Plenasium javanicum is a fern in the family Osmundaceae.

[1] The genus Plenasium is recognized in the Pteridophyte Phylogeny Group classification of 2016 (PPG I);[2][3] however, some sources place all Plenasium species in a more broadly defined Osmunda, treating this species as Osmunda javanica.

[4] It has a wide native distribution in south-eastern Asia, being found in the Eastern Himalaya, south-central and south east China (including Hainan), Indochina, the Philippines, Borneo, Sumatra, Sulawesi and Java.

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