On the reliability of the growth rings in two species of the family Characidae in the Sudan

1984 ◽  
pp. 333-338
Author(s):  
S. A. Guma’a ◽  
M. E. Hamza ◽  
E. M. Suliman
Keyword(s):  
Growth Rings ◽  
The Family

scholarly journals WOOD OF BURSEROXYLON FOSSIL FROM BARA FORMATION OF RANI KOT FORT AREA, DISTRICT JAMSHORO SINDH, PAKISTAN

2020 ◽  
Vol 36 (1) ◽  
pp. 1-7
Author(s):  
J. Mangi ◽  
S. A. Khan ◽  
N. Soomro ◽  
H. Naz ◽  
M. Panhwer
Keyword(s):  
First Record ◽  
Fossil Wood ◽  
Three Dimension ◽  
Growth Rings ◽  
The Family ◽  
Anatomical Characters ◽  
Diffuse Porous

The paper describes a fossil wood identifiable as Burseroxylon baranesis from Bara formation of Sindh, Pakistan. Three dimension sections (transverse, radial and tangential) were prepared from the fossil wood collected from Bara formation, Ranikot. The anatomical characters such as presence of growth rings, parenchyma scanty, paratracheal, vasicentric. Rays are homogenous rays consist of procumbent cells indicate that the species belong to the family Burseraceae of petrified Bursera wood and are assigned name as Burseroxylon on the basis of form genus. This is the first record of genus Burseroxylon from tertiary rocks of Pakistan. Presence of diffuse porous wood indicate that the plants were growing in tropical type of climate.

SYSTEMATIC WOOD ANATOMY OF HUBERIA, MICONIA AND TIBOUCHINA (MELASTOMATACEAE)

IAWA Journal ◽  
2015 ◽  
Vol 36 (3) ◽  
pp. 326-337 ◽  
Author(s):  
Marcelo dos Santos Silva ◽  
Francisco de Assis Ribeiro dos Santos ◽  
Camilla Reis Augusto da Silva ◽  
Noélia Costa dos Santos ◽  
Lazaro Benedito da Silva
Keyword(s):  
Wood Anatomy ◽  
Fibre Length ◽  
Growth Rings ◽  
Anatomical Characteristics ◽  
Anatomical Classification ◽  
The Family ◽  
Vestured Pits

The wood anatomy of Huberia consimilis, Miconia amoena, M. mirabilis, M. rimalis and Tibouchina francavillana (Melastomataceae) is described and compared with other species from the same genera. All taxa share vestured pits, absent or inconspicuous growth rings, septate fibres, parenchyma-like tangential bands, and fibres shorter than 900 μm which is characteristic of the family Melastomataceae. Each species exhibited a set of wood anatomical characteristics that enabled its identification. Some traits were more relevant in distinguishing genera, such as composition of parenchyma-like tangential bands, vessel-ray pits, ray width, rays per millimetre and fibre length. Parenchyma-like tangential bands are described in great detail, and we propose a more specific nomenclature for their anatomical classification.

Wood Anatomy of the Bignoniaceae, with a Comparison of Trees and Lianas

IAWA Journal ◽  
1991 ◽  
Vol 12 (4) ◽  
pp. 389-415 ◽  
Author(s):  
Peter Gasson ◽  
David R. Dobbins
Keyword(s):  
Wood Anatomy ◽  
Secondary Xylem ◽  
Unit Area ◽  
Xylem Anatomy ◽  
Diameter Class ◽  
Growth Rings ◽  
The Family ◽  
Perforation Plates ◽  
Helical Thickenings ◽  
Anomalous Growth

The secondary xylem anatomy of trees and lianas was compared in the family Bignoniaceae. General descriptions of the family and the six woody tribes are provided. Lianas belong to the tribes Bignonieae, Tecomeae and Schlegelieae, and most have ve.ssels of two distinct diameters, many vessels per unit area, large intervascular pits, septate fibres, large heterocellular rays often of two distinct sizes, scanty paratracheal and vasicentric axial parenchyma and anomalous growth. Conversely, trees, which belong to the tribes Coleeae, Crescentieae, Oroxyleae and Tecomeae generally have narrower vessels in one diameter class, fewer vessels per unit area, smaller intervascular pits, non-septate fibres, small homocellular rays, scanty paratracheal, aliform or confluent parenchyma, and none exhibits anomalous growth. The majority of both trees and Hanas possess growth rings, are diffuse-porous, have non-solitary vessels which lack helical thickenings, and few have apotracheal parenchyma or storied structure. All species have alternate intervascular pitting and simple perforation plates.

scholarly journals Late Paleocene woods from Cherokee Ranch, Colorado, U.S.A.

2019 ◽  
Vol 54 (1) ◽  
pp. 33-46 ◽  
Author(s):  
Elisabeth A. Wheeler ◽  
Peter K. Brown ◽  
Allan J. Koch
Keyword(s):  
New Genus ◽  
Early Eocene ◽  
Denver Basin ◽  
Growth Rings ◽  
Stratigraphic Sequence ◽  
The North ◽  
Late Paleocene ◽  
The Family ◽  
New Type ◽  
Almost All

ABSTRACT Fossil woods are common in the Late Cretaceous through early Eocene rocks of the Denver Basin, Colorado. The overwhelming majority of these woods are dicotyledonous angiosperms. A new locality for fossil woods, Cherokee Ranch, in the upper D1 stratigraphic sequence (Denver Formation) is described, and evidence for it being late Paleocene is reviewed. Most Cherokee Ranch woods resemble previously described Denver Basin angiosperm woods, but there is one new type of wood attributed to the family Lauraceae. A new genus, Ubiquitoxylon, is proposed for woods with the combination of features commonly seen in the Cherokee Ranch woods. Denver Basin Paleocene woods differ from Paleocene wood assemblages to the north (Wyoming and Montana), where conifer woods are common and angiosperms are rare. The width and spacing of the water-conducting vessels and the lack of distinct growth rings in almost all of the Cherokee Ranch woods suggest that these trees did not experience water stress, and there was no pronounced seasonality.

On the reliability of the growth rings in two species of the family Characidae in the Sudan

Hydrobiologia ◽  
1984 ◽  
Vol 110 (1) ◽  
pp. 333-338
Author(s):  
S. A. Guma'a ◽  
M. E. Hamza ◽  
E. M. Suliman
Keyword(s):  
Growth Rings ◽  
The Family

Triassic sponges (Sphinctozoa) from Hells Canyon, Oregon

1988 ◽  
Vol 62 (03) ◽  
pp. 419-423 ◽  
Author(s):  
Baba Senowbari-Daryan ◽  
George D. Stanley
Keyword(s):  
Endemic Species ◽  
Upper Triassic ◽  
Island Arc ◽  
Tropical Island ◽  
The Family ◽  
Wallowa Terrane ◽  
Unique Condition ◽  
Hells Canyon

Two Upper Triassic sphinctozoan sponges of the family Sebargasiidae were recovered from silicified residues collected in Hells Canyon, Oregon. These sponges areAmblysiphonellacf.A. steinmanni(Haas), known from the Tethys region, andColospongia whalenin. sp., an endemic species. The latter sponge was placed in the superfamily Porata by Seilacher (1962). The presence of well-preserved cribrate plates in this sponge, in addition to pores of the chamber walls, is a unique condition never before reported in any porate sphinctozoans. Aporate counterparts known primarily from the Triassic Alps have similar cribrate plates but lack the pores in the chamber walls. The sponges from Hells Canyon are associated with abundant bivalves and corals of marked Tethyan affinities and come from a displaced terrane known as the Wallowa Terrane. It was a tropical island arc, suspected to have paleogeographic relationships with Wrangellia; however, these sponges have not yet been found in any other Cordilleran terrane.

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