Table VI.
Tabulation of differentiating pollen features in the Psittacanthinae: Cladocolea-Struthanthus lineage (including Peristethium; pollen Type B, pollen without margo).
| Genus | Apertures | Polarity, size, shape | Outline in e.v. and p.v. | Equatorial apices | Special exine features (LM) | Pole | Sculpturing |
|---|---|---|---|---|---|---|---|
| Cladocolea andrieuxii, C. loniceroides, C. microphylla | Demiparasyn(3)colpate, colpi wide or widening towards equatorial apices | Isopolar, medium, oblate where observed | Elliptic, straight- to broadly convex-triangular | Rounded | Nexine thinning perpendicular to colpi, triangular polar thickening | Protruding apocolpial field | ? |
| C. glauca, C. pringlei | Parasyn(3)colpate, colpi narrow or wide | Isopolar, medium, oblate where observed | Elliptic, straight- or convex-triangular | Obcordate | Nexine thinning perpendicular to colpi, triangular polar thickening | Protruding apocolpial field | ? |
| C. micrantha (formerly Phthirusa) | (Demi?)syn(3)colpate, colpi taperings towards pole and equator | Isopolar, small to medium, shape not reported | Straight-triangular (e.v. not available) | Rounded | ? | Indifferent | ? |
| Struthanthus dichotrianthus, S. quercicola, S. deppeanus, S. marginatus | Parasyn(3)colpatea, colpi wide or widening towards equatorial apices | Iso- or heteropolar, medium, oblate where observed | Elliptic, straight- to convex-triangular | Obcordate or rounded | Nexine thinning perpendicular to colpi, triangular polar thickening | Protruding apocolpial field | ? |
| S. hartwegii | Demisyn(3)colpate, colpi wide | Isopolar, small to medium, shape not reported | Straight-triangular (e.v. not available) | Rounded | Nexine thinnings perpendicular to colpi, triangular polar thickening | Indifferent | ? |
| S. concinnus | Syn(3)colpate, colpi narrow | Isopolar, medium, shape not reported | Straight-triangular (e.v. not available) | Obcordate | None | Triradiate triangular polar thickenings | Rugulate |
| S. marginatusb | Syn(3)colpate, colpi widening towards polar area | Isopolar, medium, distinctly oblate | Slightly emarginate, straight-triangular | Obcordate | Equatorial mesocolpium (sexine) and polar area (nexine) thickened | Triradiate triangular polar thickenings | Rugulate |
| S. uraguensis | Syn(3)colpate, colpi wide | Isopolar, oblate | Subrhombic, slightly convex-triangular | Obcordate | Equatorial mesocolpium (sexine) thickened | Indifferent | Rugulate, rugulae forming mesocolpial clusters |
| Peristethium leptostachyum (formerly Struthanthus) | (Demi)syn(3)colpate, colpi narrow | Isopolar, small, oblate | Elliptic, straight- to slightly convex-triangular | Broadly rounded | Triangular polar nexine thickening | Minute protruding island | Rugulate, partly striate |
Note: Abbreviations: e.v., equatorial view; p.v., polar view; a Face parasyncolpate with small apocolpial field; counterface essentially syncolpate, colpi interrupted at pole by triangular extrusions; b Specimen referred to as S. vulgaris.