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Flora Malesiana
KEY TO THE SUBSPECIES
1
Upper stipe, and often also rhachis and costae, deeply pigmented purplish black, at least on adaxial surface
Blechnum melanocaulon
subsp.
melanocaulon
1'
Upper stipe, rhachis and costae of mature sterile frond not deeply pigmented purplish black
Blechnum melanocaulon
subsp.
pallens
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