cf. Endressistemon sp. 3

Text-fig. 29e–g

Description and remarks. The material comprises a single stamen from which the stamen base is missing. The anthers are basifixed, tetrasporangiate and dithecate (Text-fig. 29e). The stamens are up to about 0.7 mm long, including the apical projection, and about 0.3 mm broad over the anther. Apically the stamen has a prominent, coriaceous projection that is peltate to wing-like (Text-fig. 29e). Dehiscence is longitudinal and the anther wall is rolled back indicating valvate dehiscence (Text-fig. 29e).

Pollen grains in situ are monocolpate, semitectatereticulate, circular in equatorial view, 13 µm in diameter, with a homobrochate reticulum (Text-fig. 29f, g). The grains are folded and the extent of the aperture is not fully exposed.

Affinity and other occurrences. The stamen is similar to stamens of some extant Annonaceae (see comments on Endressistemon above), but also to the individual stamens of Endressistemon cateficensis and it is possible that it was originally part of a similar staminate structure. The pollen grains in situ are also similar to those of Endressistemon cateficensis, but are larger and the two taxa are probably not conspecific.