KONGL. SV. VET. AKADEMIENS HxVNDLINGAR. BAND. 20. N:0 5. 189 



afterwards moisteiied specimens. Antheridia and sporocarps are soiiiutimes, biit appa- 

 rently not ahvays, developed on the same individual. The developiueiit begiiis at the 

 margin, proceeding iuwards. Of two cells in tlio same cross section eitlier botli may 

 be developed into antheridia or sporocar[)s, or the one may become an antheridinm, the 

 other a sporoearp (fig. 7 — 8). The sporocarps contain only few spores. 



Habitat. It grows, when attached, snblitoral, and usually scattered in 2 — 3 fathoms 

 water. I have riever found it but on exposed coasts. Speciraens with s[)oroearps 

 have been taken at the end of July and the beginning af August. 



Geogr. Distrih. Known only from the Norwegian Polar Sea. Its most northerly 

 known locality is Maasö in Finmarken about Lat. N. 71°. 



Localities: The Norivegian Polar Sea: Nordlanden according to specimens in Kleen's 

 and Wahlenberg's herbaria, Tromsö Amt near the town of Tromsö; Finmarken at 

 Maasö, loeal, but abundaut. 



Diploderma miniatum (Ag.) nob. 



Ulva piirpurea p' miniata Ag. Syn. Alg. p. 42. 

 Descr. Ulva miniata Lyngb. Hyclr. Dan. p. 29. 

 Fig. » i> » » u t. 6, I). 



Porpiiyra miniata Fl. Dan. t. 2394. 



-» » Klitz. Tab. Phyc. 19, t. 81. 



Diploderma miniatum Tab. nostra 18. lig. 9. 

 Syn. Porpiiyra miniata Kjellm. Spetsb. Thall. 1, p. 32. 

 » vulgaris Croall, Fl. Disc. p. 461 (?). 



» . « DiCKiE, Alg. Sutherl. 1, p. 144(?). 



Remark on this s-pecies. In the herbarium of the Copenhague Museum there are to 

 be found under the name of Porjjhi/ra (Ulva) miniata a considerable number of speci- 

 mens of the plant in question at different stages of development. The description 

 given by Lyngbye 1. c. of the alga named by him Ulva miniata aceords well with 

 them. Thus I think vve may safely assume that Lyngbye's description, as well as 

 C. A. Agardii's description of Ulva purirurea [i miniata, is foundcd on some of these 

 specimens. The last author states expressly that the plant designed by him was from 

 Greenland, communicated by Wokmskiöld; cp. Spcc. Alg. 1, p. 407. However, this 

 Greenland species is no Porpiiyra, but a species of Diploderma, most closely allied to 

 the preceding one, though certainly specifically distinct from it. It has a different 

 colour, more iirmness, at least when older, and almost no folds. Besides, it is alvvays 

 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 : 

 »in mari ad saxa, ad stipites L. saccharinai (caule fistuloso) ad stipites L. saccharina;»; 

 from which it may be concluded that the plant is even here sublitoral, growing chiefly 



