487 



with the examples ol* Ihis species distributed by Foslie in Wittr. 

 et Nordst., Exsicc, Nos. i.'iS and 642, which lie gathered in Kast 

 Finmarken, also on rocks by the sea. 



Found hitherto only on Str. : Tinganæs in Thorshavn (!). 



161. P. stipitata Suhr. Kjellm., N. I., p. 373 (303); Inilniuser, 

 Entwicklungsgeschichte und Formenkreis von Prasiola (Flora 18.s ( .)). 



Found on rocks and stones near high-water mark, and especially 



on exposed coasts at a considerable height above it. It grows gre- 



gariously and often carpets the rocks with a short, dense, almost 



moss-like growth. It is coinmon at landing and lishing piaces where 



lish are cleaned and dried, and as a whole in localities where there 



are organic remains, as e. g., piaces which are manured hy hirds, 



though it is far from heing exclusively conlined to such localities. 



Tliis species is vcry common along the coasts of the Færoes. 

 Slrangely enough, Lyngbye did not gather it, at least there is no 

 raaterial of it in his herbarium in Copenhagen, and, S i ni mon s's con- 

 jecture that Lyngbye's Ulva terrestris, found on rocks by the sea, is this 

 species, is not horne out by the laets (cfr. p. 4<SG above). 



Order ULVACEAE. 

 PERCURSARIA Bory. 



1(52. P. percursa (Ag.) Rosenv., Grønl. Havalg., p. 963. 



This plant occurred on flat, sheltered sea-shores intermixed 



with t ufts of Vaucheria. 



Found hitherto only on Str.: Sundelaget, al the narrow tide-way 

 north of Kvalvig (!). 



ENTEROMORPHA (Link). 



The systematic classification of this genus is, as is well known, 

 very unsettled, and the definitions of its species given by different 

 authors have varicd very considerahly. Until we have a monograph 

 of the genus Enteromorpha, based on experimental culture, I hardly 

 think that we shall arrive at any satisfactory conclusion concerning 

 it. Its great variety of forms can he understood when we consider 

 its occurrence, along a coast for example like that of the Færoes. 

 Thus, this genus is met with along coasts exposed to the fullesl 

 force of the breakers, and in the most sheltered localities; it grows 

 in piaces where the sea is in motion and the waler quite salt, and 

 in stagnant, hrackish-water often almost tepid, for example, in 

 rock-pools at high levels, having even been found in streams far 



