Dicksonia_lanata_6777_Maimai3 Posted 9 June 2012 by Leon Perrie & filed under . 2 Responses Leon Perrie April 17th, 2013 Hi Maurice, I have seen what you’re describing, at least in Dicksonia lanata and possibly in other Dicksonia too. I suspect that fertile parts of the frond age (and die) faster, as do fertile fronds compared to entirely sterile fronds. The effect is possibly more pronounced in the Dicksonia species with strongly dimorphic sterile and fertile laminae (e.g., http://blog.tepapa.govt.nz/2012/10/31/new-caledonian-ferns-with-close-relatives-in-new-zealand/dicksonia_thyrsopteroides_nc144_mandjelia5_reduced/), but I don’t have good photos of this as I avoid photographing dying/dead fronds! Leon Reply Maurice Wilkins April 17th, 2013 We have a large group of this fern at Arduaine Garden on the west coast of Scotland and I noticed last year what I thought were dying fronds and went to remove them. I then discovered that the large patches of brown tissue on the upper surface corresponded with the sori on the lower surface. I’d not seen this on a fern before. Reply Leave a Reply Click here to cancel reply. Name (required) Mail (required) (will not be published) Website Notify me of follow-up comments by email.