Arbo M.M.,Institute Botanica del Nordeste
PhytoKeys | Year: 2017
A neotype is designated for Clytostoma sciuripabulum, the basionym of Bignonia sciuripabulum, the presently accepted name of the species. © Maria M. Arbo.
Gonzalez A.M.,Institute Botanica del Nordeste |
Mauseth J.D.,University of Texas at Austin
International Journal of Plant Sciences | Year: 2010
The vegetative body of Lophophytum leandrii is a "tuber" that completely lacks all vegetative organs typically found in photosynthetic plants. Tubers have a warty surface zone composed of parenchyma cells and brachysclereids; there is no epidermis. The interior of the tuber is a matrix of parenchyma cells and a ramified network of collateral vascular bundles. Ingrowths are abundant in vessels. Tubers grow diffusely by proliferation of parenchyma cells in the matrix and in vascular bundles and by a vascular cambium within each bundle. There are no apical meristems. The innermost portion of the surface zone is also a meristematic region, with warts enlarged by cell proliferation within their centers. The attachment point with Parapiptadenia rigida is a discrete woodrose: a "coralloid" interface caused by localized proliferation of host wood. Infection causes many changes in P. rigida wood development, most of which favor the success of the parasite. The only defensive reaction is that the host stops producing sieve tube members near the infection site. The woodrose and coralloid interface of L. leandrii seem to be intermediate between the simple interface of Helosis, and the elaborate chimeral interfaces of Balanophora and Langsdorffia. © 2010 by The University of Chicago. All rights reserved.
Aptroot A.,ABL Herbarium |
Ferraro L.I.,Institute Botanica del Nordeste |
Da Silva Caceres M.E.,Federal University of Sergipe
Lichenologist | Year: 2015
Five new species of corticolous pyrenocarpous lichens are described from tropical and subtropical forests in the Chaco and Misiones provinces in NE Argentina: Aspidothelium submuriforme with globose, grey ascomata and ascospores mostly 7-septate with 0-2 oblique longitudinal septa, 25-28×8-10 m; Pyrenula inspersoleucotrypa, characterized by a thallus without pseudocyphellae, aggregated ascomata, an inspersed hamathecium, and ascospores of 17-20×6·5-8·0 m with diamond-shaped lumina; Pyrenula punctoleucotrypa, which has a thallus with pseudocyphellae, aggregated ascomata in a conical pseudostroma, with fused ostioles, not inspersed hamathecium, and ascospores of 10-12×4-5 m with rounded lumina; Strigula muriconidiata, containing immersed pycnidia with hyaline, densely muriform, ellipsoid conidia, 90-103×32-35 m; Trypethelium globolucidum, forming sessile pseudostromata with black and whitish parts, an inspersed hamathecium, ascospores 13-19-septate, (65-)83-97×11·5-14·5 m, lumina rounded to lentiform and containing lichexanthone. © British Lichen Society 2014.
Plants used by "guaranies" from misiones Province (Argentina) to make and improve musical instruments [Plantas usadas por los guaraníes de Misiones (Argentina) para la fabricación y el acondicionamiento de instrumentos musicales]
Keller H.A.,Institute Botanica del Nordeste
Darwiniana | Year: 2010
This ethnobotanical research includes plant resources used by "guaranies" from Misiones Province, Argentina, to make musical instruments. These instruments, used in religious ceremonies and other traditional celebrations are described. The plants used to make them are listed. "Guaranies" names, procedures to acquire and application of these plant resources are also provided.
Robledo G.,Institute Botanica del Nordeste |
Seijo G.,Institute Botanica del Nordeste
Theoretical and Applied Genetics | Year: 2010
Arachis hypogaea is an allotetraploid species with low genetic variability. Its closest relatives, all of the genus Arachis, are important sources of alleles for peanut breeding. However, a better understanding of the genome constitution of the species and of the relationships among taxa is needed for the effective use of the secondary gene pool of Arachis. In the present work, we focused on all 11 non-A genome (or B genome sensu lato) species of Arachis recognized so far. Detailed karyotypes were developed by heterochromatin detection and mapping of the 5S and the 18S-25S rRNA using FISH. On the basis of outstanding differences observed in the karyotype structures, we propose segregating the non-A genome taxa into three genomes: B sensu stricto (s. s.), F and K. The B genome s. s. is deprived of centromeric heterochromatin and is homologous to one of the A. hypogaea complements. The other two genomes have centromeric bands on most of the chromosomes, but differ in the amount and distribution of heterochromatin. This organization is supported by previously published data on molecular markers, cross compatibility assays and bivalent formation at meiosis in interspecific hybrids. The geographic structure of the karyotype variability observed also reflects that each genome group may constitute lineages that have evolved through independent evolutionary pathways. In the present study, we confirmed that Arachis ipaensis was the most probable B genome donor for A. hypogaea, and we identified a group of other closely related species. The data provided here will facilitate the identification of the most suitable species for the development of prebreeding materials for further improvement of cultivated peanut. © Springer-Verlag 2010.
Ferraro L.I.,Institute Botanica del Nordeste |
Michlig A.,Institute Botanica del Nordeste
Lichenologist | Year: 2013
Abstract Four new species of lichenized fungi from northern Argentina are described and illustrated: Coenogonium albomarginatum Michlig & L. I. Ferraro, C. brasiliense L. I. Ferraro & Michlig, C. flavovirens L. I. Ferraro & Michlig, and C. verrucosum Michlig & L. I. Ferraro. In addition, C. isidiatum (G. Thor & Vězda) Lücking et al., C. magdalenae Rivas Plata, Lücking & Lizano, C. persistens (Malme) Lücking et al., C. pusillum (Mont.) Lücking et al., and C. weberi (Vězda) Lücking et al. are recorded for the first time from South America. The known distribution of 24 species of this lichen genus is extended. A revision of the genus in Argentina and Paraguay is also presented. © British Lichen Society, 2013.
Anatomy and development of the staminate flower, microsporogenesis and microgametogenesis of species of lophophytum (balanophoraceae) in Argentina [Anatomía y desarrollo de la flor estaminada, microsporogénesis y microgametogénesis en especies de lophophytum (balanophoraceae) en la Argentina]
Gonzalez A.M.,Institute Botanica del Nordeste
Boletin de la Sociedad Argentina de Botanica | Year: 2013
The anatomy and development of the staminate flowers, microsporogenesis and microgametogenesis of Lophophytum leandrii and Lophophytum mirabile subsp. bolivianum, were studied. The aim of this work was to provide data for knowledge and taxonomy of the genus. The staminate flowers differ between species in the number and position of perianth parts and anther shape, which are important characteristics in the taxonomy of this genus. The perianth parts are formed by parenchyma covered by a single-layered epidermis. The anther wall consists of epidermis, a multilayered endothecium (with dual origin), middle layer and single-layered secretory tapetum (with dual origin). The microspore tetrads are tetrahedral; the pollen grains are tricolpate and sincolpate with a thin exine layer. Pollen grains are shed at two-celled state. The reductions that characterize the tuber also occur in male flowers, which present "perianth pieces", lacking the typical structure of sepals or petals. Although these holoparasitic are characterized by aberrant vegetative body, and devoid of the typical organs or meristems, the microgametogenesis and microsporogenesis develop normally.
Michlig S.A.,Institute Botanica Del Nordeste |
Ferraro L.I.,Institute Botanica Del Nordeste
Mycotaxon | Year: 2010
Parmotrema pseudocrinitum is reported for the first time in South America, from northern Argentina. A description of this species and comparisons with related species are presented. A key to species of Parmotrema with ciliate isidia and maps of their distribution are included.
Sosa M.M.,Institute Botanica del Nordeste
Boletin de la Sociedad Argentina de Botanica | Year: 2012
The typical variety has been cited in previous studies for Argentina, and the other variety, chilensis, was mentioned so far in Chile. This work rules out the typical variety in the country, describes its geographical distribution and cites for the first time the var. chilensis for Argentina. A description, illustration and a map of distribution of the species with these two varieties are provided, as well as a key to distinguish the other Argentinean species.
Salas R.M.,Institute Botanica del Nordeste |
Cabral E.L.,Institute Botanica del Nordeste
Plant Ecology and Evolution | Year: 2011
Background - The genus Staelia (Rubiaceae) remains imperfectly known. As part of the revision of the genus by the first author, a new species is here described and illustrated. Methods - Normal practices of herbarium taxonomy were used to study all the herbarium material available. Key results - Staelia culcita R.M.Salas & E.L.Cabral, a new species from Brazil, is described and illustrated. The new taxon is apparently endemic to the Espinhaço mountain range, Minas Gerais, in campos rupestres montane savannas. It resembles Staelia hatschbachii in its small habit but differs in the opposite and narrowly elliptic leaves with ciliate base (vs. whorled linear leaves with glabrous base), the corolla lobes that are distinctly shorter than the corolla tube (vs. corolla lobes equal or longer than corolla tube), the calyx lobes that are much shorter than the corolla tube (vs. calyx lobes longer than corolla tube) and the reticulo-papillate seed coat surface (vs. reticulo-foveate seed coat surface). Conservation assessment - The species is only known from three localities, representing two locations. Based on the restricted area of occupancy and extent of occurrence and based on the continuing decline in area, extent and quality of habitat, the species should be considered as Endangered: EN B1a,b(iii) + B2a,b(iii). © 2011 National Botanic Garden of Belgium and Royal Botanical Society of Belgium.