( ( Many ( of ( ( these types ) ( of fungi ) ) ) ) ( ( form ( highly ( specialized ( , ( mutually ( beneficial ( associations ( called ( Mycorrhizae ( with ( ( the roots ) ( of ( living trees ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Many)) (PP (IN of) (NP (NP (DT these) (NNS types)) (PP (IN of) (NP (NNS fungi)))))) (VP (VBP form) (ADJP (RB highly) (JJ specialized) (, ,) (RB mutually) (JJ beneficial) (SBAR (S (NP (NNS associations)) (VP (VBD called) (NP (NP (NNP Mycorrhizae)) (PP (IN with) (NP (NP (DT the) (NNS roots)) (PP (IN of) (NP (VBG living) (NNS trees))))))))))) (. .)))
Many of these types of fungi form highly specialized, mutually beneficial associations called Mycorrhizae with the roots of living trees .
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN beneficial) (NN relationship)) (VP (VBZ exists) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT a) (JJ certain) (NN type)) (PP (IN of) (NP (NP (NN tree) (POS 's)) (NNS roots)))) (VP (VBP need) (S (NP (DT a) (NN fungus)) (VP (VB present) (SBAR (IN in) (NN order) (S (VP (TO to) (VP (VB grow) (ADVP (RB normally)))))))))))) (. .)))
A(n) beneficial relationship exists when a certain type of tree’s roots need a fungus present in order to grow normally.