Pollen morphology of the genus Paralychnophora (Vernonieae–Asteraceae)

Abstract

Paralychnophora is an exclusively Brazilian genus that has few species and a confusing taxonomy. The current study aims to help us better understand this genus by analysing pollen grains from six Paralychnophora species. The pollen grains were acetolysed, analysed and photomicrographed under light microscopy. They were not acetolysed for the scanning electron microscopy analysis. Features such as shape, size, exine constitution and aperture were investigated. The species were separated in a pollen key, and their features were of great diagnostic value for the genus. The ornamentation pattern allowed separating P. patriciana from P. reflexoauriculata, and it grouped the other taxa. P. atkinsiae distinguished itself by the polar area index (PAI) size. P. bicolor, P. harley and P. glaziouana were easily separated from each other when other features such as size, shape, distance between the spines and aperture dimensions were analysed together.

Pollen Evolution in the Genus Echinops (Cardueae, Asteraceae): Deciphering the Origin of Giant Pollen Grains

“…Subtribe assignment follows the circumscriptions of Herrando-Moraira et al (2019, 2020. For comparative purposes, we also compiled data for another tribe, the Vernonieae, that includes representatives with a syncephalium of globular shape and a small number of flowers per capitulum resembling that of Echinops (e.g., Chresta; Siniscalchi et al 2017) as well as other types of syncephalium (e.g., Eremanthus Less [Loeuille et al 2012]; Paralychnophora MacLeish [Souza-Souza et al 2016]). P and E length data were gathered from the literature for 303 taxa of Vernonieae (table A2), together with information on whether these taxa were syncephalous.…”

Palynotaxonomy of species of Dendrophorbium (Asteraceae: Senecioneae) occurring in Brazil

“…and, less commonly, of other recent and fossil palynomorphs. In Brazil, important contributions to the palynology of Asteraceae were made by Salgado-Labouriau (1973); Melhem et al (2003); Mendonc¸a and Gonc ¸alves-Esteves (2000); Mendonc ¸a et al (2002Mendonc ¸a et al ( , 2007aMendonc ¸a et al ( , 2007bMendonc ¸a et al ( , 2009Mendonc ¸a et al ( , 2010; Cancelli et al (2005Cancelli et al ( , 2010; Magenta et al 2010;; Souza-Souza et al (2016); Siniscalchi et al (2017); Moreira et al (2018); Soares et al (2020) and Souza-Souza et al (2021. This study aimed to morphologically characterize the pollen grains of the 13 species of Dendrophorbium that occur in Brazil, of which 11 were described palynologically, for the first time.…”