
New Zealanders are pretty familiar with the koru, an unfurling fern frond. But Australia’s prickly tree fern, Cyathea leichhardtiana, does it a bit differently. It unfurls the leafy parts of a frond only after the “stem” parts of the frond (technically the rachis and the costae) are nearly fully extended. Photo by Leon Perrie. © Te Papa.Read more