397 



Order DUMONTIACEAE. 



DUMONTIA (Lamour.) J. G. Ag. 



65. D. filiformis (FL Dan.) Grev. Kjellm., N. I., p. 200 (157); 

 Gastridium filiforme Lyngb., Hydrophyt., p. 68. 



Found on exposed as well as on sheltered shores, on Ihe former 

 even frequently not far from high-water mark, and most commonly 

 associated with Scytosiphon lomentarius and Phyllitis fascia in hollows 

 containing a little waler. On sheltered shores where the lide is 

 imperceptible it oecnrs in quite shallow water. Generally il grows 

 attached lo rocks and stones, but I have occasionally found it 

 epiphytic on Gigartina. So late as July I found (juantities of it and 

 large vigorous examples, sno-sving thai it oceurs later in the season 

 on the shores of the Færoes than it does on the Danish shores 

 where it is decidedly a spring alga. Jonsson, however, has nol 

 come across it, so it probably disappears later in autiiiiiii. 



This species, which was first mentioned Ironi the Færoes by Ho- 

 strup (1. c. p. 83) is very conimon therc. Lyngbye, curiously enougb, 

 does not record this species from the Færoes in his »Hydrophytologia 

 but in his herbarium in Copenhagen tliere is a small specimen Ironi 

 Kval bo. 



Dilsea edulis Slackhouse is recorded from the Færoes by 

 P. A. Holm in his »Skildringer af Naturen paa Færoerne« (Tids- 

 skrift for populære Fremstillinger af Naturvidenskaberne, Vol. II, 

 p. 204) but as it has not been found since, this statement, as alreadv 

 pointed out by Rostrup (1. c. p. 83, see note), is undoubtedly wrong. 



Order NEMASTOMACEAE. 

 FURCELLARIA Lamour. 



()('). F. fastigiata (L.) Lamour. Kjellm., N. I., p. 201 (158); Fur- 

 cellaria lumbricalis Lyngb., Hydrophyt., pp. 48 — 49. 



Found most frequently in the sublitloral zone, but also oceurs 

 dow and then in pools between tide-marks. It is most commonly 

 nul with in not very deep water, about 2 — 3 fathoms, in open 

 ravines and inlets »Skærgaarde«, in fairly exposed piaces where it 

 oceurs rather extensively in dense growths on stones and rocky bot- 

 loms. The greatest depth at which I gathered it was about 10 fathoms. 



All the spring and summer specimens which have been exa- 

 mined were sterile. Telrasporic specimens occurred abundantly in 



