si 
Localities. Ns: ZQ, jydske Rev, 24,5 meters; aF, 31m; XR, off @rhage; eT, 34 m; YT, off 
Helshage, Hanstholm, 5,5—13 m. — Sk: eX, N.W. of Bragerne, S.E. of Bragerne, 10,5 m; washed ashore 
at Svinklov; Dana St. 2900, 2899 (C. A. J.); several places off Lonstrup, 7,5—19 m; Bredegrund and 
Mollegrund off Hirshals; bF, Skagbanken. — Kn: Herthas Flak, e. 22 m; around Hirsholm; Frederiks- 
havn; VT and GN, near Nordre Ronner; VT; common at Læsø Trindel, 10—24 m. Ke: Fladen, 
several places, 16—30 m; Groves Flak; several places, 19—30 m; XA; RU, 26,5 m; Store Middelgrund 
(Borgesen, !); GJ, Ostindiefarer Grund; OO, Soborghoved Grund, 8,5 m; bR, Vesterlands Grund at 
Gilleleje, 7,5 m. — Km: Læsø Rende, Dana St. 2884 (C. A. J.); XC, south of Læsø, 7m. — Ks: Lyse- 
grund (Lyngbye, HQ, OP!); OT, Hastens Grund, 9,5 m; near Hesselo (Lyngbye); RL; D; GG, GF, 
Sjællands Rev; FP, Jessens Grund, 4m. — Sa: PA, GD. GE, PC, near Sejerø; PG, near Hatter Rev; 
Koldby Kaas, outer side of mole; aV; MP, DK, Bolsaxen; AH!, Lille Grund; Hofmansgave (Hofm. Bang); 
entrance to Odense Fjord (C. Rosenberg). — Lb: Middelfart; off Kongebro; Fano Sund, 19—34 m; off 
Stenderup; DA, off Bojgden; dH, dH’, east of Hesteskoen; CF, dQ, south of Lyø, 22 m; LG, off Vidso, 
Ærø. — Sf: BY, BX, Svendborgsund; UV, north of Ærø. — Sb: GT, off Asnæs; GU; LK, Elefantgrund; 
CN; NU; cL, 25—27 m, NO, NN, near Sprogø; GP; DN, Vengeance Grund; UE; UF; UG; LH, West 
Side of Langeland; UH; UT; DQ; US, c. 40 m; US!; DR; LB; UR. — Sm: HA, Agerso Sund; VC; HC; 
CR; KQ. — Su: Hellebæk; north of Kronborg cast ashore (Liebman, C. Rosenberg a. 0.); bM, south of 
Hveen, 22,5 m. — Bw: bV, N.E. of Kobbel Skov; cD, cE, dO, 5 m, south of Als; Pols Rev; DX, Vodrups 
Flak; UL, Ojet, 20 m; LA, UQ, KY, KV, KU, south of Lolland; KT, Gedser Rev; Kadetrenden, 24,5 m. 
— Bm: KS, KR, HG, east of Falster; bO, 15 m (O. Paulsen); VG, QS, N.E. of Moen; 7,5 miles E. of 
Hellehavns Nakke (C. A. J.); 20 miles E. by N. of Moens light-house (C. A. J.); 13,5 miles E.S.E. of Moens 
light-house, 24 m (C. A. J.); QN, QM, Koge Bugt. — Bb: Adler Grund, 20 and 30 meters (C. A. J.); SH, 
Rønne Banke; YH, off Rønne, 24,5 m; 8 miles S.1/, E. of Rønne harbour, 11—19 m (C. A. J.); XZ!, Da- 
vids Banke, 29 m; 3 miles S.S.E. of Nexo harbour, 21 m (C. A. J.); YC, near Salthammer Rev, 24,5 m. 
Membranoptera Stackhouse. 
1. Membranoptera alata (L.) Stackhouse. 
Stackhouse, Tentamen marino-cryptogamicum. Mémoires de la soc. imp. des Natur. de Moscou, Tom. 2, 
Moskwa 1809 p. 85 (teste Kylin); Kylin 1923 p. 108. 
Fucus alatus Hudson, Fl. Angl. Ist ed. 1762 p. 578 (not seen); Oeder Fl. Dan. tab. 352, 1767. 
Delesseria alata (Huds.) Lamour. Essai 1813 p. 124; Lyngbye 1819 p. 8 pl. 2; Hornemann FI. Dan. tab. 
2129, 1836; Harvey Phye. Brit. III 1851 pl. 247; J. Agardh 1852 p. 683; Wille 1885 pp. 31, 64, 
id. 1887 p. 62 figs. 14—20, 79; Kny Wandtaf. Taf. 77. 1886, Erlauterungen p. 334; Buffham 1893 
p- 296 figs. 22—24; Phillips 1898 p. 183 figs. 17—19; Kolderup Rosenvinge, Sporeplanterne 1913 
p. 112 fig. 158. 
Hypoglossum alatum Kützing, Phyc. gen. 1843 p. 445, pl. 66; Tab. phyc. Bd. 16 tab. 16, 1866. 
Pteridium alatum J. Agardh 1898 p. 225. 
The apical cell-divisions of the frond have been described and figured by Kny 
(1886), WILLE (1887), myself (1913) and recently by Kyrın (1923). The latter au- 
thor shows that the structure of the tip of the frond resembles that of Delesseria 
sanguinea but differs from it 1) in the absence of intercalary divisions, 2) in that 
the lateral pericentral cells do not divide by transversal walls, and 3) by the branch- 
ing of the frond by the secondary apical cells transforming into primary ones. After 
the division of the primary segment cut off from the apical cell by two longitudinal 
walls, the two lateral cells are divided by inclined walls in a number of segments of 
