Asplenium azoricum
A small, tufted rock fern found only in the Azores. It is an allotetraploid of hybrid origin between the Macaronesian Asplenium anceps and a member of the A. trichomanes complex. It looks like a maidenhair spleenwort with leathery, almost plastic-like pinnae on a glossy, dark garnet rachis, and it grows in the crevices of volcanic rock and old terrace walls, usually on shaded north- to north-west-facing faces. It needs a mild, humid, frost-free oceanic climate, not tropical heat.
Where it grows wild
It grows among the stones of terrace walls and in crevices of volcanic rock, mostly on faces oriented north to north-west. The roots sit in a thin layer of moss, lichen and grit in the crevice. Plants in more sun develop thicker, more leathery fronds.
Many observations come from lowland villages and farmland (Graciosa, Santa Maria, Pico), so it is common near sea level. Exact elevations are not given in the sources we read.
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The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY 3.0 licence, unmodified.