487 
with the examples of this species distributed by Foslie in Wittr. 
et Nordst., Exsicc., Nos. 438 and 642, which he gathered in East 
Finmarken, also on rocks by the sea. 
Found hitherto only on Str.: Tinganaes in Thorshavn (!). 
161. P. stipitata Sulir. Kjellm., N. I., p. 373 (303); Imhauser, 
Entwicklungsgeschichte und Formenkreis von Prasiola (Flora 1889). 
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 common at landing and fishing places where 
fish are cleaned and dried, and as a whole in localities where there 
are organic remains, as e. g., places which are manured by birds, 
though it is far from being exclusively confined to such localities. 
This species is very common along the coasts of the Faeroes. 
Strangely enough, Lyngbye did not gather it, at least there is no 
material of it in his herbarium in Copenhagen, and, Simmons’s con¬ 
jecture that Lyngbye’s Viva terrestris , found on rocks by the sea, is this 
species, is not borne out by the facts (cfr. p. 486 above). 
Order ULVACEAE. 
PERCURSARIA Rory. 
162. P. percursa (Ag.) Rosenv., Gronl. Havalg., p. 963. 
This plant occurred on flat, sheltered sea-shores intermixed 
with tufts of Vaucheria. 
Found hitherto only on Str.: Sundelaget, at 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 varied very considerably. 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 be understood when we consider 
its occurrence, along a coast for example like that of the Faeroes. 
Thus, this genus is met with along coasts exposed to the fullest 
force of the breakers, and in the most sheltered localities; it grows 
in places where the sea is in motion and the water quite salt, and 
in stagnant, brackish-water often almost tepid, for example, in 
rock-pools at high levels, having even been found in streams far 
