Abstract Pollen morphology, ultrastructure and germination mode of Ibicella lutea was investigated and documented using light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Ibicella pollen is clypeate, spheroidal, apolar, inaperturate, insulated, large, with an average diameter of 80 μm. The pollen wall is formed in the insula by two distinct layers; the outer layer, the exine, which is semitectate, with ectexine constituted by columellae, tectum and foot layer and the granular endexine, being the only layer between the insulae and the inner layer, the thick intine. The generative nucleus is of irregular shape and the vegetative nucleus is spheroidal. This is the first report of the presence of microbodies within the vegetative cell in pollen of Martyniaceae. The probable function of the microbodies in the lipid metabolism of the vegetative cell is discussed. The pollen tube emerges through the thinner areas of the wall between the insulae. In these areas the cytoplasm shows vacuoles and secretory vesicles produced by dictyosomes.

中文翻译：

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Ibicella lutea (Martyniaceae) 的形态、超微结构和花粉萌发

摘要 使用光学显微镜（LM）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究和记录了黄檗花粉的形态、超微结构和萌发模式。Ibicella 花粉呈圆形、球形、无极性、无孔、绝缘、大，平均直径为 80 μm。花粉壁由两个不同的层在岛叶中形成；外层，外壁，半棱柱状，外壁由小柱、顶盖和足层和颗粒状内壁构成，是岛叶和内层之间的唯一层，厚内壁。生殖核呈不规则形状，营养核呈球形。这是关于在Martyniaceae 花粉的营养细胞中存在微体的第一个报告。讨论了微体在营养细胞脂质代谢中的可能功能。花粉管通过岛叶之间壁的较薄区域出现。在这些区域，细胞质显示由双糖体产生的液泡和分泌囊泡。