZA, Tonneberg Banke, 
12—18 m (1904); fG, 3 miles W. of Læso Trindels light-ship; various places near the same 11—21 m; 
61/; miles S.W. by W.1/: W. of Læsø Trindels light-ship, 15 m, abundantly, with tetraspores, October 
(C. A. J.) — Ke: ZE?, near Fladens light-ship, 15 m (1904); 1 mile W. by N. of Fladens light-ship, 17 m, 
abundantly, Octob.; 147/, miles S.S.E. of Anholt Knob, light-ship, 10 m (C. A. J.). — Km: 51/, miles 
N. by E. 3/, E. of østre Flak light-ship, 9m (C. A. J.). 
Callithamnion Lyngbye emend. 
Key to the Danish species of Callithamnion. 
1. All cells uninucleate. 
2. Branches generally biseriate; hairs wanting; heaps of paraspores on 
ihestıppenäsideyofsthegp innulse ee BØRNE SS FE RLENSSEEe C. Hookeri. 
2. Branches generally spirally arranged; no paraspores. 
SE van Torre Th als -255socccoocosbocosomcccecceoscouute C. Brodiei. 
3. Pinnulæ usually without terminal hairs. 
4. Main axes vigorous, corticated; cystocarps round ............... C. roseum. 
4. Main axes feeble, usually not corticated; cystocarps lobed ...... C. Furcellarie. 
1. The older cells contain several nuclei. 
2. Branching pseudodichotomous; pinnulæ blunt, usually with terminal 
ATES en N RI RER ne JE EVER C. corymbosum. 
2. Branches generally spirally arranged; pinnulæ pointed, never with hairs C. tetragonum. 
