Piercipollis sp. 1
publication ID |
https://doi.org/ 10.2478/if-2019-0013 |
persistent identifier |
https://treatment.plazi.org/id/0396DC10-BF4E-C242-CC16-B2C7E4C91CBE |
treatment provided by |
Diego |
scientific name |
Piercipollis sp. 1 |
status |
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Text-fig. 42a–c View Text-fig
D e s c r i p t i o n a n d r e m a r k s. Piercipollis sp. 1 is based on an isolated anther containing abundant pollen ( Text-fig. 42a View Text-fig ). The pollen grains are small, about 20 µm in diameter, and monocolpate. The colpus is long, apparently extending to the equator, but none of the grains expose the full length of colpus. The exine is semitectate-reticulate and columellate ( Text-fig. 42b View Text-fig ). The reticulum is coarse, homobrochate and with lumina up to about 0.25 µm in diameter that have polygonal to rounded, irregular outlines ( Text-fig. 42c View Text-fig ). The muri are smooth with slightly rounded profiles and are supported by long scattered columellae. The colpus margin is distinctly delimited by the continuing marginal muri and there is no distinction between the reticulum over the main part of the grains and the reticulum close to the colpus margin. The reticulum detaches easily from the foot layer ( Text-fig. 42b, c View Text-fig ).
The pollen grains of Piercipollis sp. 1 differ from those of Piercipollis simplex in their more dense reticulum, and lumina of more irregular shape. However, incomplete information on the extension of the colpus, and also of details of the colpus margin, preclude formal establishment of a new species.
A f f i n i t y a n d o t h e r o c c u r r e n c e s. Similar grains have not been observed from other mesofossil floras in Portugal.
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