Gametófitos de Pleurosorus papaverifolius (Kunze) Fée (Aspleniaceae) y Cheilanthes glauca (Cav.) Mett. (Pteridaceae), dos helechos rupícolas sudamericanos
نویسندگان
چکیده
منابع مشابه
Gaga, a New Fern Genus Segregated from Cheilanthes (Pteridaceae)
Ongoing molecular phylogenetic studies of cheilanthoid ferns confirm that the genus Cheilanthes (Pteridaceae) is polyphyletic. A monophyletic group of species within the hemionitid clade informally called the “C. marginata group” is here shown to be distinct from its closest relatives (the genus Aspidotis) and phylogenetically distant from the type species of Cheilanthes. This group is here seg...
متن کاملToward a monophyletic Cheilanthes: The resurrection and recircumscription of Myriopteris (Pteridaceae)
The fern genus Cheilanthes (Pteridaceae) has perplexed taxonomists for more than two centuries. Complex patterns of evolution involving rampant morphological convergence, polyploidy, hybridization, and apomixis have made the taxonomy of this group especially difficult. Fortunately, recent phylogenetic analyses have helped to clarify relationships among cheilanthoid taxa. Based on these findings...
متن کاملDeciphering the origins of apomictic polyploids in the Cheilanthes yavapensis complex (Pteridaceae).
Deciphering species relationships and hybrid origins in polyploid agamic species complexes is notoriously difficult. In this study of cheilanthoid ferns, we demonstrate increased resolving power for clarifying the origins of polyploid lineages by integrating evidence from a diverse selection of biosystematic methods. The prevalence of polyploidy, hybridization, and apomixis in ferns suggests th...
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Cheilanthes persicaیکی از سرخس‌های رستاخیزی است که در طول تنش خشکی کاملاً خشک و بعد از آبیاری احیا میشود. این نمونه از کرمانشاه (طاق بستان، غرب ایران) جمع‌آوری و در اتاق رشد کشت و چرخه زندگی آن مورد بررسی قرار گرفت. هاگ به حالت تتراد چهارگوشه‌ای با تزیینات مشبک ریز ناپیوسته است.
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The content of this paper is the proposal of two techniques for the modeling of skin color in images using a combination of spaces of colors HSV with YCbCr and HSV with CIELab. To determine the intervals of pixels nonskin color uses the components H and S, on the other hand, the intervals of pixels skin color uses the components Cb, Cr, a and b. There are compared the results of the technique H...
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ژورنال
عنوان ژورنال: Acta Botanica Brasilica
سال: 2009
ISSN: 0102-3306
DOI: 10.1590/s0102-33062009000300021