একটি বিলুপ্ত বীজ উত্পাদক অর্ডার Cycadofilicales এর fernlike উদ্ভিদ (অথবা গ্রুপ Pteridospermae

pteridosperm's Usage Examples:

Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous Period, though some pteridosperm-like plants.

varied Permian flora in the Britain and is the type locality for the pteridosperm Pseudoctensis middridgensis.

geological interest, principally the fluvial sandstone which has yielded pteridosperm seeds, known as Trigonocarpus.

Devonian times the aneurophytaleans are presumed to have given rise to the pteridosperm order, the Lyginopteridales.

archetypal pteridosperms: They were the first plant fossils to be described as pteridosperms and, thus, the group on which the concept of pteridosperms was first.

were: Sigillaria Lepidodendron Calamites pteridosperms Genera recorded in Great Britain include: Pteridosperm leaves: Alethopteris, Callipteridium, Cyclopteris.

is a Mesozoic pteridosperm leaf fossil probably belonging to the seed fern Order Peltaspermales.

The fossil pteridosperm genus Boulayatheca bears his name, as does the bryophyte genus Boulaya.

"The Peltaspermaceae, a pteridosperm family of Permian and Triassic age".

The Emplectopteridaceae were pteridosperms known mainly from Permian floras of the Cathaysian Realm.

Beck described the genus as possibly a precursor to the seed ferns or pteridosperms.

modern-day Australia suggest a flora dominated by different types of pteridosperms with pockets of isoetoid lycopsids.

The Callistophytaceae was a family of seed ferns (pteridosperms) from the Carboniferous and Permian periods.

period, the land became dominated by seed plants such as Glossopteris, a pteridosperm which grew in swamps.

would lead to the conclusion that both groups arose from within the pteridosperms, probably as early as the Permian.

They later became known as the pteridosperm.

Greek πτερίς, πτερίδος (pterís, pterídos) pteridology, pteridophyte, pteridosperm pto- fall Greek πίπτειν (píptein), πτωτός (ptōtós), πτωτικός (ptōtikós).

pteridosperm's Meaning':

an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae