Linum, Linnaeus, 1753

Ramírez-Arriaga, Elia, Prámparo, Mercedes B. & Martínez-Hernández, Enrique, 2014, Angiosperm pollen grains from the Cuayuca Formation (Late Eocene to Early Oligocene), Puebla, Mexico, Palaeontologia Electronica 102 (8), pp. 1-38 : 19-20

Linum pollen type

Figure 4.15

Material. Sample Pb-9334, Palynology Laboratory, IGLUNAM.

Description. Monad pollen, isopolar, radiosymmetric, amb subcircular. Tricolpate, the broad and large colpi make a small polar area. Exine semitectate columellate, 3 µm thick, microreticulate to striate, supragemmate, gemmae 2–3.5 µm in diameter, distributed irregularly over the surface of the grain.

Dimensions. Equatorial diameter 48–53 µm, one specimen measured.

Comparisons. Tricolpate pollen grain characterized by large size ( Wingate, 1983: 44 x 49 µm) and gemmate ornamentation has been reported from the Elko Formation ( Wingate, 1983, plate 2, figure 12). The tricolpate pollen type 1 from the Elko Formation is not semitectate microreticulate like the Linum pollen type from the Cuayuca Formation, and has a thinner exine.

Other occurrences. This is the first mention of the genus in the Mexican fossil record. This taxon is also recorded from the European middle Eocene to early Oligocene, Ebro Basin, Spain ( Cavagnetto and Anadón, 1996).

Figures

FIGURE 4. Angiosperm pollen grains from the Cuayuca Formation. 1, Corsinipollenites sp. 1, Pb–9334(1): EF G33/ 3; 2, Corsinipollenites sp. 3, Pb–9334(4): EF R36/1; 3, Corsinipollenites sp. 2, Pb–9334(4): EF T35/3; 4-5, Margocolporites sp., Pb–9340(1): EF N35/3; 6, Margocolporites aff. vanwijhei, Pb-9334(1'): EF T39/2; 7, Monocolpopollenites aff. texensis Nichols, Ames and Traverse 1973 Pb–8872(1A): EF W29/1; 8-9 Rhoipites sp., Pb–8890(1):101.9/17.2; 10, Lymingtonia sp., Pb–9334(4): EF S32/4; 11, Momipites tenuipolus Pb-9334(4): 101.6/12.5; 12, Momipites coryloides, Pb-9138’(1): 92.2/2.8; 13, Fabaceae pollen type 3, Pb–9334(4): EF M34/4; 14, Clavainaperturites sp., Pb– 9147(2): EF R34/2; 15, Linum pollen type, Pb–9334 (1’): EF S33/2; 16, Magnaperiporites sp., Pb–9334(4): EF R39/2; 9. Scale bar represnts 10 µm.