ι π ος ▁( r hip os , ▁w icker work , ▁referring ▁to ▁the ▁long ▁sho ots ) ▁and ▁ γ ο ν υ ▁( gon u , ▁joint ed ), ▁from ▁the ▁joint ed ▁appearance ▁of ▁the ▁st ems . ▁Because ▁the ▁Greek ▁word ▁ ῥ ι π ος ▁begins ▁with ▁an ▁asp ir ate ▁r ho ▁rather ▁than ▁plain ▁r ho , ▁classical ▁sch ol ars ▁preferred ▁to ▁trans cribe ▁it ▁with ▁rh - ▁rather ▁than ▁r -. ▁Con sequently , ▁some ▁early ▁botan ists ▁treated ▁the ▁For sters ' ▁sp elling ▁as ▁an ▁error ▁to ▁be ▁corrected ▁and ▁the ▁sp elling ▁R hip og on um ▁was ▁used . ▁Which ▁sp elling ▁is ▁correct ▁depends ▁on ▁the ▁interpretation ▁of ▁Article ▁ 6 0 ▁of ▁the ▁International ▁Code ▁of ▁N omen cl ature ▁for ▁alg ae , ▁fung i , ▁and ▁plants , ▁which ▁recomm ends ▁that ▁the ▁classical ▁trans cription ▁rules ▁should ▁be ▁followed ▁when ▁forming ▁new ▁names ▁( Rec . ▁ 6 0 A ) ▁and ▁also ▁that ▁" the ▁original ▁sp elling ▁of ▁a ▁name ▁or ▁ep ith et ▁is ▁to ▁be ▁retained , ▁except ▁for ▁the ▁correction ▁of ▁typ ographical ▁or ▁orth ographical ▁errors ". ▁It ▁has ▁been ▁stated ▁that ▁the ▁For sters ' ▁sp elling ▁is ▁probably ▁deliber ate ▁and ▁should ▁not ▁be ▁li able ▁to ▁correction ▁in ▁the ▁same ▁way ▁as ▁an ▁accident al ▁typ ographical ▁error ▁would ▁be . ▁The ▁International ▁Plant ▁Names ▁Index ▁tre ats ▁the ▁sp elling ▁R hip og on