164 
sporogenous filaments which fuse with the auxiliary cells occurring in great numbers 
on the inner side of the cortex. After the fusion the auxiliary cell produces on its 
inner side the gonimoblast (BORNET and THURET |. c. fig. 2—5). The ripe cystocarp 
is globular or somewhat lobed; it projects in the slimy medullary space (KüTziNG 
l. c., Bonnet and THURET fig. 2—4). 
The species has only been found in three localities in the northern Danish 
waters. The largest specimen (from TQ) is 4,5 cm long, 3 mm large. It has been 
found with antheridia and carpogonia in July, with cystocarps in August and Sep- 
tember. It occurs on stony or gravelly bottom. — At Helgoland it has been found 
in well developed specimens, and it has been met with at Väderöarne, Bohulän. 
Localities. Sk: 1 mile NW of Hirshals, 15 m. — Kn: XI, Herthas Flak, 20—22,5 m; TQ, at 
Trindelen light-ship. 
Furcellaria Lamouroux. 
1. Furcellaria fastigiata (Hudson) Lamouroux. 
Lamouroux, Ann. du Mus. XX. 1813, p. 46; GREvILLE, Alg. Brit. 1830, p. 67, tab. XI; Kürzıng, Phyc. 
gener. 1843, p. 402, Taf. 71 (habit and anatomy); Harvey, Phyc. Brit. I, 1846, pl. 94, III, 1851, pl. 
357 (cystocarps and tetraspores); ARESCHoUG, Phyc. Scand. mar. 1850, p. 88, Tab. IV A; Caspary, 
Observations on Furcellaria fastigiata, Huds. and Polyides rotundus Gmel. Ann. & Mag. N. Hist. 
Ser. 2, Vol. VI, 1850; J. AGARDH, Spec. I, 1851, p. 196; Taurert, Rech. s. L fécondation des Fucacées 
et des anthéridies des Algues. II. Ann. d. sc. nat. 4e ser. tome 3, 1855, p. 42 pl. 3 fig. 6—7; Kürzıng, 
Tab. phyc. Bd. 17, tab. 99, 1867. 
REINKE, Allgem. Botanik, 1880, p, 134 fig. 97 (longitudinal section of extremity of frond). Algenflora 
w. Ostsee, 1889, p. 26 (f. aegagropila); WILLE, Alg. physiolog. Anatomi, 1885, p. 55, 63, 84 ex parte, 
not Tafl. VIII fig. 14, Beitr. physiol. Gewebesyst., 1887, p. 86, Taf. 6 (VII) fig. 76—78; KoLkwiızz, 
Beitr. z. Biol. der Florideen. Wiss. Meeresunters. N. Folge. 4. Bd. Abt. Helgoland Heft 1. 1900, p. 31, 
46, fig. 4; SvepeLius, Stud. Östersj. hafsalgfl., 1901, p. 130; Ortsanss, Morph. u. Biol. d. Alg. I, 1904, 
p. 545, fig. 329 (longitudinal section of upper end of frond and transverse section of frond); Denys, 
Untersuch. an Polyides rotundus Gmel. und Furcellaria fastigiata Lamour., Beih. z. Jahrb. d. Hamburg. 
wissensch. Anstalten. 1910. 
Fucus fastigiatus Hudson Fl. angl. ed. 1. 1762, p. 588; Oeder, Flora Danica tab. 393, 1768 (with adventi- 
tious shoots). - 
Fucus furcellatus Oeder Fl. Dan. tab. 419, 1768. 
Fucus lumbricalis Gmel., Hornemann, Flora Dan. tab. 1544, fig. 6, 1816 (tetrasporangia). 
Furcellaria lumbricalis Lyngbye, Tent. Hydr. p. 40, tab. 40 A, 1—4. 
Fastigiaria furcellata (L.) Stackhouse, Le Jolis, Liste Alg. Cherbourg, 1864, p. 124. 
The mode of growth, ramification and structure of this common alga has so 
often been described and figured that it may be sufficient to refer to other works, 
adding only some supplementing remarks. 
The apex of the frond consists of a great number of densely joined cell-fila- 
ments which are parallel and vertical in the middle, becoming gradually more 
divergent towards the periphery. (“Springbrunnentypus” of OLTMAnNs). The central 
filaments continue downwards in long longitudinal filaments, which constitute an 
essential part of the medulla, while the more peripheral ones gradually develop 
into the cortex, which consists of radiating, dichotomously branched filaments. The 
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