445 
Thus in the North Sea it has only been found from low-water mark to 13 meters’ 
depth, although several dredgings have been made in localities in deeper water. 
Further it was wanting in all the dredgings on Herthas Flak in the Northern Katte- 
gat (19—22,5 meters), and in almost all the numerous dredgings made in the Eastern 
Kattegat. The species reaches a length of at least 20 cm; the largest specimens 
collected were 30 cm (Skagerak) and 35 cm (Lille Belt) long. 
Localities. As the species is very common in shallow water, only localities deeper than 15 
meters are recorded. In these specimens the joints were thrice as long as broad in the middlemost part 
of the frond. — Ns: From Esbjerg to Hanstholm, down to 13 m. — Sk: Down to 13 m. — Lf: — 
Kn: IX, near Trindelen, 19 m; YX, east of Nordest-Rev, Hirsholm, 23—28 m. — Ke: Only in IN, 
Fladen, 15 m; EX, Groves Flak, 26,5 m; ET, Lille Middelgrund, 12 m; IA, Store Middelgrund, 16,5 m 
(f. reducta); GJ, Ostindiefarer Grund, 8,5 m and Soborghoved Grund, 8,5 m. — Ks: Hastens Grund, 16 m. 
— Sa: YV, 15m. — Lb: Rogle Klint S. by E. 19—30 m; between Strib and Nederballe, 35 —44 m; Fæno 
Sund, 28 m; dH!, east of Hesteskoen, 18—19 m (f. flaccida); dQ, south of Lyø, 22 m. — Sf: — Sb: 
eN, 18 m; Z, off Skagbo Huse, 19 m; AA, north of Nyborg, 22,5—26,5 m (f. reducta); NN, S.W. of Sprogø, 
19 m; US, Langelandsbelt 37,5—45 m (f. flaccida); LB, Langelandsbelt, 17 m.— Sm: — Su: bM, south of 
Hveen, 22,5 m (f. reducta). — Bw: KX, Femerbelt, deeper than 19 m. — Bm: VG, 17 m and QS, 20,5 m, 
North of Moens Klint. — Bb: SR, 15—16 m and ST, 18 m, Rønne Banke (f. reducta); YC, Salthammer 
Rev, 24,5 m. 
Brongniartella Bory. 
1. Brongniartella byssoides (Good. et Woodw.) Schmitz. 
Fr. Schmitz, Die Gattung Lophothalia. Ber. deut. bot. Ges. 11, 1893, p. 217; P. Falkenberg 1901, p. 542, 
Taf. 19 Fig. 8—10; Kolderup Rosenvinge, 1903, p. 469. 
Fucus byssoides Goodenough et Woodward, Trans. Linn. Soc. III 1797, p. 229. 
Hutchinsia byssoides C. Agardh, Synops. Alg. Scand. 1817, p. 60; Lyngbye, Tent. 1819, p. 110, Tab. 34 B, C; 
Flora Danica Tab. 1905,2, 1827. 
Polysiphonia byssoides Greville, Flora Edin. 1824, p. 309; Areschoug, Phyc. Scand. mar. 1850, p. 56; 
Harvey, Phye. Brit. III, 1851, Plate 284; J. Agardh, 1863, p. 1042; P. Magnus, Bot. Zeit. 1872, 
p- 253; L. Kny 1873, p. 106; G. Thuret et E. Bornet, Etudes phyc. 1878, p. 86; L. Kolderup Ro- 
senvinge, 1884, p. 25 (4), PI. 2 Fig. 30; Hauck Meeresalg. p. 238; Buffham, 1888, p. 263; Reinke, 
Algenflora 1889, p. 31. 
Polysiphonia Dillwynii Kützing, Phyc. gen. 1843, p. 430; Tab. phyc. 14, 1864, Tab. 23 (&). 
Polysiphonia vaga Kützing, Phye. gen. 1843, p. 431; Tab. phyc. 14, 1864, Tab. 24. 
Polysiphonia asperula Kütz., Spec. Alg., p. 835, Tab. phyc. 14, Tab. 25. 
Polysiphonia Lyngbyei Kützing, Phyc. gen. 1843, p. 431 (Hofmansgave). 
Polysiphonia Bangii Kützing, Spec. Alg. p. 1849, p. 835; Tab. phyc. 14, Tab. 25 (Hofman Bang). 
Lophothalia byssoides J. Agardh, Till Algernas Systematik, 6. Afdel. 1890, p, 59 (Lunds Univ. Ärsskr. 26). 
As first shown by Kny and confirmed by the writer and by FALKENBERG, the 
trichoblasts are arranged in a spiral turning to the left with an angle of divergence 
of ?/; or nearly so. In luxuriantly growing shoots, the upper end of the axis is 
straight and overreaches the young trichoblasts which are curved upwards but not 
appressed to the axis (comp. FALKENBERG |. c. fig. 8). The trichoblasts have usually 
not more than two branches (FALKENBERG p. 544) but three branches are not un- 
frequently met with (comp. KOLDERUP ROSENVINGE 1884 fig. 30). On the other hand 
D. K. D. Vidensk. Selsk. Skr., 7, Række, naturvidensk. og mathem. Afd. VII. 3. 57 
