Masi could mean the (bark of the) dye-fig (Ficus tinctoria), endemic to Oceania, and probably the one originally used to make tapa.
Ficus | Ficus religiosa | Isatis tinctoria | Ficus elastica | Ficus aurea | Ficus benghalensis | Roccella tinctoria | Opuntia ficus-indica | Indigofera tinctoria | Genista tinctoria | Ficus microcarpa | Ficus macrophylla | Ficus citrifolia | Alkanna tinctoria | Weinmannia tinctoria | Pollinating fig wasp (''Ceratosolen'' sp.) collected on ''Ficus septica | Ovipositing non-pollinating fig ''Apocrypta'' on Ficus sur | Morinda tinctoria | Maclura tinctoria | Leea tinctoria | Gunnera tinctoria | Ficus tinctoria | Ficus racemosa | ficus | Chrozophora tinctoria | Baptisia tinctoria |