Oogenesis of Lygodium japonicum (Thunb.) Sw. is studied using and cytochemical techniques. The early development of the archegonia of L. japonicum is similar to those of the core-leptosporangiate ...

Premise of the Study: The monilophytes (ferns and relatives)—the third largest group of land plants—exhibit a diverse array of vegetative and reproductive morphologies. Investigations into their early ...

The principle of the evolutionary cul-de-sac is commonly invoked to explain the apparent lingering existence of once-diverse groups of organisms. Maybe that principle itself has had its day. Some ...

IN a book of some three hundred pages, beautifully produced and amply illustrated, Prof. Bower has now given us his considered views on the classification of the higher ferns. Both author and ...