Abstract The pollen morphology of 16 species of Aechmea subgenus Ortgiesia is characterised, represented by 59 specimens including original data provided for A. kleinii, A. pimenti-velosoi, A. winkleri, Aechmea sp1 and Aechmea sp2. The pollen grains are monads, subisopolar, amb ellipsoidal, slightly flattened/convex in equatorial view, presenting some spheroidal pollen grains at a small percentage, 2(3)-porate, with small to large pores, pore shape circular or elliptic. The exine on the central area of the pollen grain varied from ‘reticulate’ to ‘predominantly microreticulate’ and less frequently from ‘foveolate’ to ‘microreticulate’. Ortgiesia may be considered stenopalynous by the porate aperture pattern and reticulate sculpturing in most cases. However, some secondary details of the exine ornamentation, such as the size variations of the lumina near the pores, as well as the size and shape of the lumina and muri in the central area of the pollen grain, helped to recognise some groups. Multivariate analyses, based on the pollen grain metric variables, similarly grouped species that are morphologically and taxonomically related by their vegetative and reproductive characteristics, such as A. calyculata and A. kleinii, and A. gamosepala and A. cylindrata, while in the remaining species the palynological similarity was less or null, such as in A. blumenavii and A. kertezsiae; A. blumenavii and A. calyculata; A. caudata and A. coelestis; A organensis and A. coelestis, A. gracilis and A. coelestis. Our results allowed an improved morphological characterisation of Ortgiesia and brought to light important data to complement the palynotaxonomy of the subgenus.

中文翻译：

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Aechmea subgenus Ortgiesia (Regel) Mez（凤梨科，凤梨科）的孢粉分类学

摘要 对Aechmea subgenus Ortgiesia 16 种的花粉形态进行了表征，包括为A. kleinii、A. pimenti-velosoi、A. winkleri、Aechmea sp1 和Aechmea sp2 提供的原始数据59 个标本。花粉粒为单子，近等极，椭圆形，赤道观略扁/凸，呈小比例球状花粉粒，2(3)孔，孔小至大，孔形圆形或椭圆形。花粉粒中央区域的外壁从“网状”到“主要是微网状”不等，从“中心凹”到“微网状”的频率较低。Ortgiesia 在大多数情况下可能被认为是狭窄的孔洞图案和网状雕刻。然而，外壁装饰的一些次要细节，例如孔附近腔的大小变化，以及花粉粒中心区域腔和腔的大小和形状，有助于识别一些群体。多变量分析，基于花粉粒度量变量，类似分组的物种在形态学和分类学上按其营养和繁殖特征相关，例如 A. calyculata 和 A. kleinii，以及 A. gamosepala 和 A. cylindrata，而在其余物种中孢粉学相似性较少或为零的物种，例如在 A. blumenavii 和 A. kertezsiae 中；A. blumenavii 和 A. calyculata; A. caudata 和 A. coelestis; Aorganensis 和 A. coelestis、A. gracilis 和 A. coelestis。