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Corrientes, Argentina

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. Source

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. Source

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. Source

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. Source

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. Source

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