Rather than create more incredibly specialized plants to give the Aldryami a writing surface, how about they use some more common materials.
Birchbark is well known for its paper-like qualities. The aldryami may cultivate the trees to provide better quality. Naturally they harvest only the outer bark layers to prevent any harm to the tree.
In wet regions, the aldryami might harvest papyrus or similar reeds to make into a paper substitute.
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