A pollen inventory of endemic species from the Azores archipelago, Portugal

Pollen morphology of the endemic genera of the Madeira archipelago, Portugal

“…Pollen grain morphology of ten endemic species of the Madeira archipelago is described below. Pollen grain description follows the sequence adopted in Morgado et al (2017), namely pollen grain size, polarity, shape, aperture (number), and ornamentation. Standard morphological characteristics of pollen grains are presented for all study species (Tables 2–4).…”

“…However, they can be easily separated from those of the two other Macaronesian endemic bellflowers, Azorina vidalii (H.C. Watson) Feer and Canarina canariensis (L.) Vatke (Menezes et al 2018). The pollen grains of the Azorean A. vidalii are tetraporate with anulus present and spiculate ornamentation while the Canarian C. canariensis are tricolporate with microreticulate/microgemmate ornamentation (Halbritter 2016; Morgado et al 2017).…”

“…The pollen grains of the two Madeira endemic genera differ from those of the Azorean endemic Daucus carota subsp. azorica Franco (a representative of clade I) which are perprolate, have striate ornamentation and their size range between 37.5-45.0 mm (Morgado et al 2017).…”

“…We randomly selected 25 undamaged pollen grains from each study species to measure polar and equatorial diameters in equatorial view and calculate P/E ratios. Additionally, we measured the apocolpium/apoporium (LA) and the equatorial diameter in polar view (DEPV), the size of the exine layers, and aperture width and length from a random sample of pollen grains (Morgado et al 2017). Unfortunately, we were not able to obtain data on LA and DEPV for M. decipiens .…”

“…On the other hand, a considerable number of palynological studies were carried out in the Canaries (e.g. La Serna-Ramos et al 1994; La Serna-Ramos 1996; La Serna-Ramos & Padron-Mederos 2008; Padrón-Mederos and La Serna-Ramos 2011) and, more recently, several investigations on pollen morphology were conducted in Azores (Morgado et al 2014, 2015), where a pollen inventory of the endemic species was also performed (Morgado et al 2017). In this study we aim to characterize and compare the pollen morphological features of ten species from the endemic plant genera of Madeira archipelago and contribute to a better understanding of their taxonomy.…”