( ( Most ferns ) ( ( ( ( produce ( ( the ( same type ) ) ( of spores ) ) ) and ) ( are ( ( , ( therefore , ) ) homosporous ) ) ) . ) )
(ROOT (S (NP (JJS Most) (NNS ferns)) (VP (VP (VBP produce) (NP (NP (DT the) (JJ same) (NN type)) (PP (IN of) (NP (NNS spores))))) (CC and) (VP (VBP are) (ADJP (PRN (, ,) (ADVP (RB therefore)) (, ,)) (JJ homosporous)))) (. .)))
Most ferns produce the same type of spores and are, therefore, homosporous.
(ROOT (S (NP (JJS Most) (NNS ferns)) (VP (VP (VBP produce) (NP (NP (DT the) (JJ same) (NN type)) (PP (IN of) (NP (NNS spores))))) (CC and) (VP (VBP are) (ADVP (RB therefore)) (VP (VBN called) (NP (NNS homosporous))))) (. .)))