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She lus erbee 'sy rheynn Pteridophyta eh renniagh ny faarney. Ta mysh 12 000 dooie ayn.[2]. Ta sylem as phloem oc, as myr shen, she lossreeyn cuishlagh t'ayn. Ta gass, duillagyn as fraueyn oc, agh cha nel rassyn ny blaaghyn; t'ad geddyn sliught liorish sporragyn.
She Polypodiopsida possan smoo ny renniee, agh ta renniee goaill stiagh gollianee, renniee scuitçhee, Marattiopsida, as Ophioglossales.
Haink rish renniee 'sy recortys fossylagh 'syn Eash Charboniferagh, agh cha row ny dooieyn jeianagh ayn derrey anmagh 'syn Eash Chretaceagh son y chooid smoo.
Cha row monney feu tarmaynagh ec renniee, agh ta sleih troarey kuse jeu er son bee, jeshanaghey, ny er son yeehrullaghey thalloo sollit. Ta kuse jeu nyn sarkylyn scanshoil.