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Macroneuropteris scheuchzeri has been extensively gured and called by many different names, particularly in the European literature, since the species was erected in 1699. Much of the nature of this arborescent-medullosalean tree still remains to be documented, i.e., fructication, trunk, root, and frond architecture, but its heterophyllous foliage is well known. Based on the large macrofossil collections from the Pennsylvanian Sydney Coaleld, Nova Scotia, Canada, it is possible to present an overall view of the diverse foliar nature of this remarkable medullosalean tree. Suggestions are offered as to how the many foliar forms t into the bipinnate frond of Laveine and Brousmiche (1982). RESUME Le Macroneuropteris scheuchzeri a ete abondamment decrit et a ete appele de nombreux noms differents, en particulier dans la documentation europeenne, car l'espece a ete etablie en 1699. Il reste encore a documenter une vaste part de la nature de cet arbre arborescent-medullosaleen, c.-a-d. la fructication, le tronc, les racines et l'architecture des frondes, mais on connait bien son feuillage heterophylle. Il est possible, en se basant sur les grandes collections de macrofossiles du terrain houiller pennsylvanien de Sydney, Nouvelle-Ecosse, Canada, de presenter un apercu de la nature foliaire diversiee de ce remarquable arbre medullosaleen. Des hypotheses sont avancees sur la facon dont les nombreuses formes foliaires s'inserent dans la fronde bipennee de Laveine et Brousmiche (1982).

Foliar forms of Macroneuropteris scheuchzeri (Pennsylvanian, Sydney Coalﬁeld, Nova Scotia, Canada)