Radek Walkowiak

Unido: 14.feb.2019 Última actividad: 25.may.2020

Scientific Member, Program Manager and Botanist, The International Equisetological Association (IEA), World Equisetum Program, Research Service .. Passionate about plant biology, specifically in plant systematics, taxonomy of Equisetum, Equisetaceae, Tortula muralis complex, Marchantia polymorpha ssp. ruderalis (complex thallose liverworts), botanical nomenclature and history of botanical explorations and discovery ..

“It is believed that the genus Equisetum developed in the Tertiary, arising from the much older genus Equisetites, originating in the Paleozoic era - Permian or Carboniferous. The Triassic species Equisetites arenaceus was initially included in the genus Equisetum. Some fossil species of the genus Equisetites resemble modern horsetails so much that the generic distinction between Equisetum and Equisetites was questioned and it was suggested that Equisetum may be considered the oldest modern vascular plant” ..

“According to phylogenetic analyzes carried out by Jean-Michel Guillon, the most basal representative of the genus is Equisetum bogotense. Incorporating it in the Equisetum subgenus not including the Hippochaete subgenus makes this subgenus a paraphyletic taxa” ..

“Equisetaceae [Michx. ex DC.] The only modern representative is the genus Equisetum [L.] Fossil plants of this family are usually classified as Morphotaxon Equisetites. These include morphologically diverse plants known from different continents, found mainly in Triassic and younger rocks, rarely already Carboniferous” ..

“The first Equisetum-Equisetites species appeared in the upper Devon about 375 million years ago. The genus Equisetum can therefore be called living fossils” ..

“Equisetales [DC. ex Bercht. & J. Presl] Four families, of which only Equisetaceae have modern representatives. These plants occur on Earth from the Devonian, but played a special role in the Carboniferous vegetation. Plants of various sizes, from small herbaceous plants to extinct calamites reaching about 20 (30) m high. The following taxa are distinguished: Calamitaceae (+Asterocalamitaceae), Equisetaceae, Tchernoviaceae, Gondwanostachyaceae (Formerly: +Phyllothecaceae, +Schizoneuraceae). Fossil taxa with an unclear taxonomic position: Annularia, Schizoneura, Neocalamites, Spaciinodum” ..

“Equisetopsida [C. Agardh] (Sphenopsida) The class is fossil, living representatives are classified in one genus - Equisetum. Taxonomy: Equisetidae [(Warm.) / Engl. & Gilg], Equisetales [(Dumort.) / DC. ex Bercht. & J. Presl], Equisetineae [Rabenh.], Equisetaceae [Michx. ex DC.], Equisetum [L.] /// Hyeniales, Hyeniaceae /// Sphenophyllales [Seward], Sphenophyllaceae, Cheirostrobaceae /// Calamitales, Calamitaceae [Unger]” ..

“Equisetophyta [(D. H. Scott) / B. Boivin] (Sphenophyta) The group is fossil, living representatives are classified in one genus - Equisetum. Taxonomy: Equisetophytina [Reveal] (Sphenophytina), Equisetopsida [C. Agardh] (Sphenopsida)” ..

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