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9 results for “tracheid”
Text-fig. 5. Lithocarpoxylon ashwillii sp. nov., UF 279-24544. a, b: Semi-ring porous wood, exclusively solitary vessels in a radial/ diagonal arrangement, diffuse axial parenchyma, TS. c: Homocellular rays composed of procumbent cells; vasicentric tracheids; vessel elements with simple perforation plates (PP), TLS. d: Vessel-ray parenchyma pits (VRP) with reduced borders, vertical, RLS. e: Crystalliferous axial parenchyma strand (C) with a single crystal per chamber; ray with procumbent cells, RLS. f: Aggregate ray (right) composed of loosely associated 1–2-seriate rays, TLS. g: Uniseriate rays, thin-walled tyloses in vessels, vasicentric tracheids (VT). Lithocarpoxylon sp., UF 279-84864. h, i: Semi-ring porous wood, exclusively solitary vessels in radial arrangement. j: Aggregate ray and uniseriate rays. k: Scalariform perforation plate with fewer than 10 bars. l: Vessel-ray parenchyma pits with reduced borders to simple, vertical. Scale bars: 200 µm in a, b, f, h, j; 100 µm in c, i; 50 µm in d. e; 20 µm in k, l. in A Diverse Assemblage Of Late Eocene Woods From Oregon, Western Usa
Text-fig. 5. Lithocarpoxylon ashwillii sp. nov., UF 279-24544. a, b: Semi-ring porous wood, exclusively solitary vessels in a radial/ diagonal arrangement, diffuse axial parenchyma, TS. c: Homocellular rays composed of procumbent cells; vasicentric tracheids; vessel elements with simple perforation plates (PP), TLS. d: Vessel-ray parenchyma pits (VRP) with reduced borders, vertical, RLS. e: Crystalliferous axial parenchyma strand (C) with a single crystal per chamber; ray with procumbent cells, RLS. f: Aggregate ray (right) composed of loosely associated 1–2-seriate rays, TLS. g: Uniseriate rays, thin-walled tyloses in vessels, vasicentric tracheids (VT). Lithocarpoxylon sp., UF 279-84864. h, i: Semi-ring porous wood, exclusively solitary vessels in radial arrangement. j: Aggregate ray and uniseriate rays. k: Scalariform perforation plate with fewer than 10 bars. l: Vessel-ray parenchyma pits with reduced borders to simple, vertical. Scale bars: 200 µm in a, b, f, h, j; 100 µm in c, i; 50 µm in d. e; 20 µm in k, l.
Text-fig. 3. Schema of radial section of G. rudolphii (sample 99/04). t – tracheid, r – ray, bp – bordered pit, tp – taxodioid cross-field pit, gp – glyptostroboid cross-field pit. in New Fossil Woods From The Paleogene Of Doupovské Hory And České Středohoří Mts. (Bohemian Massif, Czech Republic)
Text-fig. 3. Schema of radial section of G. rudolphii (sample 99/04). t – tracheid, r – ray, bp – bordered pit, tp – taxodioid cross-field pit, gp – glyptostroboid cross-field pit.
Text-fig. 7. Schema of radial section of T. gypsaceum (sample 98/04). t – tracheid, r – ray, bp – bordered pit, tp – taxodioid pit, cp – cupressoid pit. in New Fossil Woods From The Paleogene Of Doupovské Hory And České Středohoří Mts. (Bohemian Massif, Czech Republic)
Text-fig. 7. Schema of radial section of T. gypsaceum (sample 98/04). t – tracheid, r – ray, bp – bordered pit, tp – taxodioid pit, cp – cupressoid pit.
Text-fig. 2: Microscopic photo of the wood from Kučlín (specimen No. G 4723, NM, transverse section) shoving growth ring boundary with markedly rounded tracheids and abundant axial parenchyma (dark cells) present both in late- and earlywood (scale bar = 100 µm). in Silicified Stem From The Late Eocene Fossil Locality Of Kučlín (Czech Republic): Overview And New Remarks
Text-fig. 2: Microscopic photo of the wood from Kučlín (specimen No. G 4723, NM, transverse section) shoving growth ring boundary with markedly rounded tracheids and abundant axial parenchyma (dark cells) present both in late- and earlywood (scale bar = 100 µm).
Fig. 8. Plant cuticles and tracheids from the Ivanye Zolote section. GIUS 4−3592. A. Cosmochlaina verrucosa Edwards, 1986 in Palynology and microfacies of Lower Devonian mixed carbonate-siliciclastic deposits in Podolia, Ukraine
Fig. 8. Plant cuticles and tracheids from the Ivanye Zolote section. GIUS 4−3592. A. Cosmochlaina verrucosa Edwards, 1986; IZ−7 sample. B. Nematothallus sp.; IZ−7 sample. C. Nematothallus sp.; IZ−1 sample. D–G. Nematothallus? like structures. D, E. IZ−6 sample. F, G. IZ−1 sample. H–I. Porcatitubulus annulatus Burges and Edwards, 1991. H. IZ−5 sample. I. IZ−4 sample. J. Laevitubulus sp.; IZ−1 sample. K. Porcatitubulus annulatus Burges and Edwards, 1991; IZ−5 sample.
Data from: An Early Devonian actinostelic euphyllophyte with secondary growth from the Emsian of Gaspé (Canada) and the importance of tracheid wall thickening patterns in early euphyllophyte systematics
<p>Secondary growth is a tracheophyte structural feature whose earliest known occurrence dates to the late Pragian-early Emsian. <i>Armoricaphyton</i>, <i>Franhueberia</i> and an unnamed plant from eastern Canada represent the only instances of secondary growth documented to date for the Early Devonian. Here, we describe a new Early Devonian euphyllophyte exhibiting secondary growth, from the Emsian (c. 400-395 Ma) Battery Point Formation (Québec, Canada): <i>Gmujij</i> <i>tetraxylopteroides</i> gen. et sp. nov. is characterized by a mesarch actinostele with <i>Psilophyton</i>-type (P-type) tracheid wall thickenings and exhibits a new type of anatomical organization among Early Devonian wood-producing euphyllophytes. <i>Gmujij</i> differs from coeval euphyllophytes, but lack of data on branching patterns, reproductive structures and other traditional diagnostic features preclude classification among previously recognized euphyllophyte groups. We experiment with a numerical approach to tracheid size distributions, to compare <i>Gmujij</i> with younger euphyllophytes exhibiting secondary growth. Comparisons show similarity between <i>Gmujij</i> and aneurophytalean progymnosperms, such as <i>Tetraxylopteris</i>. However, its plesiomorphic P-type tracheids set apart<i> Gmujij</i> from younger actinostelic euphyllophytes, raising questions on the importance of tracheid thickening patterns as diagnostic characters separating major lineages. Answers to this question hinge on whether transitions between wall thickening patterns require simple or complex changes in developmental regulation, a matter that requires improved understanding of regulatory programs that determine tracheid thickening patterns. Irrespective of these, <i>Gmujij</i> adds a new component to the diversity of anatomically preserved plants known in the Early Devonian, an incompletely explored interval of tracheophyte anatomical diversification, contributing information that will help understanding of the evolutionary origins of secondary growth.</p>
Data from: An Early Devonian actinostelic euphyllophyte with secondary growth from the Emsian of Gaspé (Canada) and the importance of tracheid wall thickening patterns in early euphyllophyte systematics
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Text-fig. 6. Quercus sp. Red Oak, UF 279-24550. a, b: Wood semi-ring-porous to diffuse-porous; vessels exclusively solitary; thinwalled tyloses in wide vessels; diffuse, diffuse-in-aggregates axial parenchyma; rays of two distinct sizes. TS. c: Rays of two distinct sizes, TLS. d: Vessel-vasicentric tracheid pitting, RLS. e: Vessel-ray parenchyma pitting with reduced borders, vertically elongate, RLS. f: Narrow rays 1-2 cells wide, TLS. g: Ray composed of procumbent cells, RLS. Scale bars: 200 µm in a, b, c; 50 µm in d, f, g; 20 µm in e. in A Diverse Assemblage Of Late Eocene Woods From Oregon, Western Usa
Text-fig. 6. Quercus sp. Red Oak, UF 279-24550. a, b: Wood semi-ring-porous to diffuse-porous; vessels exclusively solitary; thinwalled tyloses in wide vessels; diffuse, diffuse-in-aggregates axial parenchyma; rays of two distinct sizes. TS. c: Rays of two distinct sizes, TLS. d: Vessel-vasicentric tracheid pitting, RLS. e: Vessel-ray parenchyma pitting with reduced borders, vertically elongate, RLS. f: Narrow rays 1-2 cells wide, TLS. g: Ray composed of procumbent cells, RLS. Scale bars: 200 µm in a, b, c; 50 µm in d, f, g; 20 µm in e.
Text-fig. 5. Schema of radial section of T. gypsaceum (sample Bečov 2). t – tracheid, r – ray, bp – bordered pit, tp – taxodioid pit, cp – cupressoid pit, c – crassulae. in New Fossil Woods From The Paleogene Of Doupovské Hory And České Středohoří Mts. (Bohemian Massif, Czech Republic)
Text-fig. 5. Schema of radial section of T. gypsaceum (sample Bečov 2). t – tracheid, r – ray, bp – bordered pit, tp – taxodioid pit, cp – cupressoid pit, c – crassulae.
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