You need to break down the lignin without damaging the cellulose. Boiling and mashing doesnt do this very well, you still get bundles of fibres sticking together, you really need them all to separate. The bonds holding lignins together are slightly different between grasses and wood. For grasses sodium carbonate or hydroxide dissolves the lignin pretty well (i havnt tried but you could probably get away with wood ash and some salt for this, to provide sodium and high ph), and allows you to make some pretty nice paper. This as far as i know includes things like papyrus, sugarcane etc. Wood is different, you need sodium hydroxide and sodium sulfate to dissolve the lignin. This contributes to the smell of the paper making process where wood is used. I dont think the ancients knew about the use of sulfates, so their papers were mostly made of grasses or leather (vellum).
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