Peltaspermaceae

Peltaspermaceae is a natural family of seed ferns (Pteridospermatophyta) widespread in both northern and southern hemispheres coal measures of Permian and Triassic age.[1]

Peltaspermaceae
Temporal range: Middle Permian–Late Triassic
Lepidopteris madagascariensis leaf from Early Triassic Newport Formation, near Sydney, Australia.
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Division: †Pteridospermatophyta
Order: †Peltaspermales
Family: †Peltaspermaceae
Thomas 1933
Genera
  • Peltaspermum ovulate structures
  • Antevsia pollen organs
  • Lepidopteris leaves

Description

Peltaspermaceae have umbrella-like (peltate) cupules with numerous pendant ovules born in complex large branching structures (Peltaspermum). The pollen organ (Antevsia) has radiating cigar-shaped pollen sacs attached to small blades, again in complex branching structures. The leaves (Lepidopteris) are bipinnate to tripinnate with small pinnules on the rachis.

gollark: The Ten Metre Island power line is complete!
gollark: I'm going to run redstone fluxducts, which may work out cheaper since no nickel.
gollark: The library is looking pretty nice.
gollark: I have somehow missed this.
gollark: What library?

References
  1. Thomas, H.H. (1933). "On some pteridospermous plants from the Mesozoic rocks of South Africa". Philosophical Transactions of the Royal Society B. 222 (483–493): 193–265. doi:10.1098/rstb.1932.0016.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.