269 



The cells of the vertical cell-rows are proportionally short, and connected with trans- 

 versal pits. Only empty conceptacles were found. They are about 420—500 fi in 

 diameter, conical-subheniispherical, somewhat lower in proportion to the breadth 

 than in L. macrocarpum. The roof is of solid structure and is very thick near 

 the osliole. The cells surrounding the upper part of the ostiole are elongated but 

 not projecting as free papillse. Our alga reminds one of L. pustulatum f. aus^raZis Foslie 

 (Remarks, p. 117, Nichols, Contrib. II, 1909, p. 356, fig. 21—24) from which it differs, 

 however, to judge from Nichols' description, by the want of papillae surrounding 

 the ostiole. As the conceptacles were empty, their nature could not be determined. 



Locality: Ke : Store Middelgrund 19 meters, May. 



Corallina L. 



1. Corallina officinalis L. 



Linne, Fauna Suecica 1761, p. 539; Kiitziiig, Phyc. gener., 1843 p. 388, Taf. 79, Fig. 1 ; Harvey, Phyc. Brit. 

 II, 1849, pi. 222; J. E. Areschoug in J. Agardh, Spec. II, 2, 1851- 52, p. 562; Kiitzing, Tab. phyc. 

 Vol. 8, 1858, Tab. 66 — 68; Kny und Magnus, Ueber achte und falsclie Dichotomie im Pflanzenreich. 

 Botan. Zeit, 1872 Sp. 708; Thuret, Etudes pliycologiques, 1878, p. 93 pi. 49; Solms, Corallinenalg., 

 1881 (Corallina mediterranea) ; Haucl?;, .Meeresalg., p. 281; Guignard, Dev. et const, des antherozoides. 

 Revue gen. T. I, 1889, e.xtrait, p. 60, pi. VI fig. 24—26 (spermatia); B. M. Davis, Kerntheilung in 

 der Tetrasporenmutterzelle bei Corallina offic, Ber. deut l)ot. Ges. 1898, Bd. 16 Heft 8, p. 266; K. 

 Yendo, Corallinse vera; japonica;. Journ. Coll. of Science. Imp. Univ. Tokyo. Vol. XVI. Art. 3, 1902, 

 p. 28, pi. Ill fig. 11 — 13, pi. VII, fig. 10—13; id.. Study of the genicula of Corallina;. Ibid., Vol. XIX, 

 Art. 14. 1904; id., A revised list of Corallinse. Ibid., Vol. XX, 1905, p. 29; Oltmanns, Morph. u. Biol- 

 d. Algen, I, 1904, p. 562. 



The articulated fronds are given off from a basal crust much resembling some 

 crustaceous Lithothamnia (comp. Harvey, 1. c). In some cases it is rather small 

 and gives off numerous closely placed fronds from almost its whole surface. In 

 other cases it is widely extended, up to 2,4 cm. in diameter or more, and bears 

 only a small number of erect fronds (fig. 192). The border 

 is lobed, the lobes being now broad, now narrow. In the 

 latter case the lobes are more or less branched and often 

 keep their independence, being separated by deep furrows 

 when meeting, but it also happens that they grow partly 

 over each other; in other cases, however, they are con- 

 fluent. Concentric zones are sometimes very distinct. In 

 the anatomical structure they resemble the crustaceous 

 Lithothamnia, showing a hypothallium consisting of long 

 cells running in a horizontal direction and a perithallium 

 composed of ascending filaments of shorter cells. The last 

 cell of the latter is very short, the penultimate proportio- 

 nally long. There seems to be a continuous layer of non- 



Fig. 192. 

 Corallina officinalis. Basal crust 

 with scattered articulated fronds 

 or scars alter them; at right it 

 meets with a crust of a Litho- 

 thamnion, 4:1. 



