60 
Frederikshavn in some years only in small quantities, while in others it forms 
extensive growths especially on the outer side of the south mole, as in the be- 
ginning of August 1902. In the Little Belt it completely disappears in summer, at 
all events in certain years (e. g. 1901), while in spring it is often abundant and 
luxuriant. In March 1894 it was so well developed there, that I have never found 
it better developed on the Danish shores; the threads attained a length of 14—15 cm 
and were above thick and curled (fig.3). In April 1904 I searched for it in vain at 
the same place. This is the most southern locality known on the Danish shores. 
Localities. Ns: Thyborøn, groin No. 58. — Sk: Hirshals, on the mole and on a boulder on 
the shore, observed in the months April to August, may occur abundantly still in July. Has also been 
found growing on Phyllitis zosterifolia (fig. 4). Greatest length of the threads observed here ca. 7 cm. — 
Lf: Harbour of Lemvig (2); Thisted; Glyngøre. — Kn: Harbour of Skagen: Busserev by Frederikshavn 
(April and July); harbour of Frederikshavn. — Ke: Harbour of Gilleleje. Febr. and May, ca. 1 cm long. — 
Lb: Harbour of Fredericia (Hofm. Bang. !); harbour of Middelfart, stone-slope west of the harbour, March 
and April, Kongebro. 
Bangia pumila Aresch. (DARBISHIRE, Ueber Bangia pumila Aresch., eine ende- 
mische Alge der östlichen Ostsee. Wiss. Meeresuntersuchungen, N.F. 3.Bd., Abt. 
Kiel 1898, S. 25) which according to DARBISHIRE is readily distinguished from B. 
fusco-purpurea as well as from the fresh-water B. atro-purpurea, and which, as far 
as known, is endemic in the Baltic, has not been met with hitherto in the Danish 
shores, though I have sought for it, particularly on the shores of Bornholm. It 
differs from B. fusco-purpurea in particular in that the articulation of the frond is 
still distinct in the older frond, which is divided by longitudinal walls, and through 
smaller cystocarps. As it has been found at Swinemünde and at Dantzig, there is 
reason to believe that it may also be found on the Danish Baltic coasts. 
According to KyLix (1907 p.109), however, this species has been found by 
ARESCHOUG not in the Baltic but “in den innersten Buchien von Göteborg”. This 
author regards it as being not a distinct species but probably only feebly developed 
specimens of B. fusco-purpurea. 
Porphyra Agardh. 
1. Porphyra umbiliealis (L.) J.Ag. (Plate I and II fig. 1—3.) 
J. Agardh (1883) p. 66. 
ir laciniata (Lightf) Ag: Thuret in Le Jolis Liste des Alg. mar. de Cherbourg 1864, p. 99, Janczewski, 
Études anat. sur les Porphyra. Ann. sc. nat. Ve ser., t 17 1873, p. 241, pl. 19 fig. 25—26; Thuret et 
Bornet, Études phycologiques, 1878, pl. 31, p. 58. 
f. linearis (Grev.) Harv. 
P. linearis Greville, Alge britannicæ 1830 p. 170 tab. 18; Kützing Tabulæ phycologicæ XIX tab. 79: J. 
Agardh, Lc. p. 71; Le Jolis Algues marines de Cherbourg No. 96; Kylin (1907) p. 111. 
Ulva purpurea 5, elongata Lyngb. Hydr. p. 29. h 
P. vulgaris forma, Harvey Phycologia Britannica pl. 211, fig. 2-3; Thuret in Le Jolis Liste p. 99. 
P. hiemalis Kylin, (1907) p. 112 Taf. 3 fig. 2 
f. vulgaris (Ag.) Thur. in Le Jol. Liste p.99. 
Ulva purpurea Roth Catalecta I p.209, Lyngb. Hydr. p. 29. 
