How tall can Blechnum fraseri get?

Te Papa's Pat Brownsey is beginning to draft the eFloraNZ treatment for Blechnaceae, and he wants verified minima and maxima for quantifiable characteristics. We estimate the plant with me in the picture is c. 900 mm, which is the tallest we know of. Please tell me if you know of taller (preferably with pictures uploaded to NatureWatch!).

https://inaturalist.nz/observations/10135572

Posted on Μάρτιος 08, 2018 0829 ΠΜ by leonperrie