This paper presents pollen morphology of 12 native Brazilian species of Rutaceae from forest fragments of São Paulo, Brazil. The aim of this research is to expand the morphological knowledge of the species, thus contributing to taxonomic knowledge and, subsequently, conservation of species and the forest area. The pollen grains were acetolyzed, measured, described qualitatively, and illustrated using light microscopy (LM) and scanning electron microscopy (SEM). The studied species have differences in polarity, size, shape, aperture and exine ornamentation of the pollen grains, confirming the eurypalynous character of Rutaceae pollen. In particular, species of Zanthoxylum L. also presented significant differences in the pollen grains, confirming the morphological variation within the genus. The quantitative data and multivariate analysis confirm the morphological description; thus, the results reinforce the importance of pollen morphology in the identification and characterization of species of Rutaceae.
-(Pollen flora of "Reserva do Parque Estadual das Fontes do Ipiranga" (São Paulo, Brazil). Family: 136-Solanaceae). Pollen grains of 12 genera and 41 species of Solanaceae occurring in the "Reserva do Parque Estadual das Fontes do Ipiranga" were examined: Acnistus arborescens (L.) Schlecht., Athenaea picta (Mart.) Sendtn., Brunfelsia latifolia Benth., Brunfelsia pauciflora
IntroduçãoEste trabalho faz parte do projeto elaborado por Melhem et al. (1984), que visa realizar a caracterização morfológica dos grãos de pólen das famílias ocorrentes na Reserva do Parque Estadual das Fontes do Ipiranga (PEFI), complementando assim os estudos taxonômicos realizados na mesma área, segundo
stomatal conductance, leaf area, leaf anatomy measures (width of palisade and spongy parenchyma, length of central vein, adaxial and abaxial width of central vein, length of vascular bundle, width of vascular bundle), and stem diameter. A higher tolerance was observed in BRS Valiosa RR to moderate hydric deficit conditions when they occurred in soybean stage V2. The BRS Valiosa RR cultivar presents a better morphologically and anatomically adaptive response to moderate hydric restrictions of up to (−0.07 MPa) when they occur in the first weeks of plant development.
Species from Utricularia sect. Foliosa and sect. Psyllosperma were studied based on seed characteristics. Our goals were to search for informative characters useful to species delimitations, especially for very polymorphic species such as U. amethystina, and also to provide an identification key and discussion about the delimitation of both sections. The qualitative characters of seeds were more useful than quantitative ones for taxonomic purposes but, as presented here in an identification key, it was impossible to distinguish three species from each other (Utricularia huntii, U. praelonga and U. tridentata). Our results are not enough for deep speculations about the delimitation of both sections. However, they do not agree with Taylor's system, because it was impossible to separate the studied species in two clearly different groups. However, the variability found in the seed characters was evaluated in this work and we also briefly discussed the ecologic implications of some seed traits.
-(Palynotaxonomy of Cordiaceae (Boraginales) from São Paulo State). The pollen morphology of 18 heterostylic species, representing 2 genera, of Cordiaceae from the state of São Paulo were investigated. The pollen grains were acetolyzed, measured, described and photomicrographed under light microscope, and when necessary, under scanning electron microscope. Cordia has 3-colporate pollen grains with long colpus and lalongate endoaperture, the exine is spiny to spinulate-verrucate. Varronia has 3-porate pollen grains and pores with operculum, the exine is reticulated, homobrochate to heterobrochate. In most of the species the pollen grains of the long-styled (pin) flowers have higher diameter values. Although Cordia and Varronia can be easily distinguished based on pollen morphology, both genera are stenopalynous and it is not possible to distinguish species based on pollen grains morphology, though different group of species have pollen grains with different average size, size measures overlap.
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