Crossotheca

Crossotheca Temporal range: Carboniferous-Triassic, 318.1–235.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N

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)^[1]
Species
†C. boulayi Zeiller (1883)^[1] †C. communis Lesquererfx †C. crepini Zeiller (1883) †C. fimbriata Kidston (1906)^[2] †C. grievii Potonie (1954)^[3] †C. höninghausi Johnson & Kidston (1911)^[4]^[5] [originally Sphenopteris] †C. hughesiana Kidston (1906)^[2] †C. kentuekiensis Stubbefield, Taylor & Daghlian (1982)^[6] †C. kidstom? (nomen dubium) †C. kidstoni Crookall †C. pinnatifida Gutbier †C. sagittata Lesquererfx †C. schatzlarensis †C. reniformis †C. trichomanoides †C. trisecta Sellards
Synonyms
Sphenopteris höninghausi Brongniart (1849)^[7]

Crossotheca is an extinct genus of seed ferns (Pteridospermatophyta) widespread in coal measures of Carboniferous, Permian and Triassic age,^[8] with possible Devonian remains known from Belgium.^[8]^[9] The type species is C. crepini, named and described in 1883 by R. Zeiller,^[1] and the genus is known from fossils found in Belgium (?), Canada, China, England, France, Hungary, Ireland, Poland and the United States.^[8]

One species, C. höninghausi, is the male fructification of Lyginodendron oldhami^[5]^[9] and the same species is the microsporangia-bearing member of Lyginopteris.^[5]

YouTube Encyclopedic

1/3
Views:
462
6 642
1 353

Transcription

Description

A fertile Crossotheca branch shows the following features:^[2]^[8]

The branch tips are slightly expanded into a circular or paddle-shaped limb.
At the tip of each branch there are a few bilocular sporangia attached together.
Each sporangium contains a number of microspores (pollens).

References

^ ^a ^b ^c Zeiller, R. (1883). Fruitifications de Fougèred du Terrain Houiller. Ann. Sci. Nat. 6e sèr. Bot. XVI, pp. 177-209
^ ^a ^b ^c Kidston, Robert (1906). "On the microsporangia of the pteridosperms". The Royal Society Publishing. 77 (515): 161–162. Bibcode:1906RSPSB..77..161K. doi:10.1098/rspb.1906.0005.
^ Potonie, R. (1954). Position of the Paleozoic spore genera in the natural system.
^ F. L. S., Johnson, T. D. (1911). A seed-bearing Irish Pteridosperm, Crossotheca Höninghausi, Kidston (Lyginodendron oldhamium, Williamson). Royal Dublin Society
^ ^a ^b ^c "Palaeobotany," Encyclopædia Britannica (11th ed.), v. 21, 1911, p. 536, fig. 28.
^ Stubblefield, S.P., Taylor, T.N. and Daghlian, C.P., (1982). Compressed plants from the Lower Pennsylvanian of Kentucky (U.S.A.). I. Crossotheca kentuekiensis n. sp. Rev. Palaeobot. Palynol., 36: 197--204.
^ Brongniart, A.T. (1849). Tableau des genres de végétaux fossiles considérés sous le point de vue de leur classification botanique et de leur distribution géologique. Dictionnaire Universel d'Histoire Naturelle. 13. 1-127.
^ ^a ^b ^c ^d Andrews, N. H. (1970). Index of Generic Names of Fossil Plants, 1820-1965. Geological Survey Bulletin 1-354
^ ^a ^b Jud, N. A. (2011). Unpublished taxonomic opinions.

This article related to a Carboniferous plant is a stub. You can help Wikipedia by expanding it.

This article related to a Permian plant is a stub. You can help Wikipedia by expanding it.

This article related to a Triassic plant is a stub. You can help Wikipedia by expanding it.

This page was last edited on 15 April 2024, at 09:54

From Wikipedia, the free encyclopedia

YouTube Encyclopedic

Transcription

Description

References