Dear colleagues, i got one growth variant of
Polystichum aculeatum which has been planted by me at the small, shady "stone garden" at my parents' propperty in Styria, Austria.
In case i do remember right i had found the variant with striking slender pinnulae in the gorge Badl-Klamm some decades ago, but i never found another like that again.
The fern does still grow well, having very rigid fronds as typical with
P. aculeatum but not
P. setiferum of which i do know variants looking pretty the same.
Its pinnulae are clearly smaller and narrower than with typical
P. aculeatum, as you can compare at the first image i am going to show you.
As i did not find a matching cultivar at the forum, i chose to present it here. Perhaps such growth types got their own cultivar name, as i do expect.
I liked to grow new plants from spores, although i don't know if these will be viable, or if the progeny looked the same, or like usual wild types.
When taking photos i saw that spores will likely have been shed by now, so it was too late to collect and sow them.