Probrevaxones, a new pollen group for the first brevaxones form-genera from the upper cenomanian of portugal (dedikált példány) [antikvár]

Acta Botanica Academiae Scientiarum Hungaricae, Vol. 27 (3 4), pp. 383402 (1981)PROBREVAXONES, A NEW POLLEN GROUP FOR THE FIRST BREVAXONES FORM-GENERA FROM THE UPPER CENOMANIAN OF PORTUGALByM. Kedves and F. Dinizdepartment of botany, józsef attila university, szeged, hungary and museu e laboratörio mineralógico e geológico faculdade de ciencias,lisboa, portugal(Received January 9, 1980)During our investigations of the Upper Cenomanian strata of Vila Flor we have observed large numbers of pollen grains of the Brevaxones type which exhibit a primitive germinal area. Essentially the germinal aperture is tricolporate with no vesti-bulum or other form of differentiation. The exoaperture is a relatively short furrow and there is no infratectal and/or foot layer separation. Description of several new taxa are given including the new form genera Bolchovitinaepollenites, Laingipollenites, SamoilovichaepoUenites, Medusipolhnifes and VilaflorpoUenites. Morphological analysis of the Probrevaxones shows that the pollen genera included here represent a stage of evolution, which encompasses a number of different evolutionary lines. The transition between the tricolporate {Longaxones) and Brevaxones occurs in several ways. In this respect the heterogenous character of the Normapolles is clear.IntroductionThe first reports on the spore-pollen assemblages of Vila Flor and CarrajSo were published in 1974/1977 by Diniz, Kedves and Simoncsics. A Turonian age for the assemblages was suggested. Sole de Porta (1978) described a spore-pollen assemblage from Oviedo. The strata from this locality are dated as Upper Cenomanian (Rotalipora greenhornensis Zone) based on the foraminiferal studies of Mendbnez Fernandez. Because the spore-pollen assemblages of Oviedo and Vila Flor are so similar we now believe that the Vila Flor strata are probably Upper Cenomanian.We are engaged in a wide-ranging palynological investigation of the sporomorphs of the Upper Cretaceous of Portugal and have now finished the study of the angiosperm pollen grains from Vila Flor. In this paper the first Brevaxones will be discussed for which we have created new taxa. Discussions and descriptions of the Normapolles and Longaxones will be published at a later date.Material and methodsLocality descriptions and other sample information were published earlier (see Diniz, Kedves and Simoncsics 1974/1977). Preliminary light microscope investigations took about two months. The second stage of qualitative and quantitative analysis of the slides was done using oil immersion (obj. n = lOOx). TEM studies were done parallely with the light microscope investigations and SEM studies are in progress.Acta Botanica Academiae Scientiarum Hungaricae 27, 1981