475 
cell. I have found the same in Hypoglossum Woodwardii Kitz. (Delesseria Hypo- 
glossum (Woodw.)) (fig. 437). 
The first stages of the germination have been observed by Kyrın (1917 p. 21). 
NIENBURG, who studied the further development, found that the sporeling is early 
divided by parallel walls into four cells. By irregular divisions of the two middle- 
most and partly of the lowermost and the upper of these cells, a flat body without 
mid-rib is produced which corresponds to the primary frond in Nitophyllum and 
continues in the primary frond, showing the typical structure. 
Apoglossum ruscifolium has been met with in two localities in the northern 
and eastern Kattegat in great depths with salt water, 20—22,5 m, in July, in each 
place only in one specimen. They were both provided with tetraspores. The largest 
specimen was 2 cm high, 4 mm broad. According to Kuckuck it accomplishes its 
course of life in scarcely more than four weeks. ARESCHOUG states, however, that 
it has been found fructiferous at the western coast of Sweden in July to September. 
Localities. Kn: XJ, Herthas Flak, c. 20 m. — Ke: ZF, near Fladens light-ship, 22,5 m. 
Delesseria Lamouroux. 
1. Delesseria sanguinea (L.) Lamouroux. 
Lamouroux, Essai 1813 p. 124; Lyngbye, 1819 p.7 pl. 2; Flora Danica tab. 2198,2 1836 (f. lanceolata 
Ag.); Kützing, Phyc. gen. 1843 p. 445 pl. 67; Harvey, Phye. Brit. II pl. 151, 1849; Buffham, 1893, 
p. 296 pl. XIV figs. 28—30; Kuckuck, 1894 p. 255; Kolkwitz, 1900 p. 41; Kylin, 1907 p. 136; 
Svedelius, Svensk Botan. Tidskr. Bd. 5, 1911 p.200, Bd. 6, 1912 p. 239, Bd. 8 1914 p. 1; Kylin, 
1923 p. 92. 
Fucus sanguineus Linne Mantissa 1767 p. 136; Oeder Fl. Dan. tab. 349 1767. 
Hydrolapathum sanguineum Stackhouse Tent. 1809 p. 67 (not seen); J. Agardh, Sp. g. ord. Vol. III 1876 
p. 370; Le Jolis, Liste.. Cherbourg 1864 p. 133; Wille, 1887 p. 57 figs. 1—13; J. Agardh, Analecta 
alg. cont. IV 1897 pp. 22, 41. 
Wormskioldia sanguinea Sprengel, Syst. veg. IV 1827 p. 331; J. Agardh, 1851 p. 408. 
The cell-divisions in the tip of the frond are very regular (comp. WILLE, KYLIN). 
As emphasised by Kyrın (1923 p. 93), intercalary cell-divisions do not take place 
in the primary cell-row but in the cell-rows of the second and third orders. These 
divisions are marked with an + in my fig. 438 B. The cell-rows of the third order 
are given off from the lower side of those of the second order, and the cell-rows of 
the fourth order equally from the lower side of those of the third order (fig. 438, comp. 
Kyrın 1923 fig. 61). The pericentral cells cut off from the primary cell-row are early 
divided by a transverse wall (fig. 443). The cells surrounding the central cell-row 
are therefore of half the length of the central ones. As the central cells never divide 
by transverse walls they become very long. They are connected with one another 
by a broad pit in each transversal wall. The nucleus early divides into two, and 
the divisions continue, in consequence of which the older central cells contain nu- 
merous nuclei. The first transverse wall dividing the young pericentral cell is situated 
