Table VII.
Tabulation of differentiating pollen features in the Psittacanthinae: the remaining genera.
| Genus | PT | Apertures | Size, shape, outline in e.v. and p.v. | Equatorial apices | Margo | Further exine features (LM, SEM, TEM) | Sculpturing (SEM) |
|---|---|---|---|---|---|---|---|
| Phthirusa hutchisonii | A | Zono(4)colpatea | Small to medium, ± spheroidal | N/A | None | None | Echinate |
| P. clandestina | B | Syn(3)colpate | Small, oblate, broadly elliptic, straight-triangular | Broadly rounded to obcordate | Distinct, micro-rugulate to psilate, perforate | LM: sexine thickened in mesocolpium, nexine hexagonally thickened in polar area | Micro-rugulate |
| P. inconspicua | B | (Demi?)syn(3)colpate | Small, distinctly oblate, equatorial outline unknown, straight-triangular | Truncated | ? | ? | ? |
| Maracanthus | B | Syn(3)colpate | Medium, oblate, elliptic, straight-triangular | Obcordate | ? | LM: Nexine thickened in polar area | ? |
| Oryctinab | B | (Demi)syn(3)-colpate | Small, shape and equatorial outline unknown, straight- or convex-triangular | Broadly rounded or obcordate (O. scabrida) | ? | LM: Triradial nexine thickening in polar area | ? |
| Panamanthus | C? | Possibly demi(3)colpate | Medium, shape and equatorial outline unknown, concave-triangular to broadly trilobate | Broadly Rounded | ? | LM: Polar nexine thickened | ? |
| ‘Type 2’: Passovia coarctata, P. ovata, P. lepidobotrys, P. pedunculata | B | Demi(syn)(3)-colpate | Mostly medium, oblate, broadly elliptic (can be subrhombic) | Broadly rounded | Distinct, psilate | LM: nexine (triangular) thickend SEM: Raised polar area (P. lepidobotrys) TEM: polar ect- and entexine thickened (P. ovata) |
(Micro)rugulate, fossulate, perforate |
| ‘Type 1’: Passovia pyrifolia s.str., P. platyclada | C | Demi(3)colpate | Small to medium, oblate, ± subrhombic, broadly trilobate | Broadly rounded | Distinct, psilate | LM: Triradial nexine thickening in polar area | (Micro)rugulate, fossulate, perforate |
| Dendropemon | C | Demi(3)colpate | Medium, oblate, subrhombic?, broadly trilobate | Broadly rounded | ? | LM: Triradial nexine thickening in polar area | ? |
| Oryctanthus | D | Demi(3)colpate, colpi indistinct | Medium, oblate, elliptic, (sub)circular | N/A | None | Highly ornamented (see Figure 25) | Lophate |
Note: Abbreviations: e.v., equatorial view; p.v., polar view; N/A, not applicable; LM, light microscopy; SEM, scanning electron microscopy; TEM, transmission electronic microscopy; a Feuer and Kuijt (1985) reported also 3- or 5-colpate grains; b Oryctanthus scabridus (=Oryctina scabrida) included here following Caires (2012) and evidence from pollen.