▁will ▁not ▁be ▁dig ested , ▁or ▁at ▁least ▁not ▁as ▁readily . ▁R asm ussen ▁ 2 0 0 2 ▁discuss es ▁an ▁additional ▁mode ▁of ▁nut ri ent ▁transfer ▁called ▁p yt oph agy ▁involving ▁l ysis ▁of ▁fung al ▁cells ▁but ▁instead ▁of ▁l ys ing ▁the ▁entire ▁fung al ▁hy pha e ▁only ▁the ▁growing ▁end ▁is ▁de grad ed ▁re le asing ▁the ▁contents ▁of ▁the ▁fung al ▁cy top las m ▁into ▁the ▁inter fa cial ▁space ▁between ▁the ▁plant ▁and ▁fung i ▁memb ran es , ▁where ▁the ▁plant ▁can ▁u pt ake ▁the ▁necessary ▁comp ounds . ▁There ▁is ▁little ▁information ▁on ▁this ▁mode ▁of ▁nut ri ent ▁transfer ▁and ▁it ▁is ▁still ▁spec ulative , ▁and ▁more ▁research ▁is ▁needed . ▁ ▁Micro - nut ri ent ▁transfer ▁ ▁Micro - nut ri ent ▁transfer ▁is ▁thought , ▁for ▁the ▁most ▁part , ▁to ▁occur ▁by ▁pass ive ▁transport ▁across ▁cell ular ▁memb ran es , ▁both ▁during ▁absor ption , ▁from ▁soil ▁by ▁fung i , ▁and ▁transfer ▁from ▁fung i ▁to ▁host ▁plants . ▁This ▁is ▁not ▁always ▁the ▁case ▁though ▁and ▁although ▁research ▁on ▁the ▁topic ▁is ▁limited , ▁there ▁is ▁evidence ▁of ▁active ▁transport ▁and ▁allocation ▁of ▁micro - nut ri ents ▁in ▁certain ▁conditions . ▁The ▁up reg ulation ▁of ▁c ation ▁trans por ters ▁is ▁observed ▁in ▁orch id ▁D . ▁offic inale ▁sym b ios es , ▁suggesting ▁fung i ▁may ▁assist ed ▁in ▁the ▁transfer ▁of