Wall ultrastructure of the Permian pollen grain Lueckisporites virkkiae Potonié et Klaus 1954 emend. Clarke : Evidence for botanical affinity

Abstract

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The age of North America’s youngest Paleozoic continental vertebrates: a review of data from the Middle Permian Pease River (Texas) and El Reno (Oklahoma) Groups

“…L. virkkiae was, in fact, the most abundant taxon in Wilson's collection, comprising 68.10% of the assemblage. This formerly enigmatic, bisaccate pollen grain recently has been assigned recently to voltzian conifers (Gibson et al, 2020). Thus, the dominant plant type of both the San Angelo compression assemblage of North-Central Texas and the nearly coeval Flowerpot Shale palynoflora of southwestern Oklahoma is unambiguously Middle to Late Permian.…”

Extinct seed plant diversity in the Early Cretaceous: An enigmatic new microsporangiate fossil with Decussosporites pollen in situ

“…As far as we are aware the decussate arrangement of apertures seen in Decussosporites has not been observed in the pollen of any living seed plants. However, a somewhat similar configuration of pollen apertures occurs a variety of dispersed striate-protosaccate pollen grains that occur in Permian and Triassic palynofloras from many parts of the world (e.g., Scheuring, 1974;Tiwari, 1981Tiwari, , 1982Meyen, 1984;Gormankov and Meyen, 1986;Vázquez and Césari, 2017;Gibson et al, 2020). Among these Lueckisporites virkkiae R.Potonié & Klaus emend.…”

“…Among these Lueckisporites virkkiae R.Potonié & Klaus emend. R.F.A.Clarke is especially widespread (Gibson et al, 2020). Some of these pollen grains from the Permian and Triassic are also known in situ, including in the Triassic pollen cone Aethophyllum stipulare (Brongn.)…”

“…Grauvogel-Stamm (Grauvogel-Stamm, 1978) and in the Triassic male structure of Pramelreuthia haberfelneri (Krasser) Kräusel (Klaus, 1966). Aethophyllum stipulare is considered a pollen cone of a voltzialean conifer (Grauvogel-Stamm, 1978) and a voltzialean relationship is also envisaged for Lueckisporites virkkiae (Gibson et al, 2020). The relationships of Pramelreuthia are uncertain and it is not certain that Pramelreuthia haberfelneri from the Triassic of Europe is closely related to the two species of Pramelreuthia described from the Triassic of the southwestern United States (Ash and Litwin, 1996).…”

New Record of the Lueckisporites/Weylandites Biozone (Permian) in the Paganzo Basin, Argentina: Stratigraphic Significance

“…Klaus, 1963 (Figs. 5.7-5.9, 7.9-7.12) Vázquez and Césari (2017), are considered a variant of L. virkkiae (variant A of Clarke 1965, Gibson et al, 2020. The specimen illustrated as L.…”