Canadian Journal of Botany

Paleobotanical Studies in Arctic Canada I. Archaeopteris from Ellesmere Island - 1965

Azolla primaeva and its phylogenetic significance - 1967

Two new megaspore species from the continental Upper Cretaceous (Campanian-Maastrichtian) of the Alberta Plains - 1972

Vegetative remains of Azolla schopfii Dijkstra from Genesee, Alberta - 1973

A detailed study of the genus Azollopsis - 1974

A new fossil plant of probable intermediate affinities (Trimerophyte-Progymnosperm) - 1975

Rhymokalon, A New Plant with Cladoxylalean Anatomy from the Upper Devonian of New York State - 1975

New occurences of trimerophytes from the Devonian of eastern Canada - 1978

Ontogeny of Progymnosperms. II. Shoots of Upper Devonian Archaeopteridales - 1978

A new species of Psilophyton from the Lower Devonian of northern New Brunswick, Canada - 1980

Stenomyelon from the Upper Tournaisian of the Montagne Noire (France) - 1984

Fossil flowers and leaves of the Ebenaceae from the Eocene of southern Australia - 1985

Galtiera bostonensis, gen. et sp. nov., a protostelic calamopityacean from the New Albany shale of Kentucky - 1987

Gillespiea randolphensis gen. et sp. nov. (Stauropteridales), from the Upper Devonian of West Virginia - 1989

Catenalis digitata, gen. et sp. nov., a plant from the Lower Devonian (Siegenian) of Yunnan, China - 1991

Morphology and relationships of Mesocyparis umbonata sp. nov.: fossil Cupressaceae from the Late Cretaceous of Alberta, Canada - 1993

Sporophytes, megaspores, and massulae of Azolla stanleyi from the Paleocene Joffre Bridge locality, Alberta - 1994

An early Chamaecyparis (Cupressaceae) from the Late Cretaceous of Vancouver Island, British Columbia, Canada - 1994

A neotype for Drepanophycus spinaeformis Goppert 1852 - 2000

Fossil Flowers and Fruits of Capsular Myrtaceae from the Eocene of South Australia - 2007