orientalis: The pollen grains are tectate or semitectate, radially symmetric, isopolar, tricolpate, prolate-spheroidal,outline is elliptic in the equatorial view and circular in the polar view "Figure 1A and B, Figure 2A and B".
sulphurea: The pollen grains are tectate or semitectate, radially symmetric, isopolar, tricolpate, prolate-spheroidal, outline is elliptic in the equatorial view and circular in the polar view "Figure1C and D, Figure2C".
Timing in the evolution of derived floral characters: Upper Cretaceous (Turonian) taxa with tricolpate
Besides the characteristic exine structure, additional pollen characters reinforce the distinction of the Nassauvieae from the Mutisieae and Stifftieae: (1) the pollen of Nassauvieae and Stifftieae is always tricolporate, whereas in Mutisieae it can be tricolporate (most genera) or tricolpate (Hecastocleis and some species of Ainsliaea); (2) polar caps are more frequent in pollen of Nassauvieae (e.
The pollen of Macroclinidium has a particular exine type, and some species of Ainsliaea have tricolpate pollen, which is unusual in Asteraceae with the Mutisia or the Ainsliaea exine type (Telleria et al.
Pollen spheroidal to prolate, medium to large size, tricolpate
The unusual occurrence of tricolpate
pollen within Mutisieae (Asteraceae).
A survey of tricolpate
(eudicot) phylogenetic relationships.
The implications of tricolpate
pollen in Gunnera have never been
The primitively microreticulate, tricolpate
pollen of basal Saxifragaceae developed the bulging mesocolpia distinctive of Gunnera (cr.
from Scabiosaepollenites in being tricolpate
, whereas the latter is
Pollen usually tricolpate
to tricolporate, in tetrahedral tetrads, but these sometimes reduced, or occasionally in monads, sometimes associ ated with viscin threads.