Pteridospermatophyta, also called "pteridosperms" or "seed ferns" are a polyphyletic grouping of extinct seed-producing plants. The earliest fossil evidence...

Polypodiophyta †Progymnospermophyta Superdivision Spermatophyta †Pteridospermatophyta Pinophyta Cycadophyta Ginkgophyta Gnetophyta Magnoliophyta (angiosperms)...

Dayvaultia from the Late Jurassic of North America. "Seed ferns" (Pteridospermatophyta) is a collective term to refer to disparate lineages of fern like...

division of extinct seed-bearing plants (spermatophytes) known as Pteridospermatophyta. It is the only family in the monotypic order Calamopityales. This...

The Sachrang Formation or "Posidonienschiefer" Formation (Whose Vulgar name is "Posidonia Shale") is a geological formation of southwestern Germany, northern...

in the earliest, long-extinct gymnosperm group, the seed ferns (Pteridospermatophyta). The conifers or Pinophyta are one of four divisions of extant gymnosperms...

Lepidopteris callipteroides is a form species for leaves of Late Permian Pteridospermatophyta, or seed ferns, which lived from around 252 million years ago in...

Pecopteris and the tree ferns Megaphyton and Caulopteris. Seed ferns or Pteridospermatophyta include Cyclopteris, Neuropteris, Alethopteris, and Sphenopteris...

Pteridophyta (ferns & horsetails) Rhyniophyta (early plants) Gymnosperms Pteridospermatophyta (seed "ferns") Cycadophyta Ginkgophyta Gnetophyta Pinophyta (conifers)...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Order: †Medullosales Corsin, 1960 Families Alethopteridaceae Codonospermaceae...

Crossotheca is an extinct genus of seed ferns (Pteridospermatophyta) widespread in coal measures of Carboniferous, Permian and Triassic age, with possible...

Polypodiophyta – ferns and horsetails Seed plants (spermatophytes) †Pteridospermatophyta – seed ferns Pinophyta – conifers Cycadophyta – cycads Ginkgophyta...

Glossopteridales is an extinct order of seed plants, known from the Permian of Gondwana. They arose at the beginning of the Permian , and the majority...

is in the order Glossopteridales, which is placed in the division Pteridospermatophyta (often informally called "seed ferns"). In reality, many of the plant...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Class: †Lyginopteridopsida Order: †Lyginopteridales Family: †Lyginopteridaceae...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Class: †Lyginopteridopsida Order: †Lyginopteridales Families Moresnetiaceae...

Moresnetiaceae is a natural family of seed ferns in the Division Pteridospermatophyta that appears in the North American and European Devonian to Carboniferous...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Order: †Caytoniales Gothan, 1932 Family: †Caytoniaceae Kräusel, 1926...

Gigantopterids (Gigantopteridales) is an extinct, possibly polyphyletic group of seed plants known from the Permian period. Gigantopterids were among the...

Pteruchus is a form genus for pollen organs of the seed fern (Pteridospermatophyta family Umkomasiaceae. It was first described by Hamshaw Thomas from...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Order: †Caytoniales Family: †Caytoniaceae Genus: †Sagenopteris Species:...

Komlopteris is an extinct genus of "seed fern" with possible corystosperm affinities. Fossils have been found across both hemispheres, dating from the...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Order: †Caytoniales Family: †Caytoniaceae Genus: †Sagenopteris Species:...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Order: †Medullosales Family: †Neurodontopteridaceae Genus: †Neuropteris...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Order: †Caytoniales Family: †Caytoniaceae Genus: †Caytonia H.H.Thomas...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Order: †Medullosales Family: †Alethopteridaceae Genus: †Alethopteris...

Umkomasia macleanii is an ovulate structure of a seed fern (Pteridospermatophyta and the nominate genus of Family Umkomasiaceae. It was first described...

Corystosperms are a group of extinct seed plants (often referred to as "seed ferns") belonging to the family Corystospermaceae (also called Umkomasiaceae)...

recognized include: Lycopodiophyta, Arthrophyta, Pteridophyta, and Pteridospermatophyta. Fossils have been recovered from every rock type in the Llewellyn...

classification Kingdom: Plantae Clade: Tracheophytes Division: †Pteridospermatophyta Order: †Caytoniales Genus: †Caytonanthus Harris 1937 Species Caytonanthus...