509 
grund; Asaa, mole; Anholt harbour; Gerrild bay (Lyngbye). — Ks: Grenaa harbour; at Hesselo 
(Lyngbye); RL near Ostindiefarer Grund; aU off Lumbsaas 13 m; Hastens Grund; GG Sjællands Rev; 
Holbæk harbour; on stones picked up near Roskilde. — Sa: Common on stony ground in 0 to 15 m 
depth, from KM, east of Oreflippen and the channel east of Sejro to Endelave and DJ North of Fyn. 
Several specimens of f. incurvala from Hofmansgave (Hofm. Bang, Lyngbye). — Lb: Bogense harbour; 
Prins Frederiks Grund, Vejlefjord; FZ, Kasserodde; Fredericia harbour; Middelfart, harbour and 15 m; 
Assens harbour; at Sonderballe Hoved 2 m, 1—1.5 em long specimens. — Sf: Faaborg harbour; UX at 
the North end of Ærø 9.5 m; CG, Skrams Flak, f. incurvata, loose. — Sb: Off Refsnæs (C. H. Ostenfeld); 
Kalundborg harbour; gU, east of Lille Grund 10—12 m; Elefantgrund 6—7 m; LP, Stavreshoved, 
2—4 m; Kerteminde harbour; bay of Kerteminde; GY and fZ at Sprogo; AB off Teglgaardsskov; Knuds- 
hoved 5—6 m; Nyborg harbour; Palegrund 7,5 m; XS near Kloverhage; GZ North of Egholm 6,5 m; 
DN Vengeance Grund 12m; gB, Vresens Puller; gE, Stokkebæks Flak 6 m, f.incurvala; fS, east of 
Kjelsnor ligthouse, 11.5 m. — Sm: Q, off Vesterskovs Flak, 7.5 m, f.incurvata. — Su: Off Ellekilde and 
Hellebæk (@Orsted,!); washed ashore at Helsingør (Liebman a. 0.); PX, off Tibberup, 8.5 m, with 
Zostera; TF", Staffans Flak, 12—13 m; QD, east of the North end of Saltholm. — Bw: bY, off Sonder- 
borg Nordskov, 11 m, f. incurvata; Sønderborg (Frölich according to Reinke); UL, Øjet, 20 m, attached 
to the bottom. — Bm: bP, Kriegers Flak, 15 m (O. Paulsen). 
Gigartina Stackh. 
1. Gigartina mamillosa (Good. et Woodw.) J. Agardh. 
J. Agardh, Alg. mar. mediterr. p. 104 (1842); Sp. g. ord. Alg. Vol. II, pars. 1, p. 273, 1851; Harvey, Phye. Brit. 
Vol. II, 1849, pl. 199; Buffham 1896, p. 84, plate X, figs. 4—8; Oltmanns, Morph. u. Biol. I, 1904, 
p. 547. fig. 331. 
Fucus stellatus Stackhouse in Withering, Bot. Arr. ed. 3, vol. IV, p. 99, excl. syn. omn. (1796), sec. Batters. 
(Not seen by the author). 
Fucus mamillosus Good. et Woodw., Trans. Linn. Soc. Vol. III, 1797, p. 174. 
Spherococcus mamillosus Agardh, Synops. Alg. scand. 1817, p. 25; Lyngbye Tent. 1819, p. 14, tab. 5 C; 
Flora Danica tab. 2011, Hornemann 1830 (from the Færûes). 
Mastocarpus mamillosus Kützing, Phycol. gener. 1843, p. 398, Tab. 76 III, Tab. phycol. XVII, pl. 39, 1867. 
Gigartina stellata Batters Catal. of the Brit. Marine Algæ. Suppl. to the ‘Journ. of Botany’ 1902, p. 64. 
This Alga reminds one in habit of Chondrus crispus, a tuft of upright fronds of 
a similar shape as in this species springing from a flat disc. The latter is composed 
of densely united vertical cell-rows and shows seyeral transverse lines indicating a 
periodical growth. The upright fronds are placed closely together; they are more 
or less canaliculate and bear numerous papille on one or on both faces. The 
papillae seem to: arise in spring (comp. 476 B). 
The upright fronds haye a cortex built up of outward directed cell-rows con- 
sisting of small oblong cells becoming smaller towards the surface, the outermost 
being only 2 w thick. The number of cells in these rows may be 7—10. Within 
this dense assimilating cortex a few layers of somewhat larger almost isodiametrical 
cells form an inner cortex. These cells are more distant from each other, being 
separated by a hyaline intercellular substance, and are connected with primary and 
secondary pits (fig. 474,475 A). They pass into the inner medullar cells which in 
a transyerse section show almost the same aspect being only somewhat larger and 
