374 



Found in shallow as well as deep water, and both along shel- 

 tered and exposed coasts. At the head of Kalbakfjord it was found 

 attached to stones in quite shallow water which had a strong ad- 

 mixture of fresh water. Fructifying specimens have not been 

 met with. 



This species seems to be rather rare along the Færoese coasts. Lj^ng- 

 bye (Hydrophy t. , p. 109: »Habitat ad insulas Færoenses«) reports it 

 from the Færoes, but no Færoese specimens of it are to be found in 

 his herbarium. Rostrup writes with reference to it »a few specimens 

 only were found.« 



I have seen specimens from: — Str.: Head of Kalbakfjord (!) , Gli- 

 versnæs(I); Ost.: Ore(!); Syd.: Trangisvaag (Ostenfeld). 



43. P. fastigiata (Roth) Grev. Kjellm., N. I., p. 159 (123); Hut- 

 chinsia fastigiata Lyngb., 1. c. p. 108. 



Found in the littoral zone, almost exelusively on Ascophyllum 



nodosum ; but Lyngbye says that in a few rare instances he found 



it growing also on Fucus vesiculosus and on rocks. Tetraspore- 



bearing specimens were found in June and July, cystocarpic in 



July and August. Its dense, bushy growth affords a favourable 



habitat for numerous small epiphytes, especially Chantransia secun- 



data and crusts of Dermocarpa. It is perennial and has been found 



with young shoots in the beginning of March. 



This species is common everywhere where Ascophyllum is met with, 

 i. e. in somewhat sheltered and perfectly quiet piaces. 



PTEROSIPHONIA Fkbg. 



44. P. parasitica (Huds.) Fkbg. Die Rhodomelaceen des Golfes 

 von Neapel, p. 265; Kjellm., N. I., p. 152 (117); Hutchinsia Mostingii 

 Lyngb., Hydrophyt., p. 116, tab. 36. 



Found along exposed coasts in the sublittoral zone and espe- 

 cially abundant in caves in shallow water where at low tide it may 

 easily be gathered in a hand-dredge at a deplh of about one fathom. 

 Grows liere on the vertical faces of rocks and found attached either 

 to the rock itself or to shells and Lithothamnion polymorphum, often 

 associated with Lomentaria clavellosa, Plocamium coccineum, Deles- 

 seria sinaosa and other Florideæ. 



In Trangisvaagfjord Jonsson found a specimen growing at- 

 tached to a crab which he dredged from a depth of 10 fathoms. 



This species is hardly rare along the exposed coasts of the Færoes. 

 Found in the following piaces: — Str.: Kvivig (Lyngb., ! in caves); Ost.: 

 Molen Lyngb.,!); Vaago: cave on the north side(!), cave opposite 

 Kvivig ! .; St. Dimon ! ; Syd.: Kvalbo Ejde (H. S.), Trangisvaagfjord II. .1. . 



