Palinotaxonomia de Albertinia brasiliensis Spreng., Eremanthus bicolor (DC.) Baker e Vanillosmopsis erythropappa (DC.) Sch. Bip. (Compositae-Vernonieae)

Abstract

Palinotaxonomia dePollen grains of specimens collected in different herbaria were used in this study. The two first species are found in Rio de Janeiro, but Eremanthus is not found in this state. For this reason, the type species of this genus was used for pollen analysis. Pollen grains were acetolysed, measured, described and illustrated using optical microscopy. Non-acetolysed pollen grains were used for analysis in scanning electron microscopy. The results showed that these species can be distinguished using mainly exine ornamentation and aperture features, revealing an interspecific evolutionary gradation of pollen characteristics. As regards the taxonomy of the species studied, the palynological data confirm the taxonomic position of Albertinia brasiliensis, but they do not support the subordination of Vanillosmopsis to Eremanthus.

Pollen morphology of the genus Paralychnophora (Vernonieae–Asteraceae)

“…between typical lophate and subechinolophate. As for the results obtained herein, only the ornamental pattern (subechinolophate type) was different from those found by Peçanha et al (2008). The other results were similar to theirs.…”

“…Instead of only using the dimensions of the spines, it was possible for us to separate the Paralychnophora taxa according to exine shape and ornamentation, the dimensions of the apertures and spines; thus, these were results different from those found by Hind (2000). Peçanha et al (2008) analysed Paralychnophora bicolor pollen grains (D Eremanthus bicolor [DC.] Baker) and described them as medium to large, isopolar, oblate spheroidal, with small polar area, tricolporate, sublophate pattern exine, i.e.…”

Towards a phylogenetic classification of Lychnophorinae (Asteraceae: Vernonieae)

“…Pollen data were extracted from the following publications: Angulo and Dematteis (2010), Carrijo et al (2005), Coile and Jones (1981,1983), Dematteis (2007Dematteis ( , 2009 Peçanha et al (2001Peçanha et al ( , 2008, Pruski (1992), Robinson ( , 1983Robinson ( , 1987aRobinson ( , b, c, 1988Robinson ( , 1990Robinson ( , 1992aRobinson ( ,b, 1993Robinson ( , 1994Robinson ( , 1999a, Robinson and Funk (1987), Robinson and Marticorena (1986), Robinson et al (2008), Skvarla et al (2005), Smith and Coile (2007) and Stix (1960).…”

“…The pollen grains of Lychnophorinae are tricolporate, echinate, sublophate with a perforated tectum continuous between colpi (type "A") Keeley and Robinson, 2009). The endoaperture is usually lalongate (Peçanha et al, 2008). The type "A" pollen is considered a reversion from more strongly lophate ancestors in the Vernonieae, but it is nevertheless one of the most common forms in the tribe, and is consistent in many groups such as the Piptocarphinae, Vernonia s.s. and Vernonanthura (Robinson, 1990.…”

“…The type "A" pollen is considered a reversion from more strongly lophate ancestors in the Vernonieae, but it is nevertheless one of the most common forms in the tribe, and is consistent in many groups such as the Piptocarphinae, Vernonia s.s. and Vernonanthura (Robinson, 1990. Studies of Lychnophorinae pollen are limited to some species of Albertinia and Paralychnophora (Peçanha et al, 2008) and Eremanthus (Loeuille et al, in prep.). These results indicate that palynological data are not significant in the delimitation at specific level and probably at generic level in the subtribe Lychnophorinae.…”