( ( Mychorrizal Fungi ) ( ( is ( ( a ( beneficial fungus ) ) ( that ( forms ( ( a relationship ) ( with ( ( the ( plants ' ) ) ( root system ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mychorrizal) (NNP Fungi)) (VP (VBZ is) (NP (NP (DT a) (JJ beneficial) (NN fungus)) (SBAR (WHNP (WDT that)) (S (VP (VBZ forms) (NP (NP (DT a) (NN relationship)) (PP (IN with) (NP (NP (DT the) (NNS plants) (POS ')) (NN root) (NN system))))))))) (. .)))
Mychorrizal Fungi is a beneficial fungus that forms a relationship with the plants' 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.