164 



sporogenous filamenls 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 (Boknet and Thuret 1. c. fig. 2 — 5). The ripe cystocarp 

 is globular or somewhat lobed ; it projects in the slimy medullary space (Kutzing 

 1. c, BoRNET 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 Vaderoarne, Bohulan. 



Localities. Sk: 1 mile NW of Hirslials, 15 m. — Kn: XI, Herthas Flak, 20— 22,5 m; TQ, at 

 Triiidcleii light-ship. 



Furcellaria Lamouroux. 

 1. Furcellaria fastigiata (Hudson) Lamouroux. 



Lamouroux, Ann. du Mas. XX. 1813, p. 40; Greville, Alg. Brit. 1830, p. (57, tah. XI; Kutzing, Ph3'c. 

 gener. 1813, p. 402, Taf. 71 (habit and anatomy); Harvey, Phyc. Brit. I, 1846, pi. 94, III, 1851, pi. 

 357 (cystocarps and tetraspores); Areschoug, Phyc. Scand. mar. 1850, p. 88, Tab. IV A; Caspary, 

 Observations on Furcellaria fastigiata, Huds. and Polyides rotundas Gmel. Ann. & Mag. N. Hist. 

 Ser. 2, Vol. VI, 1850; J. Agardh, Spec. I, 1851, p. 196; Thubet, Rech. s. 1. fecondation des Fucacees 

 et des antheridies des Algues. II. Ann. d. sc. nat. 4e ser. tome 3, 1855, p. 42 pi. 3 fig. 6 — 7; Kutzing, 

 Tab. phyc. Bd. 17, tab. 99, 1867. 



Reinke, Allgem. Botanik, 1880, p, 134 tig. 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 lig. 14, Beitr. physiol. Gewebesyst., 1887, p. 86, Taf. 6 (VIII) fig. 76 — 78; Kolkwitz, 

 Beitr. z. Biol, der Florideen. Wiss. Meeresunters. N. Folge. 4. Bd. Abt. Helgoland Heft 1. 1900, p. 31, 

 46, tig. 4; SvEDELius, Stud. Ostersj. hafsalgtl., 1901, p. 130; Oltmanns, Morph. u. Biol. d. Alg. I, 1904, 

 p. 545, fig. 329 (longitudinal section of upper end of frond and transverse section of frond); Denys, 

 Untcrsucli. an Polyides rotundus Gmel. und Furcellaria fastigiata Lamour., Belli, z. Jahrb. d. Hamburg, 

 wissensch. Anstalten. 1910. 



Fiiciis fastigiatiis 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. 



Fiiciis 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.i 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 



