The endemic piupiu (crown fern; Blechnum discolor), one of Aotearoa's most common ferns, grows abundantly along the No. 1 Line track, along with many other species of ferns. This photograph shows a typical view of the interior of the bush along the upper part of the track, with a large piupiu growing a few metres from the track. The fronds in the middle that look a bit like the bill of a sawfish are the fertile (spore-bearing) fronds.
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