On Some Disaccate Pollen Grains of Permian to Middle Jurassic Age

Townrow, John A.

doi:10.1080/00173136209429098

Cited by 35 publications

(15 citation statements)

References 14 publications

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“…is unclear. It has been assigned to conifers (Clement-Westerhof, 1974) and to pteridosperms (Townrow, 1962). The monosulcate pollen Cycadopites spp.…”

Section: Skmentioning

confidence: 99%

Vegetation history across the Permian–Triassic boundary in Pakistan (Amb section, Salt Range)

et al. 2015

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“…is unclear. It has been assigned to conifers (Clement-Westerhof, 1974) and to pteridosperms (Townrow, 1962). The monosulcate pollen Cycadopites spp.…”

Section: Skmentioning

confidence: 99%

Vegetation history across the Permian–Triassic boundary in Pakistan (Amb section, Salt Range)

et al. 2015

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“…-Florinites have been probably generated by cordaitales (Schopf et al, 1944) -Alisporites have been produced by conifers such as Pteruchus, Lelestrobus, and Willsiostrobus (Townrow, 1962;Grauvogel-Stamm, 1978;Srivastava, 1984).…”

Section: Discussionmentioning

confidence: 99%

“…The same as Esignisporites and Vitrisporites, Falcisporites have been generated by Triassic seed ferns such as Harristothechan (Townrow, 1962).…”

Section: Resemblancementioning

confidence: 99%

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Paleoecology of Permo-Triassic Boundary According to Palynoflora in Shourjestan, Iran

Rad¹,

Noroozpour

2017

International Journal of Geography and Geology

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“…Dispersed pollen grains of Alisporitestype were found in association with macro remains of the Corystospermaceae. Pollen grains extracted from corysto sper maceous pollen organ Pteruchus were described by Townrow (1962Townrow ( , 1965, Osborn & Taylor (1993), Xuanli et al (1995), and Axsmith et al (2000). The exine ultrastructure of Pteruchus pollen was studied by several authors (Taylor et al 1984: P. dubius; Zavada & Crepet 1985: P. africanus, P. dubius, and P. papillatus; Osborn & Taylor 1993: Pteruchus sp.).…”

Section: Preflosella Nathaniamentioning

confidence: 99%

Bisaccate Pollen of Probable Gnetalean Species and Pollen Diversity in Gnetophytes

Tekleva¹

2015

Bot Pac

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The exine ultrastructure of Dinophyton spinosum (Upper Triassic, USA), Preflosella nathania, and Alisporites alimentosus (Lower Cretaceous, Russia) has been studied. Pollen grains were extracted from reproductive organs of Dinophyton spinosum and Preflosella nathania; pollen grains of Alisporites alimentosus are from the guts of a fossil insect. Dinophyton and Preflosella are attributed to gnetophytes, Alisporites alimentosus pollen grains were supposed to be produced by Preflosella plant.The infratectum is alveolate in the three species; however, the alveola pattern and thickness of the layers are condiserably different. Therefore, Alisporites alimentosus and Preflosella nathania are not closely related. Bisaccate alveolate pollen grains are distinct from other known pollen types of gnetophytes (non-saccate, granular or columella-like). Gnetophytes share certain pollen types with other plant groups; their comparison and possible transitions between gnetalean pollen types are discussed. . Пыльцевые зерна Dinophyton spinosum и Preflosella nathania были извлечены из соответствующих репродуктивных ор-ганов; пыльцевые зерна Alisporites alimentosus извлечены из отпечатка желудка ископаемого насекомого. Dinophyton и Preflosella относят к гнетофитам. Пред-полагалось, что пыльцевые зерна Alisporites alimentosus продуцировались Preflosella. Эти три вида характеризуются ячеистым инфратектумом, однако характер ячеистости и толщина слоев значительно различаются у этих ви-дов. Таким образом, показано, что пыльцевые зерна Alisporites alimentosus не могли продуцироваться Preflosella nathania. Двумешковые ячеистые пыльце-вые зерна Dinophyton и Preflosella отличаются от остальных известных пыль-цевых типов гнетофитов (безмешковые, с гранулярным или столбиковид-ным инфратектумом). Пыльцевые типы гнетофитов встречаются также в других группах растений; рассмотрены сравнение и возможные переходы между пыльцевыми типами гнетофитов. К л ю ч е в ы е с л о в а : Dinophyton, Preflosella, Alisporites, гнетофиты, ультраструктура экзины

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On Some Disaccate Pollen Grains of Permian to Middle Jurassic Age

Abstract: The pollen of those organs producing disaccate grains of Permian to Aliddle Jurassic (Bajoeian) age is reconsidered. The features used to distinguish disaccate pollen grains is discussed.

Cited by 35 publications

References 14 publications

Vegetation history across the Permian–Triassic boundary in Pakistan (Amb section, Salt Range)

Vegetation history across the Permian–Triassic boundary in Pakistan (Amb section, Salt Range)

Paleoecology of Permo-Triassic Boundary According to Palynoflora in Shourjestan, Iran

Bisaccate Pollen of Probable Gnetalean Species and Pollen Diversity in Gnetophytes

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