A Taxonomic Monograph of Equisetum Subgenus Equisetum

Hauke, Richard L.

doi:10.1127/nova.hedwigia/30/1979/385

Cited by 114 publications

(176 citation statements)

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“…Spores are unknown. nov. is identical to the one that is present on extant species of both modern subgenera, e.g., Equisetum diffusum Don, 1825, Equisetum telmateia Ehrhart, 1783 and Equisetum variegatum Schleicher, 1797 (Hauke, 1963(Hauke, , 1978(Hauke, , 1985. In the leaf whorls of living species of Equisetum, the central cells of the commissural region (C-cells, Hauke, 1985) acquire their particular shape beginning with cuboidal cells that undergo successive divisions to attain rectangular and ultimately tangentially elongated shapes, the divisions of the C-cells being always transverse (Hauke, 1985).…”

Section: Systematic Paleontologymentioning

confidence: 56%

“…This division is supported by numerous morphological characters, such as: (1) stomatal position and ornamentation, (2) branching pattern, (3) chromosome size, (4) strobilus apex, (5) stem dimorphism, (6) antheridial morphology, (7) lamellae type, (8) endodermis type, (9) cell wall texture of root hairs and (10) free leaf tips persistence (Milde, 1867;Hauke, 1963Hauke, , 1978Page, 1972a,b;Duckett, 1979;Emons, 1986). Molecular phylogenetic analyses recovered the monophyly of the Hippochaete clade, but not that of the Equisetum clade (Des Marais et al, 2003;Guillon, 2004Guillon, , 2007 due largely to the inconsistent placement of Equisetum bogotense Kunth, 1815 in different studies (see Guillon, 2007 and references therein).…”

Section: Fossil Representatives Of Equisetum Have Been Variouslymentioning

confidence: 99%

“…Equisetum has a nearly worldwide distribution, with Australia, Antarctica, New Zealand and several South Pacific islands being the only regions without natural populations of the genus (Hauke, 1963).…”

mentioning

confidence: 99%

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Reconstruction and Phylogenetic Significance of a NewEquisetumLinnaeus Species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)

et al. 2015

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Abstract. We describe Equisetum dimorphum sp. nov. from the Lower Jurassic of Chubut Province, Patagonia, Argentina. This new species is based on fertile and vegetative remains preserved as impressions of stems, leaves, strobili, transversal sections of the stems showing their anatomy, and terminal pagoda-like structures. The fine-grained sedimentary matrix also preserved detailed impressions of epidermal features. The morphological characters allow a whole-plant reconstruction and assignment to Equisetum. Equisetum dimorphum sp. nov. shows a mosaic of morphological characters that are commonly present in other Mesozoic forms and representatives of the two extant Equisetum subgenera, e.g., sunken stomata and a blunt strobilus apex. Compared to other well-known Mesozoic equisetalean taxa, Equisetum dimorphum sp. nov. appears to be most closely related to a group of Jurassic Equisetum-like plants including Equisetum laterale Phillips and Equisetites ferganensis Seward. Additional evidence for the morphological stasis of the fertile and vegetative organs of extant horsetails is supplied with this new material, adding further support to the hypothesis that the extant horsetails are a successful group that has undergone only little morphological changeover time and that has been present, nearly worldwide, since Jurassic times.Key words. Equisetales. Equisetum. Systematic. Jurassic. Patagonia. Resumen. RECONSTRUCCIÓN E IMPLICANCIAS FILOGENÉTICAS DE UNA NUEVA ESPECIE DE EQUISETUM LINNAEUS DEL JURASICO INFERIORDE CERRO BAYO (PROVINCIA DEL CHUBUT, ARGENTINA). En el presente trabajo se describe Equisetum dimorphum sp. nov., una nueva equisetal del Jurásico Inferior de la Provincia del Chubut, Patagonia, Argentina. Esta nueva especie está basada tanto en restos vegetativos como fér-tiles, preservados como impresiones y moldes de ejes, hojas, estróbilos, secciones transversales de los ejes mostrando su anatomía y estructuras terminales de tipo "pagoda". El grano fino del sedimento ayudó a preservar también impresiones detalladas de caracteres epidér-micos. Los caracteres morfológicos preservados permiten la reconstrucción de la planta y su asignación a Equisetum. La relación de E. dimorphum sp. nov. con otras equisetales del Mesozoico es discutida. Equisetum dimorphum sp. nov. muestra un mosaico de caracteres morfológicos que comúnmente se encuentran presentes en distintos representantes de los dos subgéneros de Equisetum, e.g., estomas hundidos y un ápice estrobilar romo. En comparación con otros taxones bien conocidos de equisetales del Mesozoico, Equisetum dimorphum sp. nov. parece estar más cercanamente emparentado con un grupo de plantas de tipo Equisetum del Jurásico, que incluye a Equisetum laterale Phillips y Equisetites ferganensis Seward. Se aporta evidencia adicional acerca del estasis morfológico de los órganos fértiles y vegetativos de Equisetum actuales, añadiendo de esta manera mayor sustento a la hipótesis que sugiere que Equisetum es un género exitoso que no ha cambiado mucho morfológicamente a través del t...

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Section: Systematic Paleontologymentioning

confidence: 56%

Section: Fossil Representatives Of Equisetum Have Been Variouslymentioning

confidence: 99%

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Reconstruction and Phylogenetic Significance of a NewEquisetumLinnaeus Species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)

et al. 2015

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“…Equisetum Hippochaete (Milde) Baker (Hauke, 1963(Hauke, , 1978, Equisetum s.str. Hippochaete Milde (Farwell, 1916;Rothmaler, 1944).…”

unclassified

New for the flora of Russia records of horsetail hybrid Equisetum x lofotense Lubienski

Феоктистов¹,

Gureyeva²,

Mochalov³

2016

Systematic notes on the materials of P.N. Krylov Herbarium of T

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The present study provides information on the findings of a hybrid Equisetum × lofotense Lubienski in Omskaya oblast of Russian Federation (Western Siberia). Morphological differences from the putative parents, results of the study of stem surface ultrastructure using scanning electron microscope are demonstrated. This finding is second record of this hybrid worldwide, and first record in Siberia and Russia on the whole. Besides that, closer examination of herbarium specimens in P.N. Krylov Herbarium (TK, Tomsk State University) revealed one more sample with the same features. New records of new for Russian flora E.

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“…A relict of these former woody horsetail trees is the free sporing herbaceous modern horsetail, the genus Equisetum known to consist of about 15 species [5,6]. Although the diversity of this plant group drastically declined during the Permian, a few forms exhibited unexpected adaptations [7] and persisted in some regions close to the Permian-Triassic mass extinction event [8].…”

mentioning

confidence: 99%