583 
localities. It has been met with at 8—19 metres’ depth in water of comparatively high 
salinity (about 30 p.m.) on gravelly or stony bottom, but is very often attached 
to other Algæ (Phyllophora membranifolia, Furcellaria fastigiata, Brongniartella byssoides, 
Corallina officinalis) or to dead leaves of Zostera. It has only been observed in the 
months of July to October. Well developed fructiferous specimens, up to 26 cm 
high, were met with in July and August, but they seem to die away at the end 
of summer, for in September small specimens only were observed. Germlings were 
found in Nature already in August, and the small specimens found in September 
must be supposed to originate from spores produced in the foregoing summer. They 
were all sterile. It must further be supposed that the growth of the new plants is 
arrested during winter and spring and is only resumed in the following summer. 
Localities: Kn: Tonneberg Banke, TP and PO, 16—18 m, stony ground, young specimens, 
September; TQ, near the light-ship at Læsø Trindel; FF, near Læsø Trindel, 15 m; Nord Øst Rev at 
Hirsholmene; east of Hirsholmene (Ostenfeld); Nordvestrev at Hirsholmene; TY south of Hirsholm, 
east of Kolpen (A. Otterstrom); Trestensrev (Henn. Petersen); various places near Nordre Ronner; 
7—11,5 m. — Ke: ZG, ZE!, VY, Fladen, 17-—19 m. 
Lomentaria Lyngb. 
1. Lomentaria elavellosa (Turn.) Gaillon. 
Gaillon, Dietionnaire des sciences natur. Vol. 53. Extrait, Strasbourg 1828, p. 19; Le Jolis, Liste des 
Alg. mar. 1864, p. 132; F. Debray, Structure et développement des Chylocladia, Champia et 
Lomentaria. Bull. scient. de la France et de la Belgique, tome 22. Paris 1890, p. 399; Haupt- 
fleisch, Flora 1892, pp. 325—350, figs. 58—77; Killian, Entw. Florid., Zeitschr. f. Bot. 6, 1914, 
pp. 246— 248; Kylin, Studien, 1923, pp. 44—49. 
Fucus clavellosus Turner, Trans. Lin. Soc. VI, 1801, p. 133, pl. 9, Hist. Fucorum I, 1808. tab. 30. 
Gastridium clavellosum Lyngbye 1819, p. 70, tab. 17. 
Chondria clavellosa C. Agardh, Spec. alg. Vol. I, 2, 1832, p. 353; Hornemann, Flora Danica tab. 2200, 1834. 
Chylocladia clavellosa Grey. in Harvey’s Manual 1841, 
p- 71; J. Agardh, Sp. g. o. II, 2, 1852, p. 366. 
Chrysymenia clavellosa J. Agardh, Alg. m. medit. 1842, 
p- 107; Harvey Phye. Brit. I, 1846, pl. 114. 
Chondrothamnion clavellosum Kützing, Tab. phye. XV, 
tab. 81, 1865. 
As emphasized by earlier author’s e. g. 
Ky in (1923, p. 44) there is much accordance 
between Lomentaria clavellosa and Chylocladia 
kaliformis as to the structure of the frond. 
The cortex forming the wall of the hollow 
frond consists, at least in older portions, of two 
layers of cells, the outer layer of smaller cortical 
cells being here continuous. The medullary longitudinal filaments (fig. 581) are more 
irregular and often connected with each other by lateral pits. Diaphragms are wanting. 
Fig. 581. 
Lomentaria clavellosa. Cross section of frond, 420 : 1 
