( ( The fungus ) ( ( is ( ( transmitted ( to ( the trees ) ) ) ( ( ( during ( periods ( of ( ( ( high ( relative humidity ) ) , ) ( which ( is ( ( much ( more common ) ) ( in ( a ( maritime climate ) ) ) ) ) ) ) ) ) ) ( rather than ) ) ( in ( ( the ( continental climate ) ) ( found ( in ( the GYA ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN fungus)) (VP (VBZ is) (VP (VBN transmitted) (PP (TO to) (NP (DT the) (NNS trees))) (PP (PP (IN during) (NP (NP (NNS periods)) (PP (IN of) (NP (NP (JJ high) (JJ relative) (NN humidity)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (ADJP (RB much) (RBR more) (JJ common)) (PP (IN in) (NP (DT a) (JJ maritime) (NN climate))))))))))) (CONJP (RB rather) (IN than)) (PP (IN in) (NP (NP (DT the) (JJ continental) (NN climate)) (VP (VBN found) (PP (IN in) (NP (DT the) (NNP GYA))))))))) (. .)))
The fungus is transmitted to the trees during periods of high relative humidity, which is much more common in a maritime climate rather than in the continental climate found in the GYA.
(ROOT (S (NP (PRP One)) (VP (MD might) (VP (VB find) (NP (JJ deciduous) (NNS trees)) (PP (IN in) (NP (DT a) (JJ humid) (JJ continental) (NN climate))))) (. .)))