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 کاملA New Triterpene Acid from the Fern Notholaena grayi
Previous studies on several specimens of N. grayi Davenp. have revealed, in the white frond exudate, flavonoid aglycones which form a con stant pattern [1], It was indicated later, in a tabu lated survey of 23 specimens of N. grayi, that a fur ther unknown flavonoid occurs in every species, in small or in trace amount [2], When bulk material, collected in Arizona, was processed for the isola...
متن کاملA New Pentaoxygenated Xanthone from the Fern Cystopteris fragilis
Pharmacological activity (e.g. antipsychotic ac tion [1]) and chemotaxonomic interest of xanthones may explain the increasing interest in these substances in recent years. It has been suggested [2] that Cystopteris fragilis complex is the most inter esting biosystematic problem in ferns. Xanthone analysis may be of interest in the study of relation ships of the taxa of this complex since pre...
متن کاملAdiantum shastense, a new species of maidenhair fern from California
A new species of Adiantum is described from California. This species is endemic to northern California and is currently known only from Shasta County. We describe its discovery after first being collected over a century ago and distinguish it from Adiantumjordanii and Adiantumcapillus-veneris. It is evergreen and is sometimes, but not always, associated with limestone. The range of Adiantumshas...
متن کاملAdetogramma (Polypodiaceae), a new monotypic fern genus segregated from Polypodium
Polypodiaceae is one of the most diverse and abundant families of ferns in tropical and subtropical forests. Despite multiple studies investigating its phylogeny and taxonomy, several generic boundaries within the family still need clarification. One of the most problematic circumscriptions is that of Polypodium L., and one species that still contributes to this uncertainty is Polypodium chryso...
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ژورنال
عنوان ژورنال: American Fern Journal
سال: 1910
ISSN: 0002-8444
DOI: 10.2307/1543986