▁that ▁can ▁give ▁rise ▁to ▁new ▁plants . ▁The ▁fr onds ▁are ▁weak ly ▁dim orph ic , ▁the ▁fert ile ▁fr onds ▁being ▁slightly ▁larger ▁and ▁more ▁u pr ight . ▁ ▁Its ▁roots , ▁about ▁ 1   mill imeter ▁in ▁diameter , ▁are ▁ere ct ▁or ▁asc ending , ▁and ▁rarely ▁branch ed . ▁They ▁are ▁covered ▁with ▁dark ▁brown ▁to ▁black ish ▁scales , ▁which ▁are ▁linear ▁to ▁narrow ly ▁tri angular ▁in ▁shape ▁and ▁range ▁from ▁ ▁long ▁and ▁ 0 . 2 5 ▁to ▁ 0 . 4 5   mill im eters ▁wide . ▁The ▁st ipe ▁( the ▁st alk ▁of ▁the ▁leaf , ▁below ▁the ▁bla de ) ▁is ▁sh iny ▁and ▁re dd ish ▁to ▁pur pl ish ▁brown ▁in ▁color , ▁from ▁ ▁long , ▁and ▁la cks ▁wings . ▁The ▁rh iz ome ▁scales ▁continue ▁up ▁the ▁st ipe , ▁becoming ▁smaller ▁and ▁turning ▁into ▁hair s ▁higher ▁up . ▁The ▁length ▁of ▁the ▁st ipe ▁is ▁typically ▁from ▁ 2 0 % ▁to ▁ 1 0 0 % ▁of ▁the ▁leaf ▁bla de ▁length . ▁ ▁The ▁leaf ▁bl ades ▁are ▁spread ing ▁to ▁ere ct , ▁with ▁the ▁fert ile ▁fr onds ▁slightly ▁t aller ▁and ▁more ▁ere ct ▁than ▁the ▁ster ile ▁fr onds . ▁The ▁overall ▁shape ▁of ▁the ▁bl ades ▁is ▁narrow ly ▁tri angular ▁to ▁lance olate , ▁trunc ate ▁( squ ared ▁off ) ▁at ▁the ▁base , ▁r anging ▁from ▁ ▁long ▁and