The Lichen Genus Bulbothricella, A New Segregate in the Parmeliaceae from Venezuela

1996 ◽  
Vol 28 (5) ◽  
pp. 421-430 ◽  
Author(s):  
Vicente Marcano ◽  
Sari Mohali ◽  
Ernesto Palacios-Prü ◽  
Antonio Morales Méndez
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
New Genus ◽  
Single Species ◽  
Anatomical Structure ◽  
Chemical Characters ◽  
Layer Chromatography ◽  
Scanning Electron

AbstractThe new genus Bulbothricella (Lichenized Ascomycotina,Parmeliaceae with the single species B. amazonensis (Marcano, Galiz & Morales) Marcano, Galiz, Morales & Mohali is segregated from Bulbothrix. This conclusion is based on an investigation of morphological, anatomical and chemical characters using scanning electron microscopy and thin-layer chromatography. The new genus is characterized by a pored epicortex, 12—14 spores per ascus, obovate and acrogenous conidia, and an anatomical structure and cortical chemistry resembling that of Bulbothrix..

scholarly journals Pseudohepatica duidensis, a new lichen from the venezuelan Amazonas

2000 ◽  
Vol 18 (1) ◽  
pp. 203-212 ◽  
Author(s):  
Vicente Marcano ◽  
Ernesto Palacios-Prü ◽  
Antonio Morales
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thin Layer ◽  
Cell Walls ◽  
Secondary Compounds ◽  
Lower Surface ◽  
Chemical Constituent ◽  
Layer Chromatography ◽  
Scanning Electron ◽  
Gyrophoric Acid

The species Pseudohepatica duidensis Marcano, Palacios & Morales is described from the Venezuelan Amazonas. Special attention has been paid to the morphology and the chemistry (e.g. polysaccharides and secondary compounds), using scanning electron microscopy (SEM), thin-layer chromatography (TLC, HPTLC) and iodine reagent tests. Pseudohepatica duidensis is characterized by a very small (to 1 mm long), yellowish-green thallus, non-pored epicortex, yellowish lower surface with soredial protuberances, paraplectenchymatous upper cortex consisting of strongly sclerotic cells, cell walls with iodine reactions characteristic of lichenan and gyrophoric acid as relevant chemical constituent.

scholarly journals Anatomía de la semilla de Tigridia pavonia (Iridaceae)

2017 ◽  
pp. 66
Author(s):  
Aída Carrillo-Ocampo ◽  
E.M. Engleman
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Thin Layer ◽  
Cell Walls ◽  
Histochemical Staining ◽  
Stage Of Development ◽  
Scanning Electron

With methods of light microscopy, histochemical staining and scanning electron microscopy, it was found that the ovule in the seed of Tigridia pavonia (Iridaceae) is anatropous, bitegmic, and crassinucellate. During development, the exotegmen is crushed and the endotegmen persists with tannins in the lumens and in the walls, which also react positively for lignin. The exotesta contains tannins and its outer walls are convex, thickened, and cuticularized. The mesotesta has multiple layers, accumulates abundant lipids, and forms a bulge in the chalaza. The cell walls of the endotesta collapse and accumulate tannins. In the chalaza, a hypostasal cushion contains tannins in the lumens and in the walls, which also react positively for lignin. At the micropylar end of the seed there is an operculum which consists of: a) a slightly crushed exotegmen, b) an endotegmen with cuticular thickenings that are concentric with respect to the micropyle, c) hemispherical deposists of cutin on the anticlinal walls of the endotegmen, and c) a thin layer of endosperm that covers the radicle. During its cellular stage of development, the endosperm has conspicuous transfer walls at the chalazal end next to the nucella. The embryo is small and has a conical cotyledon.

Jurassic conchostracans from Carapace Nunatak, southern Victoria Land, Antarctica

1994 ◽  
Vol 6 (1) ◽  
pp. 105-113 ◽  
Author(s):  
Shen Yanbin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Middle Jurassic ◽  
New Genus ◽  
New Genus And Species ◽  
Victoria Land ◽  
Number Of Individuals ◽  
Scanning Electron

Fossiliferous horizons of the Ferrar Group at Carapace Nunatak of southern Victoria Land have yielded the richest and most diverse freshwater Jurassic biota hitherto recorded from Antarctica. Fossil conchostracans are the most important in terms of number of individuals and distributional area. Scanning electron microscopy is used to establish a new genus and species (Carapacestheria balli), and Cyzicus (Lioestheria) disgregaris Tasch is attributed to Carapacestheria disgregaris (Tasch) emend. The conchostracan fauna of the Ferrar Group, characterized by Carapacestheria, is probably of early Middle Jurassic age.

Re-investigation of Polyoeca dichotoma and Acanthoeca spectabilis (Acanthoecidae: Choanoflagellida)

1984 ◽  
Vol 64 (4) ◽  
pp. 819-827 ◽  
Author(s):  
Shigemitsu Hara ◽  
Eiji Takahashif
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Type Species ◽  
New Genus ◽  
Three Dimensional ◽  
Electron Microscopical ◽  
Scanning Electron

Light and electron microscopical reinvestigation of Polyoeca dichotoma Kent revealed that Acanthoecopsis spiculifera Norris, the type species of the genus, is a synonym for Polyoeca dichotoma. Since this step invalidates the use of the name Acanthoecopsis, a new genus Acanthocorbis was established for the three species formerly included in Acanthoecopsis.The three dimensional arrangement of costal strips forming the loricae of Polyoeca dichotoma and Acanthoeca spectabilis Ellis were examined by scanning electron microscopy. The arrangement of costal strips were similar in both species. The longitudinal costal strips and those forming the spines were arranged outside the supplementary costae and those of the transverse bonds.

Simplified Procedure for Hand Fracturing, Identifying, and Curating Small Macrocharcoal Remains

IAWA Journal ◽  
2010 ◽  
Vol 31 (2) ◽  
pp. 139-147 ◽  
Author(s):  
Jeffrey R. Boutain ◽  
Adam R. Brown ◽  
David T. Webb ◽  
Bryson H. Toyofuku
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Maximum Amount ◽  
Anatomical Structure ◽  
Alternative Procedure ◽  
Evacuation Time ◽  
Amount Of Information ◽  
Plant Remains ◽  
Simplified Procedure ◽  
Scanning Electron

Charred plant remains are common and significant components of many archeological assemblages, and the proper identification of these remains is essential for an excavation team to gather the maximum amount of information. Identification of charred plant remains, especially of small pieces, can be difficult due to the brittle characteristics of charcoal and changes in anatomical structure due to charring. Charcoal must be snapped, which is difficult for small specimens, or sectioned with time consuming resin embedding procedures. This study presents an alternative procedure in which small (0.7 mm thick) charcoal specimens are produced, attached to specimen mounting stubs used in scanning electron microscopy (SEM), and then hand snapped. This procedure consistently produced flat viewing surfaces. It also reduced the air evacuation time in SEM and facilitated the production of replicas.

Molecular and morphological studies identify a new genus within the Heterolepismatinae (Zygentoma: Lepismatidae)

Zootaxa ◽  
2021 ◽  
Vol 5030 (1) ◽  
pp. 1-118
Author(s):  
GRAEME B. SMITH ◽  
ANDREW MITCHELL ◽  
RAFAEL MOLERO-BALTANÁS
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Anterior Margin ◽  
New Genus ◽  
Sequence Data ◽  
Morphological Characters ◽  
Type Series ◽  
Morphological Studies ◽  
Molecular Studies ◽  
Scanning Electron

Molecular studies using COI and 28S sequence data strongly identify a clade within the Heterolepismatinae distinct from the majority of species so far sequenced. The independence of the clade is supported by several morphological characters including a glabrous anterior margin to the frons, large trapezoidal thoracic sternites, tarsal trichobothria, long, conical parameres which in some species consist of two segments, and the presence of triangular or rounded subrectangular scales on the femora, tibia and clypeus. This clade is described as a new genus Visma n. gen. containing ten new species V. advenum n. sp., V. bingara n. sp., V. brayi n. sp., V. bundjalung n. sp., V. brigalowsum n. sp., V. capricornia n. sp., V. pallidum n. sp., V. powellheueri n. sp., V. tenebrosum n. sp. and V. xanthorrhoea n. sp.. Heterolepisma stilivarians Silvestri, 1908 is redescribed from the holotype and transferred to the new genus. The remaining H. stilivarians type series is found to be different to the holotype and removed from the type series. It is considered possible that H. annectens Silvestri, 1924 may also belong to this genus. Scanning electron microscopy of scale shape and rib-spacing is shown to be a useful tool to separate at least some species of the genus and considered to have greater potential if well preserved material is available.  

Tobolocella levinae n. gen., n. sp., a cheilostome bryozoan from the late Maastrichtian of northern Kazakhstan: scanning electron microscope and micro-CT study

2019 ◽  
Vol 294 (1) ◽  
pp. 91-101 ◽  
Author(s):  
Anna V. Koromyslova ◽  
Alexey V. Pakhnevich ◽  
Petr V. Fedorov
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
New Genus ◽  
Micro Ct ◽  
X Ray ◽  
Northern Kazakhstan ◽  
Ct Data ◽  
The Right ◽  
Scanning Electron

A cheilostome bryozoan Tobolocella levinae gen. et sp. nov. is described from a late Maastrichtian outcrop located on the right bank of the Tobol River in northern Kazakhstan. Its morphology is investigated in detail using combined scanning electron microscopy and X-ray micro-CT data. These studies reveal that colonies of this new genus generally consist of regularly arranged but morphologically different zooids: autozooids, T-zooids, and vicarious avicularia. The T-zooids first established in T. levinae gen. et sp. nov. are zooids with a modified cystid and can be interpreted as autozooidal polymorphs, if its polypide was identical to that of regular autozooids, or heterozooids, if its polypide was modified. The T-zooids probably can increase the distance between autozooidal polypides to improve their feeding efficiency.

scholarly journals Discovery of Ascomycete characteristics in Sporothrix schenckii

1973 ◽  
Vol 7 (6) ◽  
pp. 341-348
Author(s):  
M. Thibaut ◽  
M. Ansel
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cell Wall ◽  
Light Microscopy ◽  
New Genus ◽  
Sporothrix Schenckii ◽  
Perfect State ◽  
Scanning Electron

Sporothrix schenckii has been studied by light microscopy, and also by transmission and scanning electron microscopy. Characteristics of Ascomycetes have been oibserved at the level of the cell-wall and in the synaptic system of the hyphae. Also the perfect state has been discovered. The four spored asei are formed directly from the mycelium and there is no fructification. Dolichoascus schenckii is the name suggested for this perfect state which constitutes a new genus of the Endomycetaceae.

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