( ( The ( male gametophyte ) ) ( ( ( is ( the ( mature ( pollen grain ) ) ) ) ( while ( ( the ( female gametophyte ) ) ( is ( ( ( the ( embryo sac ) ) , ) ( located ( in ( the ovule ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ male) (NN gametophyte)) (VP (VBZ is) (NP (DT the) (JJ mature) (NN pollen) (NN grain)) (SBAR (IN while) (S (NP (DT the) (JJ female) (NN gametophyte)) (VP (VBZ is) (NP (NP (DT the) (NN embryo) (NN sac)) (, ,) (VP (VBN located) (PP (IN in) (NP (DT the) (NN ovule))))))))) (. .)))
The male gametophyte is the mature pollen grain while the female gametophyte is the embryo sac, located in the ovule.
(ROOT (S (NP (NP (DT A) (NN grain)) (PP (IN of) (NP (NN pollen)))) (VP (MD can) (VP (VB be) (VP (VBN described) (PP (IN as) (NP (NP (DT a) (JJ tiny) (JJ male) (NN gametophyte)) (VP (VBN enclosed) (PP (IN in) (NP (DT a) (JJ tough) (NN capsule))))))))) (. .)))