Contribuição ao estudo palinologico das Malpighiaceae A.L. Jussieu do Brasil (tribo banisterieae, Subtribo banisteriinae)

AUTOR(ES)
DATA DE PUBLICAÇÃO

1988

RESUMO

The pollen morphology of 148 species of Malpighiaceae (tribe Banisterieae, subtribe Banisteriinae) from Brazil, were studied. These species are of the genera: Aspicarpa Rich. (1 speciesl, Banisteriopsis Robins. ex Small (44 species), Camarea St. Hil. (6 species), Heteropterys H.B.K. (56 species), Janusia Adr. Juss. (1 species), Lophopterys Adr. Juss. (1 species), Peixotoa Adr. Juss. (14 speciesl, Schwannia Endl. (3 species) and Stigmaphyllon Adr. Juss. (22 species 1. The pollen grains of nlne genera were grouped into three morphological types according to aperture form: a- colporate type: Banisteriopsis lutea, B. prae cox, B. valvata, Heteropterys aureo-sericea and H. coleoptera. b- porate type: H. conformis, H. crinigera, H. patens, H. sanctorum and H. thyrsoidea. c- poratejcolpoidate type : presen t in species studied of genera: Aspicarpa, Banisteriopsis, Camarea, Heteropterys, Janusia, Lophopterys: Peixotoa, Schwannia and Stigmaphyllon. The aperture type, presence or not of colpoids, and their distribution on the pollen grain surface made it possible to group the species of most genera into palynological subtypes. From the results obtained it was verified that the genera Banisteriopsis, Heteropterys and tigmaphyllon are eurypalnous, Camarea and Peixotoa are stenopalynous, Aspicarpa, , Janusia,Lophopterys and Schwania require palynological and taxonomic studies of a greaternumber of species and specimens so as to permit a definitive conclus ion. According to the literature, the species with oolporate pollen grains should be the most primitive, and those with porate or poratejcolpoidate pollen grains , the most advanced in the family Malpighiaceae. The correlation between inflorescence type and colporate or porate aperture showed the evolutionary path of these characters to be inverted. It was also verified that the geographical distribution of species with colporate or porate (without colpoids) pollen grains is different, the former are extensively distributed in the North, Northeast, South and Center- West regions of Brazil, in a variety of vegetation types, while the latter prevail in forests from Bahia to São Paulo. Those species with porate/colpoidate pollen grains occur over almost the whole of Brazil, many of them in different habitats on the Central Plateau (mainly Banisteriopsis and Peixotoa) . Some variability of morphology was observed in the genera studied however, the characters analyzed are specific, and are often difficult to see and interpret under the light microscope, thus being only of limited use for taxonomic purposes.

ASSUNTO(S)

palinologia - brasil polen - analises botanica - classificação

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