Atlas Of Ferns Of The British Isles

ASPIDIACEAE 79
0
6
5
0
26.2 x3
POLYSTICHUM
X BICKNELLII
26.2 x 1
®POLYSTICHUM
0
X ILLYRICUM
0 100
1
Kamen*
CHANNEL ISLANDS
Mies
9
PLOT TED ON 0 Wv
UTM GRID a
0
100
9
9 0
t:;)
/5
8
0
2
.6
1
e
1 2
26.2 x 1 Polystichum x illyricum
(Borbas) Hayek
(P.aculeatum x lonchitis)
This hybrid was first detected in herbarium material collected in
1932 from Glenade, v.c. H29 (A.Sleep & D.M.Synnott, Br.
Fern Gaz., 10: 281; 1972); it has since been collected alive and
awaits cytological confirmation. It is intermediate between the
parents although most similar, superficially, to P.aculeatum;
the spores are abortive. This hybrid is very difficult to separate
from P. x lonchitiforme if all three putative parents are in the
vicinity. The record from Inchnadamph, v.c. 108, is outside the
known range of P.setiferum however, and therefore is
undoubtedly P. x illyricum. (See A.McG.Stirling, Watsonia,
10: 231; 1974, and A.Sleep in C.A.Stace (ed.), Hybridization
and the Flora of the British Isles: 119; 1975).
2 3
3 4
9
8
Ni
0
N2
7
4
5 6
5 6
26.2 x 3 Polystichum x bicknellii
(Christ) Hahne
(P.aculeatum x setiferum)
A hybrid which appears frequently in habitats where the parents
grow close together. It can appear very similar to P.aculeatum
and is therefore very difficult to recognise. It is best confirmed
by abortive spores. (See A.Sleep in C.A.Stace (ed.), loc.cit.:
118).
Css
0
6
5
4
3
2
1
0