346 



This species belongs to the sublittoral zone and occurs both 

 along exposed and sheltered coasts. It has been found as an epi- 

 phyte only, and in abnndance especially on Desmarestia aculeata, 

 which it sometimes covers quite closely, but it may also be met 

 with though sparingly on Ptilota phimosa (at a depth of 20 fathoms) 

 and Delesseria alata. It has hitherto been found sterile only. A single 

 specimen from Vestmanhavn was possibly fructifying, but being 

 dried it was not capable of closer examination. As pointed out by 

 Kuckuck, 1. c, its chromatophores are not star-like, radiating from 

 a central pyrenoid, as in the true Porp/iyra-species, but they occur 

 as a more or less deeply indented parietal plate, hence I agree with 

 Kuckuck in thinking that this species ought to be separated from 

 the genus Porphyra. 



This species was first reported from the Færoes in Rostrup's list 

 (1. c. p. 88) to whom it was sent by Mr. Randropp, who probably 

 gathered it near Thorshavn. My specimens are from: — Ost.: Molen (!), 

 Ore(!); Str. : Vestmanhavn (!), Kvivig (!), Gliversnæs (!); Syd.: Ordevig (J). 



3. P. leucosticta Thur. Le Jolis, Alg. mar. de Cherb., p. 100. 



In comparison with the specimens (especially from France) 

 which I have had the opportunity of seeing in the collections be- 

 longing to the Botanical Museum in Copenhagen, the Færoese spe- 

 cimens are generally larger and especially broader and more irregu- 

 larly shaped ; the antheridia-sori are likewise broader and of a more 

 irregular form, and arranged irregularly in the thailus and not in 

 the often almost parallel lines which are met with in the French 

 specimens. The colour is not so red as that of P. miniata, but is 

 just between that of P. miniata and P. umbilicalis. 



Along the coasts of the Færoes this species grows both in the 

 littoral zone near low-water mark and in the sublittoral in shallow 

 water. It occurs most commonly in the Corallina-be\t. Fructifying 

 specimens were found from April to August. 



It appears to be fairly common: —Vid: Viderejde (Ostenfeld); Str.: 

 Vestmanhavn (!, Kalbakfj orden (!), Thorshavn (!), Velbestad (!) ; Sandd: 

 Skopen (!); Syd: Kvalbo (Lyngb.; H. S.), Trangisvaag (Ostenfeld;. Lastly, 

 Simmons mcntions it with donbt from Klaksvig Bordo). 



First reported from the Færoes by Simmons but as mentioned 

 above, it was already found by Lyngbye, as a specimen in his her- 

 barium determined as Ulva umbilicalis and gathered July 8th near 

 Kvalbo is this species. 



