KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. Iso 
afterwards moistened specimens. Antheridia and sporocarps are sometimes, but appa- 
rently not always, developed on the same individual. The development begins at the 
margin, proceeding inwards. Of two cells in the same cross section either both may 
be developed into antheridia or sporocarps, or the one may become an antheridium, the 
other a sporocarp (fig. 7—8). The sporocarps contain only few spores. 
Habitat. It grows, when attached, sublitoral, and usually scattered in 2—3 fathoms 
water. I have never found it but on exposed coasts. Specimens with sporocarps 
have been taken at the end of July and the beginning af August. 
Geogr. Distrib. Known only from the Norwegian Polar Sea. Its most northerly 
known locality is Maasé in Finmarken about Lat. N. 71°. 
Localities: The Norwegian Polar Sea: Nordlanden according to specimens in KLEEN’s 
and WauLeNserc’s herbaria, Tromsé Amt near the town of Troms6; Finmarken at 
Maas6, local, but abundant. 
Diploderma miniatum (AG.) nob. 
Ulva purpurea # miniata AG. Syn. Alg. p. 42. 
Descr. Ulva miniata Lynos. Hydr. Dan. p. 29. 
Fig. » » » » » reels ed OF 
Porphyra miniata Fl. Dan. t. 2394. 
» » Kutz. Tab. Phyc. 19, t. 81. 
Diploderma miniatum Tab. nostra 18. fig. 9. 
Syn. Porphyra miniata Ksevum. Spetsb. Thall. 1, p. 32. 
» vulgaris CroauL, FI. Disc. p. 461 (?). 
» » Dicktg, Alg. Sutherl. 1, p. 144(2). 
Remark on this species. In the herbarium of the Copenhague Museum there are to 
be found under the name of Porphyra (Ulva) miniata a considerable number of speci- 
mens of the plant in question at different stages of development. The description 
given by Lynesye 1. ¢. of the alga named by him Ulva miniata accords well with 
them. Thus I think we may safely assume that Lynosye’s description, as well as 
C. A. Acarpu’s description of Ulva purpurea ? miniata, is founded on some of these 
specimens. The last author states expressly that the plant designed by him was from 
Greenland, communicated by WormsktéLtp; cp. Spec. Alg. 1, p. 407. However, this 
Greenland species is no Porphyra, but a species of Diploderma, most closely allied to 
the preceding one, though certainly specifically distinct from it. It has a different 
colour, more firmness, at least when older, and almost no folds. Besides, it is always 
dioecious, as far as my observations go. 
Habitat. At Spitzbergen I have found the present species in the lower part of 
the sublitoral zone at a depth of 10—15 fathoms, attached to stones. I cannot state 
anything with certainty with respect to its occurrence at Greenland. On the labels 
appended to the specimens in the herbarium of the Copenhague Museum, we read: 
yin mari ad saxa, ad stipites L. saccharine (caule fistuloso) ad stipites L. saccharinw»; 
from which it may be concluded that the plant is even here sublitoral, growing chiefly 
