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]
Descriptionedit
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).
Referencesedit
^ abcdZeiller, R. (1883). Fruitifications de Fougèred du Terrain Houiller. Ann. Sci. Nat. 6e sèr. Bot. XVI, pp. 177-209
^ abcdKidston, 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
^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.
^ abcdAndrews, N. H. (1970). Index of Generic Names of Fossil Plants, 1820-1965. Geological Survey Bulletin 1-354
^ abJud, N. A. (2011). Unpublished taxonomic opinions.
This article related to a Carboniferousplant is a stub. You can help Wikipedia by expanding it.
crossotheca, extinct, genus, seed, ferns, pteridospermatophyta, widespread, coal, measures, carboniferous, permian, triassic, with, possible, devonian, remains, known, from, belgium, type, species, crepini, named, described, 1883, zeiller, genus, known, from, . 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 CrossothecaTemporal range Carboniferous Triassic 318 1 235 0 Ma PreꞒ Ꞓ O S D C P T J K Pg NSpecimen P 30369 left and the pollen bearing organs of C hughesiana from Dudley EnglandReconstruction of C honinghausiScientific classificationKingdom PlantaeDivision PteridospermatophytaClass LyginopteridopsidaOrder LyginopteridalesGenus CrossophytaZeiller 1883 1 Binomial name Crossophyta crepiniZeiller 1883 1 Other species C boulayi Zeiller 1883 1 C communis Lesquererfx C fimbriata Kidston 1906 2 C grievii Potonie 1954 3 C honinghausi Johnson amp Kidston 1911 4 5 originally Sphenopteris C hughesiana Kidston 1906 2 C kentuekiensis Stubbefield Taylor amp Daghlian 1982 6 C kidstom nomen dubium C kidstoni Crookall C pinnatifida Gutbier C sagittata Lesquererfx C schatzlarensis Stur Kidston 1906 2 C reniformis Brongniart C trichomanoides Sternberg C trisecta SellardsSynonymsSphenopteris honinghausi Brongniart 1849 7 One species C honinghausi is the male fructification of Lyginodendron oldhami 5 9 and the same species is the microsporangia bearing member of Lyginopteris 5 Description editA 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 edit a b c d Zeiller R 1883 Fruitifications de Fougered du Terrain Houiller Ann Sci Nat 6e ser Bot XVI pp 177 209 a b c d 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 Honinghausi Kidston Lyginodendron oldhamium Williamson Royal Dublin Society a b c Palaeobotany Encyclopaedia 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 vegetaux fossiles consideres sous le point de vue de leur classification botanique et de leur distribution geologique 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 nbsp This article related to a Carboniferous plant is a stub You can help Wikipedia by expanding it vte nbsp This article related to a Permian plant is a stub You can help Wikipedia by expanding it vte nbsp This article related to a Triassic plant is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Crossotheca amp oldid 1187397436, wikipedia, wiki, book, books, library,
