Results 131 to 140 of about 838 (164)
The genus Isoëtes L. (Lycophyta, Isoëtaceae): synthesis of karyological data
Webbia, 2001 Summary A synthesis of relevant karyological data regarding the genus Isoetes is given, with an up-to-date check list of chromosome numbers including 152 records referring to 67 taxa (62 species and 5 infraspecific taxa) and 16 hybrids. Total of different chromosome counts (considering two or more cytotypes for certain taxa, excluding hybrids) is 80 ...
Angelo Troia
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Lycophyta da borda oeste do Pantanal, Mato Grosso do Sul, Brasil [PDF]
Acta Botanica Brasilica, 2009 Este trabalho apresenta o tratamento taxonômico para as espécies de Lycophyta da região da borda oeste do Pantanal sul-matogrossense. Duas famílias estão presentes na área, Lycopodiaceae e Selaginellaceae, com cinco e seis espécies respectivamente. São apresentadas chaves de identificação, descrições das famílias, gêneros e espécies, ilustrações, bem ...
Paulo Henrique Labiak
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Flow cytometry confirms reticulate evolution and reveals triploidy in Central European Diphasiastrum taxa (Lycopodiaceae, Lycophyta) [PDF]
Annals of Botany, 2011 Interspecific Diphasiastrum hybrids have been assumed to be homoploid and to produce well-formed spores serving sexual reproduction. If this were the case, forms intermediate between hybrids and parents or hybrid swarms should be expected. The purpose of this study was: (1) to check whether homoploidy consistently applies to the three hybrids ...
Karsten Horn, Jörg Fuchs
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Lycophyta e samambaias do Parque Nacional da Serra do Itajaí, Vale do Itajaí, SC, Brasil [PDF]
Hoehnea (revista), 2010 Este trabalho apresenta o levantamento das espécies de Lycophyta e samambaias do Parque Nacional da Serra do Itajaí, Santa Catarina. O Parque possui, no total, 57.475 ha, com altitudes que variam de 150 a 940 m, sendo coberto por Floresta Ombrófila Densa.
André Luís de Gasper
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Megaspore wall in Lycophyta-ultrastructure and function
Review of Palaeobotany and Palynology, 1995Abstract New contributions on megaspore walls in the genus Selaginella are presented. The study was carried out with electron microscopy (SEM and TEM), light microscopy including phase and differential interference contrast, fluorescence and confocal microscopy.
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Review of Palaeobotany and Palynology, 2003
Abstract The general morphology, organization, structure and ornamentation of the sporoderm of megaspores and microspores of Isoetes savatieri Franchet have been studied with a stereoscopic microscope, light microscopy, transmission and scanning electron microscopy.
C.C. Macluf, M.A. Morbelli, G.E. Giudice
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Abstract The general morphology, organization, structure and ornamentation of the sporoderm of megaspores and microspores of Isoetes savatieri Franchet have been studied with a stereoscopic microscope, light microscopy, transmission and scanning electron microscopy.
C.C. Macluf, M.A. Morbelli, G.E. Giudice
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Ultrastructural analysis of sporoderm development in megaspores ofSelaginella galeottii (Lycophyta)
Plant Systematics and Evolution, 1991Structural members within the exospore ofSelaginella galeottii suggestive of those present at maturity are first detectable when the exospore is approximately 5 µm in thickness. Subsequent changes in successively larger sporangia involve a gradual size increase of the component units simultaneously throughout the exospore.
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