Blechnum novae-zelandiae, kiokio. Most Blechnum species have different looking fertile (top left) and sterile fronds. Fertile Blechnum fronds are usually reduced to narrow segments, which are green when young, black when the spores are mature, and brown after the spores have been shed. Most Blechnum species also have only once-divided fronds. Photo Leon Perrie. © Te Papa.

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