65 
Localities. Ns: Nordby, Fano (C. Rasch, abundantly in the Fucus-zone!); Esbjerg (Borgesen, on 
moles and embankments in the upper half of the littoral region!); groins by Thyboron (in spring chiefly 
f linearis, in summer only broader forms. — Sk: Hirshals (on the mole and on boulders on the shore, 
in spring f. linearis abundantly above high-water mark, in summer the species disappears entirely or 
almost entirely). — Lf: Harbours of Lemvig, Struer and Thisted; Aalborg, harbour and piers of bridge 
(!, Th. Mortensen and unknown collector in herb. C. Rosenberg); Nørre Sundby; Hals. — Kn: Harbour of 
Skagen; Busserey (with Bangia near high-water level, small specimens in April; harbour of Frederiks- 
havn (in winter f. linearis abundantly, mainly at high-water level, in summer only broader forms, as 
a rule in small quantity); harbour of Sæby. — Ks: Harbour of Grenaa. — Sa: Kyholm (upper Fucus- 
zone, with Ralfsia); Aarhus, harbour, and on boulders on the shore by Riis Skov. — Lh: Harbour of 
Bogense (!, Borgs.); Fredericia (Hofm. Bg., Joh. Lange,!); Strib; harbour of Middelfart (Hofm. Bg., C. Ro- 
senb.,!), Kongebro. — Sh: Harbour of Lohals; Smorstakken. — Su: Harbour of Helsingor. 
2. Porphyra leucosticta Thuret. (Plate II fig. 4—13.) 
Thuret in Le Jolis, Alg. mar. de Cherb. 1864, p.100. Janczewski, Ann. se. nat. Ve ser. t. 17, 1873, p. 241 
pl. 19 fig. 1—14. Berthold (1881) p.79. Id. (1882) Taf.1 Fig. 1—6. 
Porphyra atropurpurea Olivi in Saggi Accad. di Padova III. 1. 1791, teste De-Toni, Syll. Alg. IV. Sect. 1, p.17. 
Exsicc.: Crouan Alg. mar. du Finistère No. 397. Le Jolis Alg. mar. de Cherbourg No. 156. 
This species which has only been met with on our most northern shores, 
occurs there in its typical shape but does not attain a considerable size. The 
largest observed specimens are (in a dried 
state) 10—11 cm. long, only one specimen was UN - 
16 cm. long. The longest fronds are lingulate, | à an, 
(8 \ Uy, 
A 
about 2—4 cm. broad, with rounded or more 
frequently cordate base, but very often the 
margins of the frond overlap each other below 
he baser, particularly in the broadest speci- Porphyra leucosticta. | sections of frond 
mens, in which the attachment may then with carpogonia: in 4 these are not fertilized, 
become apparently umbilicate. The frond is wre in Eines a Pe ae MINS 
generally entire, rarely a little lobed, the 
margin more or less undulated. The colour is as a rule a little more reddish than 
in P. umbilicalis, but the difference is not absolute; the two species can occur with 
exactly the same colour. The thickness of the frond I found to vary between 
28 and 44 y. 
The specimens met with in April were all provided with sexual organs, in 
so far as they had attained a tolerable size. The antheridia formed the well 
known patches, running longitudinally in the upper part of the frond, 5—10 mm. 
long, 1—1,5 mm. broad. There are, however, also very small antheridial patches, 
originating in a group of very few mother-cells. The number of spermatia arising 
from each mother-cell is fairly often smaller than 64. As shown by JANCZEWSKI 
(1. c. p. 247), isolated cystocarps are often scattered among the antheridia. The 
carpogonia had very often produced a hyaline protuberance at each extremity, a 
state which, according to BERTHOLD, is due to the fact that the carpogonia have 
been obliged to wait a long time for fecundation. When all the carpogonia assume 
this form, the frond becomes papillose on both sides. Fig. 7 B shows a spermatium 
D. K. D. Vidensk. Selsk. Skr., 7. Række, naturvidensk. og mathem. Afd. VII. 1. 9 
