Current status of the Progymnospermopsida

The Identity of Archaeopteris and Callixylon

1960 • 158 citations

The ontogeny of Carboniferous arborescent Lycopsida

1961 • 144 citations

THE APPEARANCE OF GYMNOSPERMOUS STRUCTURE

1970 • 111 citations

ANATOMY AND RELATIONSHIPS OF SOME DEVONIAN PROGYMNOSPERMS FROM NEW YORK

1971 • 88 citations

TETRAXYLOPTERIS SCHMIDTII GEN. ET SP. NOV., A PROBABLE PTERIDOSPERM PRECURSOR FROM THE DEVONIAN OF NEW YORK

1957 • 84 citations

A COMPARATIVE STUDY OF THE PRIMARY VASCULAR SYSTEM OF CONIFERS. III. STELAR EVOLUTION IN GYMNOSPERMS

1968 • 73 citations

RECONSTRUCTIONS OF ARCHAEOPTERIS, AND FURTHER CONSIDERATION OF ITS PHYLOGENETIC POSITION

1962 • 72 citations

ARCHAEOPTERIS MACILENTA, ANATOMY AND MORPHOLOGY OF ITS FROND

1966 • 72 citations

Archaeosperma arnoldii-A Cupulate Seed from the Upper Devonian of North America

1968 • 70 citations

A COMPARATIVE STUDY OF THE PRIMARY VASCULAR SYSTEM OF CONIFERS. I. GENERA WITH HELICAL PHYLLOTAXIS

1968 • 68 citations

Connection between Archaeopteris and Callixylon

1960 • 64 citations

An apparently heterosporous plant from the Middle Devonian of New Brunswick

1974 • 63 citations

HETEROSPORY AND THE ORIGIN OF THE SEED HABIT

1970 • 62 citations

TETRAXYLOPTERIS SCHMIDTII: ITS FERTILE PARTS AND ITS RELATIONSHIPS WITHIN THE ANEUROPHYTALES

1967 • 62 citations

PROTEOKALON A NEW GENUS OF PROGYMNOSPERMS FROM THE DEVONIAN OF NEW YORK STATE AND ITS BEARING ON PHYLOGENETIC TRENDS IN THE GROUP

1971 • 59 citations

Rhacophyton from the Upper Devonian of West Virginia

1968 • 58 citations

Une association de spores du Givétien Inférieur de la Vesdre, à Goé (Belgique).

1964 • 58 citations

Beiträge zur Kenntnis der Devonflora

1926 • 53 citations

THE MORPHOLOGY AND RELATIONSHIPS OF RHODEA, TELANGIUM, TELANGIOPSIS, AND HETERANGIUM

1976 • 50 citations

ON THE ANATOMY AND MORPHOLOGY OF LATERAL BRANCH SYSTEMS OF ARCHAEOPTERIS

1971 • 48 citations

IX. On fossil plants, showing structure, from the base of the waverley shale of Kentucky

1914 • 47 citations

COMPARATIVE MORPHOLOGY OF THE PRIMARY VASCULAR SYSTEMS IN SOME SPECIES OF ROSACEAE AND LEGUMINOSAE

1972 • 44 citations

X.—Some Specimens of Lyginorachis papilio Kidston Associated with Stems of Pitys

1963 • 43 citations

Two heterosporous plants from the Upper Devonian of North America

1965 • 43 citations

A COMPARATIVE STUDY OF THE PRIMARY VASCULAR SYSTEM OF CONIFERS. II. GENERA WITH OPPOSITE AND WHORLED PHYLLOTAXIS

1968 • 41 citations

XV.—On Protopitys (Göppert): with a Description of a Fertile Specimen Protopitys scotica sp. nov. From the Calciferous Sandstone Series of Dunbartonshire.

1958 • 41 citations

Observations on Fossil Plants from the Devonian of Eastern North America. IV. Plant Remains from the Catskill Delta Deposits of Northern Pennsylvania and Southern New York

1939 • 37 citations

Anatomy and Relationships of Some Devonian Progymnosperms from New York

1971 • 37 citations

ACTINOXYLON BANKSII GEN. ET SP. NOV.: A PROGYMNOSPERM FROM THE MIDDLE DEVONIAN OF NEW YORK

1968 • 35 citations

ON THE ORIGIN OF GYMNOSPERMS

1966 • 35 citations

A Devonian flora from Kentucky

1936 • 34 citations

PALEOBOTANICAL STUDIES IN ARCTIC CANADA: I. ARCHAEOPTERIS FROM ELLESMERE ISLAND

1965 • 33 citations

Eddya sullivanensis , gen. et sp. nov., a Plant of Gymnospermic Morphology from the Upper Devonian of New York

1967 • 32 citations

Tetraxylopteris Schmidtii Gen. Et sp. Nov., A Probable Pteridosperm Precursor from the Devonian of New York

1957 • 32 citations

Archaeopteris macilenta, Anatomy and Morphology of Its Frond

1966 • 30 citations

RELLIMIA THOMSONII, A NEW NAME FOR MILLERIA (PROTOPTERIDIUM) THOMSONII LANG 1926 EMEND. LECLERCQ AND BONAMO 1971

1973 • 29 citations

Reconstructions of Archaeopteris, and Further Consideration of its Phylogenetic Position

1962 • 27 citations

Tetraxylopteris Schmidtii: Its Fertile Parts and Its Relationships Within the Aneurophytales

1967 • 26 citations

THE CAIRO FLORA (GIVETIAN) FROM EASTERN NEW YORK. I. REIMANNIA, TERETE AXES, AND CAIROA LAMANEKII GEN. ET SP. N.

1973 • 26 citations

TRILOBOXYLON ASHLANDICUM GEN. AND SP. N. FROM THE UPPER DEVONIAN OF NEW YORK

1966 • 24 citations

On the Anatomy and Morphology of Lateral Branch Systems of Archaeopteris

1971 • 24 citations

Relationship between the Devonian Progymnosperm Genera Sphenoxylon and Tetraxylopteris

1967 • 24 citations

Proteokalon a New Genus of Progymnosperms from the Devonian of New York State and Its Bearing on Phylogenetic Trends in the Group

1971 • 23 citations

A Comparative Study of the Primary Vascular System of Conifers. III. Stelar Evolution in Gymnosperms

1968 • 22 citations

Plants of the New Albany Shale. II. Callixylon Arnoldii Sp. Nov.

1962 • 21 citations

A Comparative Study of the Primary Vascular System of Conifers. I. Genera with Helical Phyllotaxis

1968 • 19 citations

Devonian plants from fair Isle, Scotland

1972 • 18 citations

Triloboxylon Ashlandicum Gen. and Sp. N. from The Upper Devonian of New York

1966 • 16 citations

Bark Structure of Callixylon

1930 • 16 citations

Comparative Morphology of the Primary Vascular Systems in Some Species of Rosaceae and Leguminosae

1972 • 16 citations

STELAR EVOLUTION IN VASCULAR PLANTS

1971 • 15 citations

Actinoxylon Banksii Gen. et Sp. Nov.: A Progymnosperm from the Middle Devonian of New York

1968 • 15 citations

ON THE STRUCTURE OF A SILICIFIED STEM OF PROTOPITYS AND ROOTS ASSOCIATED WITH IT FROM THE CARBONIFEROUS LIMESTONE, LOWER CARBONIFEROUS (MISSISSIPPIAN) OF YORKSHIRE, ENGLAND

1969 • 11 citations

On the Structure of a Silicified Stem of Protopitys and Roots Associated with It from the Carboniferous Limestone, Lower Carboniferous (Mississippian) of Yorkshire, England

1969 • 10 citations

The Cairo Flora (Givetian) from Eastern New York. I. Reimannia, Terete Axes, and Cairoa lamanekii Gen. Et Sp. N.

1973 • 10 citations

A Comparative Study of the Primary Vascular System of Conifers. II. Genera with Opposite and Whorled Phyllotaxis

1968 • 9 citations