( ( ( ( ( ( ( The ( third ( major group ) ) ) ( of fungi ) ) ( ( is again ) ( associated ( with ( certain trees ) ) ) ) ) , ) but ) ( ( rather ( than ( harming ( the trees ) ) ) ) ( , ( they ( ( are often ) ( beneficial ( ( forming ( an ( intimate relationship ) ) ) ( with ( ( the ( tree 's ) ) ( root system ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (JJ third) (JJ major) (NN group)) (PP (IN of) (NP (NNS fungi)))) (VP (VBZ is) (ADVP (RB again)) (VP (VBN associated) (PP (IN with) (NP (JJ certain) (NNS trees)))))) (, ,) (CC but) (S (PP (RB rather) (IN than) (S (VP (VBG harming) (NP (DT the) (NNS trees))))) (, ,) (NP (PRP they)) (VP (VBP are) (ADVP (RB often)) (ADJP (JJ beneficial) (S (VP (VBG forming) (NP (DT an) (JJ intimate) (NN relationship)) (PP (IN with) (NP (NP (DT the) (NN tree) (POS 's)) (NN root) (NN system)))))))) (. .)))
The third major group of fungi is again associated with certain trees, but rather than harming the trees, they are often beneficial forming an intimate relationship with the tree's root system.
(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.