58 M. Foslie 



I think Porphyra miniata A r e s c h. Alg. Scand. exsicc. Nr. 

 262 to be, the above quoted f- planiuscula, or at least most 

 nearly related to D. amplissimum. l The frond is 62 p. thick, 

 and the cells are, in cross section, squarish or sometimes rec- 

 tangular, but never attaining the height in propostion to the 

 length as those of f. typica. The colour is generally a little 

 paler than by the typical form, or between f. tenuissima and 

 f. typica. I have the same form from Stavanger and from 

 Lodingen in Nordland. I also met with it at East-Finmar- 

 ken, though not quite typical, but mostly transitions between 

 this form and f. typica. 



The present plant is as a rule sublitoral, occurring on 

 a depth of 1 — 6 fathoms fastened to other algae, but some- 

 times it also lives in the lowermost part of the litoral zone. 

 Loosened specimens are often met with in the later half of 

 July and in August, floating on the surface of the water, or 

 washed ashore in considerable numbers. It prefers open coast 

 but it is also met with in sheltered localities, and it some- 

 times penetrates even pretty far into the greater fjords, for 

 inst. at Lebesby on Laxefjord. Individuals bearing sporo- 

 carps and antheridia have been collected at the end of June, 

 in July and the earlier half of August. 



Distribution: Common almost everywhere along the un- 

 sheltered part of the coast and at some places abundant, for 

 inst. Mehavn and Vardo. 



Gen. Porphyra Ag. 



Syst. Alg. p. XXXII. 



P o r p*h yra laciniata (Lightf.) Ag. 

 1. c. p. 190; Ulva laciniata Lightf. Fl. Scot. p. 974. 



J. G. Agardh, in Alg. Syst. 3, p. 60, refers it to Porphyra (Diplo- 

 derma) miniata (L y n g b.), and he records this species as jnono< 

 strojnatic, 



