Clavatipollenites-

Friis, Else Marie, Crane, Peter R., Pedersen, Kaj Raunsgaard, Mendes, Mário Miguel & Kvaček, Jiří, 2022, The Early Cretaceous Mesofossil Flora Of Catefica, Portugal: Angiosperms, Fossil Imprint 78 (2), pp. 341-424 : 357

publication ID

https://doi.org/ 10.37520/fi.2022.016

DOI

https://doi.org/10.5281/zenodo.13919444

persistent identifier

https://treatment.plazi.org/id/03FD87F2-FFED-FFFE-FCC9-FC75C72DF8E2

treatment provided by

Felipe

scientific name

Clavatipollenites-
status

 

Stamens with monocolpate Clavatipollenites- type pollen sp. 2

Text-fig. 11a–e View Text-fig

Description and remarks. The material comprises a single stamen that has in situ Clavatipollenitestype pollen. The anther is tetrasporangiate, elongate and narrow, about 1.3 mm long and 0.3 mm broad ( Text-fig. 11a View Text-fig ). Pollen is monocolpate and almost circular in equatorial outline, about 24–26 µm in diameter. The aperture is short, about 14 µm long, and has an irregular, indistinctly delimited margin.The colpus membrane is covered by irregular verrucae that grade into the reticulum in the non-apertural regions of the grains ( Text-fig. 11b, c View Text-fig ). The exine is semitectatereticulate with a homobrochate reticulum ( Text-fig. 11b, c View Text-fig ). Lumina are irregular and up to about 3 µm in diameter. Muri are narrow, 0.5 µm wide, ornamented with minute verrucae arranged in a single longitudinal row, or sometimes in two rows. The verrucae are sometimes laterally expanded and form poorly defined transverse ridges. Columellae are long, about 1.5 µm, and widely spaced ( Text-fig. 11e View Text-fig ). Orbicules are tiny, spherical with finely verrucate to spiny surface ornamentation ( Text-fig. 11d View Text-fig ).

Affinity and other occurrences. The pollen grains in this specimen are larger than any of the other Clavatipollenites - type pollen observed in the Catefica mesofossil flora. They are also larger than the pollen grains in situ within anthers of Proencistemon ( Tab. 1 View Table 1 ). See also comments on “Stamens with monocolpate Clavatipollenitestype pollen sp. 1” above.

Affinity

Harvard University - Arnold Arboretum

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