@Article{taiwania2009542101,
AUTHOR = {Annie Skarby, Marta A. Morbelli, John R. Rowley},
TITLE = {Structure of the Pollen Exine of Rhoiptelea chiliantha},
JOURNAL = {Taiwania},
VOLUME = {54},
YEAR = {2009},
ISSUE = {2},
PAGES = {101-112},
URL = {https://taiwania.ntu.edu.tw/abstract/900},
ABSTRACT = {The exine of mature pollen grains of Rhoiptelea chiliantha was studied. The size of the pollen grains is about 23 by 27 μm. They are tricolporate with short colpi that are 1-2 μm wide and 10-12 long. The spinules of Rhoiptelea are similar in form and size to those of Gentianales. The spinules consist of rods of ca 70 nm in width. These rods are evident throughout the tectum and columellae. The columellae are of two distinct sizes. The smaller ones are ca 70 nm wide and join the tectum and the larger columellae. These larger ones appear to be composed of several 70 nm in width rods. They join the distal surface of the foot layer. The proximal surface of the foot layer is marked by a white line (referred to as a junction plane) where it joins the endexine. The endexine consists of a solid-appearing component adjacent to the foot layer (referred to as endexine-1) and laminar components (endexine-2) that are attached to and apparently become a part of endexine-1. There is no indication of an arcus. In well preserved grains the aperture is covered by an operculum or operculum-like component. In well-rehydrated pollen grains there is an oncus of considerable complexity under the aperture and over the intine. The Ubisch bodies have an exine ornamented with widely-spaced spinules like the spinules on the pollen exine.},
DOI = {10.6165/tai.2009.54(2).101}
}