Atlas Of Ferns Of The British Isles

16 EQUISETACEAE
0 1 2 3 4
0 0
0
6
5
7.1x2
EQUISETUM
X TRACHYODON 9 9
I?
Kipmene
Miles
9
CHANNEL GLANDS
PLOT TED ON 0 wv
UTM GRID
100
I AC0
0
0
100
0
8
8
2
.0
1 2
7.1 x 2 Equisetum X trachyodon A.Braun
(E.hyemale x variegatum)
A hybrid with a distinct Atlantic distribution which however
may be under-recorded on the European mainland. The
E.variegatum parent is most likely the lowland (and often
coastal) ecotype of that species and the hybrid is therefore more
rare in Scotland where the mountain form predominates than
the distribution of the parent species would suggest. Some
previously reported records from Ireland have proved to be
forms of E.variegatum. Small plants may be separated from
that species by the long sheath and the long teeth with narrow
membraneous margins; the cones have abortive spores (see
J.G.Duckett & C.N.Page, in C.A.Stace (ed.), loc.cit.: 100).
3 4
-(2
8
Ni
0
7
5
HX
HW
N2
5 6
4
6
6
5
4
3
2
1