Atlas Of Ferns Of The British Isles
Atlas Of Ferns Of The British Isles
Atlas Of Ferns Of The British Isles
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AZOLLACEAE 99<br />
0<br />
5<br />
0<br />
8<br />
30.1<br />
AZOLLA<br />
FILICULOIDES<br />
Water Fern<br />
0 100<br />
Kilometres<br />
0 100<br />
CHANNEL ISLANDS<br />
Mdes<br />
9<br />
PLOT TED ON 0 wv<br />
UTM GRID<br />
9<br />
9 0<br />
i3<br />
8<br />
2<br />
,47<br />
6 6<br />
3<br />
9<br />
8<br />
8 0<br />
N1<br />
0<br />
7 5<br />
o<br />
0 : 00 0<br />
_.<br />
gee<br />
1 2 3 4 5 6<br />
30.1 Azolla filiculoides Lam.<br />
Regarded by most botanists as having been introduced into<br />
Europe from tropical America. It is certainly well-established<br />
here and shows signs of increasing in Britain (cf. map 27/1,<br />
p.15, in the 1962 edition of the <strong>Atlas</strong> of the <strong>British</strong> Flora, with<br />
the above). With the present trend in eutrophication of ponds<br />
and inland waters it is difficult to explain this increase. Possibly<br />
the increased drainage operations have created more ditches<br />
and similar open water in drainage channels which have in turn<br />
become colonised. It suddenly, and inexplicably, disappears,<br />
often to return some five or ten years later.<br />
N2<br />
4 6<br />
0<br />
0<br />
5<br />
4<br />
3<br />
2<br />
0
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