322 
E. Jorgensen. 
owing to a somewhat different origin. Thus it seems natural . 
to assume that our northern E. latifolia has immigrated in 
an early cold age from the nord-east (Finland and Northern 
Russia), whilst E. minima might be of a more southern 
origin. Considering the close relations of both species it 
appears, however, as probable that both have reached their 
present wide distribution during the subatlantic rough age, 
E. latifolia from a more or less discontinuous northern 
region of distribution, E. minima from a similar more southerly 
one. This supposition would also account for the great 
many forms of both, as the originally continuous distribution 
very probably has been broken in geological ages with a 
milder climate, viz. the Atlantic age and the subboreal of 
Bly tt. 
The peculiar v. inundata -- closely allied to E. bottnica 
Kihlm. — has been mentioned above. — 
E. scotica Wettst. (E. paludosa Towns. olim). Intermediate 
between E. minima and the following species, not distinguished 
with any certainty from either of them, though as a rule 
easily recognized. Only found in Western Norway in wet 
places, from 58° 15: N to 62° 15’, and in a førere 
northerly places, to 64° 40‘. Otherwise only known from 
the British Isles and the Færöes. May be a hygrophile 
form of E. micrantha Rchb., with transitional forms in drier 
localities. The species appears as a connecting link between 
E. minima and E. micrantha and seems to indicate a close 
relationship between these two species. It might therefore 
perhaps be assumed that E. minima and E. micrantha have 
a common origin from a species which lived in the last or 
some preceding ice-age, this species dividing into the present 
E. minima in a rough climate and E. micrantha @aingee 
milder one. 
E. micrantha Rchb. (E. gracilis Fries). More or less con- 
tinuously distributed along the coast, from Lyngör on the 
south-east coast to the polar circle. Also occurs in the south- 
eastern corner of the country, near the Swedish border. 
Usually only found near the coast; at inland localities gene- 
rally subalpine. At a greater distance from the coast only 
found in Setesdal. Generally speaking a comparatively con- 
stant and easily distinguished species, with a distinctly xero- 
