▁research ers ▁have ▁been ▁able ▁to ▁isol ate ▁specific ▁species ▁and ▁stra ins ▁of ▁sym bi otic ▁orch id ▁my cor rh iz ae . ▁Using ▁this ▁technique ▁se eds ▁of ▁the ▁e pi ph yt ic ▁orch id ▁D end rob ium ▁a phy ll um ▁were ▁ ▁found ▁to ▁germ inate ▁to ▁seed lings ▁when ▁pa ired ▁with ▁fung al ▁stra ins ▁of ▁T ulas n ella , ▁ ▁however , ▁se eds ▁of ▁this ▁species ▁did ▁not ▁germ inate ▁when ▁treated ▁with ▁Tr ich oder ma ▁fung i ▁taken ▁from ▁adult ▁orch ids , ▁indicating ▁there ▁are ▁stage ▁specific ▁sym b ion ts . ▁These ▁fung al ▁sym b ios es , ▁as ▁well ▁as ▁their ▁aff inity ▁towards ▁ ▁specific ▁sym b ion ts , ▁vary ▁based ▁on ▁the ▁stage ▁of ▁development ▁and ▁age ▁of ▁the ▁host ▁roots . ▁As ▁an ▁orch id ▁ages ▁the ▁fung al ▁associations ▁become ▁more ▁complex . ▁ ▁Mix ot roph ic ▁orch ids ▁like ▁Ce phal an ther a ▁long ib ract e ata ▁ ▁may ▁associate ▁generally ▁with ▁several ▁fung i , ▁most ▁not ably ▁from ▁Russ ul aceae , Tr ich ol om ata ceae , ▁Seb ac inal es , ▁The le ph or aceae , ▁as ▁they ▁do ▁not ▁depend ▁as ▁heavily ▁on ▁the ▁fung us ▁for ▁carbon . ▁Some ▁orch ids ▁can ▁be ▁very ▁specific ▁in ▁their ▁sym b ion ts , ▁prefer ring ▁a ▁single ▁class ▁or ▁genus ▁of ▁fung i . ▁ ▁Gen ot ypes ▁of