Crossotheca

Crossotheca is an extinct genus of seed ferns (Pteridospermatophyta) widespread in coal measures of Carboniferous, Permian and Triassic age, with possible Devonian remains known from Belgium. The type species is C. crepini, named and described in 1883 by R. Zeiller, and the genus is known from fossils found in Belgium (?), Canada, China, England, France, Hungary, Ireland, Poland and the United States.

Crossotheca
Temporal range: Carboniferous-Triassic,
Specimen P 30369 (left) and the pollen bearing organs of C. hughesiana from Dudley, England
Reconstruction of C. höninghausi
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Division: †Pteridospermatophyta
Class: †Lyginopteridopsida
Order: †Lyginopteridales
Genus: †Crossotheca
Zeiller (1883)
Species
  • †C. boulayi Zeiller (1883)
  • †C. communis Lesquererfx
  • †C. crepini Zeiller (1883)
  • †C. fimbriata Kidston (1906)
  • †C. grievii Potonie (1954)
  • †C. höninghausi Johnson & Kidston (1911) [originally Sphenopteris]
  • †C. hughesiana Kidston (1906)
  • †C. kentuekiensis Stubbefield, Taylor & Daghlian (1982)
  • †C. kidstom? (nomen dubium)
  • †C. kidstoni Crookall
  • †C. pinnatifida Gutbier
  • †C. sagittata Lesquererfx
  • †C. schatzlarensis
  • †C. reniformis
  • †C. trichomanoides
  • †C. trisecta Sellards
Synonyms

One species, C. höninghausi, is the male fructification of Lyginodendron oldhami and the same species is the microsporangia-bearing member of Lyginopteris.

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