In Situ Gymnosperm Pollen From the Middle Jurassic of Yorkshire

Johanna, H.A. Van Konijnenburg-van Cittert; Gittert, Van Konijnenburg‐Van

doi:10.1111/j.1438-8677.1971.tb00688.x

Acta Botanica Neerlandica

1971

DOI: 10.1111/j.1438-8677.1971.tb00688.x

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In Situ Gymnosperm Pollen From the Middle Jurassic of Yorkshire

H.A. Van Konijnenburg-van Cittert Johanna¹,

Van Konijnenburg‐Van Gittert²

Abstract: SUMMARYIn this paper the morphology of pollen grains yielded by male Gymnosperm fructifications from the Jurassic flora of Yorkshire is studied and discussed.Several new male fructifications were found and described:Hastystrobus gen. The pollen grains were also comparedwith dispersed pollen grains, mainlyfrom the Jurassic.

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Cited by 141 publications

References 47 publications

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Long‐term arid and hot climate during early Mid‐Cretaceous indicate by unvaried Cheirolepidiaceae‐dominant palynoflora from the Liupanshan Basin, China

et al. 2023

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The Mid‐Cretaceous was characterized by long‐term and stabilized high temperatures confirmed by numerous palaeoclimatic information from marine sedimentary archives. However, few terrestrial records have yet been employed to verify the terrestrial humidity under this long‐term hot climate. The Liupanshan Basin, located in central China during the Cretaceous contains thick Aptian‐Albian sediments. Here, we reconstructed a long‐term palaeovegetational record during late Aptian to Albian from the Huoshizhai Section and Sikouzi Section, Liupanshan Basin. Five palynological assemblages were defined from the bottom to top of these strata, and a total of 124 types of palynomorphs including 47 spore species and 77 gymnosperm pollen species were recognized in the palynological assemblages. Sporopollen analysis revealed that the spore‐pollen spectra of Huoshizhai Section were dominated by Perinopollenites and Bisaccate pollen. In Sikouzi section, the Classopollis content dominate in all samples (average 63.8%), with a few other pollen, including conifer bisaccates types, Perinopollenites, Jiaohepollis, Ephedripites, Cycadopites and a few spores. The sporopollen assemblage reflected that the flora of the central Asia continent gradually changed from Taxodiacean‐dominated to Cheirolepidiaceae‐dominated in the late Aptian and the Albian, which further indicates that the central Asia continent palaeoclimate gradually changed from a wet and cold climate to a long‐term dry and hot climate with small fluctuation. In addition, the Classopollis content also presented a slightly increased trend from late Aptian to late Albian, which probably indicated a gradually intensified hot and dry climate. The thermophilic floral changes and warmer/cooler ratio of the Sporomorph Ecogroup Model at the middle Madonghshan Formation also shows slightly decreased trends which correspond to the global short‐term cooling events at the Aptian‐Albian transition.

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Long‐term arid and hot climate during early Mid‐Cretaceous indicate by unvaried Cheirolepidiaceae‐dominant palynoflora from the Liupanshan Basin, China

et al. 2023

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Pollen morphology and ultrastructure of theBennettitales: In situ pollen ofCycadeoidea

Osborn

Taylor

1995

American J of Botany

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The micromorphology and ultrastructure of in situ pollen from Cycadeoidea dacotensis are described from permineralized specimens collected from the Lower Cretaceous of North America. Pollen grains are ovoid and relatively small, averaging 25 μm in length and 12 μm in width. Grains are monosulcate with the exine typically invaginated in apertural regions. Exine ornamentation ranges from punctate to psilate. The exine averages 0.73 μm in thickness and is composed of a light‐staining sexine and a dark‐staining nexine. The sexine consists of a thin, homogeneous tectum, typically with a well‐defined inner boundary, and a thicker granular infratectum. The infratectal granules are relatively uniform in size, however, variation occurs in the arrangement of granules. In some grains, the sexine appears homogeneous because there is little lacunal space between the individual granules. The granular infratectum is in direct contact with the underlying nexine. The nexine is uniform in thickness in both apertural and nonapertural regions, and it lacks lamellae throughout. Pollen morphology and ultrastructure are compared with those of the bennettitalean genus Leguminanthus and the dispersed genus Monosulcites. In addition, the fine structure of Cycadeoidea pollen is compared to that of the gymnosperm groups with which the Bennettitales are regarded to be most closely related, including Gnetales, Pentoxylales, and Eucommiidites‐type pollen‐producing plants.

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Araucarian conifer from late Albian amber of northern Spain

Kvaček

Barrón

Heřmanová

et al. 2018

Papers in Palaeontology

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National Museum Prague, V aclavsk e n am. 68, 115 79, Abstract: Araucarian pollen cones Rabagostrobus hispanicus gen. et sp. nov. and their associated foliage Brachyphyllum obesum Heer are described from Lower Cretaceous (Albian) strata of northern Spain. Male cones consist of helically arranged microsporophylls bearing 5-8 elongate pollen sacs with in situ inaperturate Araucariacites-type pollen. The new taxon is compared to material described previously from the Early Cretaceous of North and South Americas. Sterile twigs of B. obesum bear helically arranged leaves with wrinkled margins. Its cuticle has files of predominantly transversely oriented stomata. Both twigs and pollen cones occur as inclusions in amber from the Peñacerrada 1 outcrop ( Alava Province), and as compressions are recorded from the amber-bearing strata sediments of the R abago/El Soplao outcrop. Inclusions of araucariacean plant remains and the co-occurrence of amber and male cone and twig compressions suggest that the amber in these two localities, or at least some of it, was produced by araucariacean plants.

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In Situ Gymnosperm Pollen From the Middle Jurassic of Yorkshire

Cited by 141 publications

References 47 publications

Long‐term arid and hot climate during early Mid‐Cretaceous indicate by unvaried Cheirolepidiaceae‐dominant palynoflora from the Liupanshan Basin, China

Long‐term arid and hot climate during early Mid‐Cretaceous indicate by unvaried Cheirolepidiaceae‐dominant palynoflora from the Liupanshan Basin, China

Pollen morphology and ultrastructure of theBennettitales: In situ pollen ofCycadeoidea

Araucarian conifer from late Albian amber of northern Spain

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