Asplenium sagittatum in Hampshire

The first picture shows the retaining wall of my patio with my neighbours garage wall behind it
The second picture shows the gap (about 7 inches) between my retaining wall and the garage
As you can see from the debris that has fallen down this gap, I don’t look down it very often. However, I did look a few months ago and noticed that several Asplenium scolopendriums and one plant that could be Asplenium adiantum-nigrum had spored themselves in this gap
In 2008 I had the whole garden rebuilt and the retaining wall was raised by about 18 inches. The plants seem to be growing at the base of where the addition to the retaining wall was built
Having a further look more recently, I realised that one of the “scolopendriums” looked odd. On closer examination, I began to suspect this plant was actually Asplenium sagittatum
Asplenium sagittatum is a fern that has a Mediterranean distribution, and I have seen it in Mallorca and Menorca. I have had a small plant growing unhappily in my conservatory for several years and I have to suppose that its spores made it outside. The outside plant is doing much better than the sad thing living in my conservatory.
The forth picture shows the sori and how they continue down into the lobe, which is typical of this species but not of A. scolopendrium
There are about 5 A. scolopendriums growing in the gap and possibly 3 A. sagittatums
I have sent these pictures to Fred Rumsey and he agrees with me that these plants look like Asplenium sagittatum
For the record, we get winter temperatures of -8C
I have some pictures of A. sagittatums from Menorca on my website

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