SUN 
DK, Bolsaxen, 13-15 m. — Lb: XQ, off Middelfart, north side of Lyngsodde, 19 m; north of Feng Kalv. 
— $b: GT, near the broom at Asnæs; GP off Halskov, 10 m; Avernakhage by Nyborg, shallow water; 
near Vresen, 7—9 m (Ostenfeld). — Su: At Ellekilde Hage 11,5 m. 
Epilithon Heydrich. 
Melobesiae, Ber. deut. bot. Ges. 1897, p. 408. 
1. Epilithon membranaceum (Esper) Heydrich. 
Heydrich, Il. c.; Cotton, Mar. Alg. Clare Island, 1912, p. 150. 
Corallina membranacea Esper, Pflanzenk. 1786 t. 12, fig. 1-4 (not seen). 
Melobesia membranacea Rosanoff, Melob., 1866, p. 66, pl. II figs. 13—16, pl. III fig. 1; Hauck, Meeresalg., 
p. 265; Guignard, Dével. et const. des antheroz., Revue gén. de Botanique. I, 1889, p. 182, pl. VI 
figs. 22—23. 
Melobesia corliciformis Kützing; Rosanoff, Mélob. p. 76, pl. I figs. 14—16; Solms, Corall. p. 11, Taf. III Fig. 25. 
Lithothamnion membranaceum Foslie, List of spec. of the Lith., 1898, p. 7; Remarks, 1905, p. 72. 
As to the morphology of this species reference may be made to the descrip- 
tions of Rosanorr and FosLie, to which I have only little to add. 
The cells of the basal layer are, as pointed out by Rosanorr (1. c. p. 67), not 
arranged in distinct concentric zones; they are often connected through transversal 
fusions (fig. 152 A). The frond is monostromatic in its marginal part, which may 
be of greater or lesser extent. Otherwise the frond is often partly distromatic, and 
near the conceptacles it becomes gradually thicker, the cells dividing by transverse 
walls. There is thus no distinction between hypothallium and perithallium. 
The sporangial conceptacles were often somewhat smaller than stated by Fostiz, 
viz. 110—140 » in diameter. Their outline is frequently oval, as mentioned by 
Rosanorr (I. c. p. 76) and Mme Lemoine (in Corton, Clare Isl. Sury. p. 150). The 
number of the mu- 
ciferous canals was 
also often some- 
what less than that 
found by FOSLIE, 
namely 8—27, most 
frequently 16—21, 
while FostLie indi- 
cates 20—30. No 
relation was found 
between the num- 
ber of the muci- 
ferous canals and 
the locality. 
The sporangia 
Fig. 152. apparently arise 
Epilithon membranaceum. A, frond seen from below showing several fusions. B, tetraspor- En 
angium not yet fully divided. C, sporangial conceptacle seen from above; a sporangium from the second 
is seen under the roof, D, vertical section of sporangial conceptacle, A,B,D 345:1. C 200:1. cell-layer. The 
