▁Description ▁ ▁The ▁cap ▁is ▁flat ▁when ▁young , ▁with ▁a ▁bl unt , ▁rounded ▁and ▁yellow ish - white ▁margin , ▁later ▁with ▁a ▁slightly ▁de pressed ▁centre ▁and ▁cont oured ▁in ▁a ▁wave ▁pattern ▁towards ▁the ▁rim , ▁ ▁which ▁has ▁a ▁rather ▁sharp ▁edge ▁when ▁old . ▁It ▁is ▁covered ▁in ▁felt ▁that ▁is ▁grey ▁when ▁young ▁and ▁rust y ▁brown ▁when ▁old , ▁up ▁to ▁ ▁in ▁diameter . ▁The ▁stem ▁is ▁short ▁and ▁thick , ▁dark ▁brown ▁to ▁almost ▁black . ▁The ▁flesh ▁is ▁hard ▁and ▁f ibr ous , ▁and ▁och re ▁brown ▁under ▁the ▁cap ▁surface . ▁ ▁Most ▁commer cially ▁important ▁con if ers ▁in ▁Canada , ▁including ▁white ▁spr uce , ▁are ▁attacked ▁by ▁In on ot us ▁t oment os us ▁( Fr .) ▁T eng ▁also ▁known ▁as ▁On nia ▁t oment osa ▁( Wh it ney ▁ 1 9 7 8 ). ▁This ▁fung us ▁produces ▁a ▁white ▁pocket ▁rot ▁commonly ▁called ▁T oment os us ▁root ▁rot ▁in ▁both ▁roots ▁and ▁but ts ▁of ▁naturally ▁seed ed ▁or ▁plant ed ▁con if ers . ▁White ▁spr uce ▁and ▁black ▁spr uce ▁were ▁found ▁to ▁be ▁the ▁ 2 ▁most ▁sus cept ible ▁species ▁in ▁an ▁in oc ulation ▁test ▁in ▁S ask atch ew an ▁( Wh it ney ▁ 1 9 6 4 ), ▁and ▁high ▁losses ▁to ▁root ▁rot , ▁in ▁large ▁part ▁due ▁to ▁I . ▁t oment os us , ▁affected ▁white ▁spr uce ▁plant ations