( ( In ferns ) ( , ( ( as ( for ( other pteridophytes ) ) ) ( , ( ( the sporophyte ) ( ( ( is ( ( the ( dominant generation ) ) ( to ( the extent ) ) ) ) ( that ( this ( is ( ( the generation ) ( recognised ( as ( a fern ) ) ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN In) (NP (NNS ferns))) (, ,) (PP (RB as) (IN for) (NP (JJ other) (NNS pteridophytes))) (, ,) (NP (DT the) (NN sporophyte)) (VP (VBZ is) (NP (NP (DT the) (JJ dominant) (NN generation)) (PP (TO to) (NP (DT the) (NN extent)))) (SBAR (IN that) (S (NP (DT this)) (VP (VBZ is) (NP (NP (DT the) (NN generation)) (VP (VBN recognised) (PP (IN as) (NP (DT a) (NN fern))))))))) (. .)))
In ferns, as for other pteridophytes, the sporophyte is the dominant generation to the extent that this is the generation recognised as a fern.
(ROOT (S (NP (DT The) (JJ sporophyte) (NN stage)) (VP (VBZ is) (NP (NP (DT the) (JJ dominant) (NN stage)) (PP (IN of) (NP (NP (DT the) (NN lifecycle)) (PP (IN of) (NP (DT a) (NN fern))))))) (. .)))