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17 results for “megaspores”
Text-fig. 4. Dispersed megaspores on the surface of 1,000 mm2 of shale at Brymbo (a) with an enlargement showing Lagenicula horrida ZERNDT (b). in Why Lycospora Dominated Many Pennsylvanian Spore Assemblages
Text-fig. 4. Dispersed megaspores on the surface of 1,000 mm2 of shale at Brymbo (a) with an enlargement showing Lagenicula horrida ZERNDT (b).
Fig. 6. Spore morphology. A. S. kurzii megaspores from W.M in Selaginella subvaginata (Selaginellaceae), a new spikemoss from China
Fig. 6. Spore morphology. A. S. kurzii megaspores from W.M. Chu et al. 15682 (PE), B. S. kurzii microspores from W.M. Chu et al. 15682 (PE), C. S. repanda megaspores from K.H. Shing 06679 (PE01563529), D. S. repanda microspores from Y.M. Shui 139035 (PE00452047), E. S. subvaginata megaspores from Nanshuibeidiao Team 4374 (PE), F. S. repanda microspores from Nanshuibeidiao Team 4374 (PE), G. S. vaginata megaspores from X.C. Zhang. 0777 (PE00452208), H. S. vaginata microspores (30/30 μm) from X.C. Zhang 2250 (PE00452230). Scale bars = 200 μm (A and G), 100 μm (C and E), 30 μm (proximal in B, D, H, and distal in F), and 20 μm (distal in B, and proximal in F).
Text-fig. 5. Micro- and megaspores of quillwort (Isoëtes). Microspores: 1 – Isoëtes lacustris, WS 33, 2 – 3 Isoëtes, SJ 54, 4 – Isoëtes, SJ 56, 5 – Isoëtes, SJ 75. Megaspores: 6 – 8 Isoëtes, SJ 70. Localities WS Wielki Staw, SJ Stará Jímka Lake. Photo E. Břízová. in Quillwort (Isoëtes), A Mysterious Plant From The Czech Republic
Text-fig. 5. Micro- and megaspores of quillwort (Isoëtes). Microspores: 1 – Isoëtes lacustris, WS 33, 2 – 3 Isoëtes, SJ 54, 4 – Isoëtes, SJ 56, 5 – Isoëtes, SJ 75. Megaspores: 6 – 8 Isoëtes, SJ 70. Localities WS Wielki Staw, SJ Stará Jímka Lake. Photo E. Břízová.
Fig. 5 in Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina
Fig. 5. Paleogeographic map of the Late Cretaceous (modified from Blakey 2010) showing the known distribution of Arcellites disciformis (black symbols), and the new Patagonian record (white symbol).
Fig. 1 in Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina
Fig. 1. Geographic (A) and geological (B) maps of the studied area (Tres Lagos Town, Santa Cruz Province, Argentina), showing the location of the studied sections (modified from Varela 2011).
Fig. 4 in Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina
Fig. 4. Megaspores of the water fern Balmeisporites cf. B. holodictyus Cookson and Dettmann, 1958; Cenomanian, town of Tres Lagos, Argentina. A. MPM-Pb-18907a (H32/4), general view under light microscope. B. MPM-Pb-18907 SEM stub 1, general view under SEM, showing the larger reticulum in the equatorial region. C. MPM-Pb-18907a (Q49/1), detail of finely granulated lips. D. MPM-Pb-18907a (F39), general view of one individual with variations in reticulum development. E. MPM-Pb-18907a (J53/3), detail of the variations in reticulum development.
Fig. 3 in Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina
Fig. 3. Megaspores of the water fern Arcellites disciformis (Miner, 1935) Ellis and Tschudy, 1964; Cenomanian, town of Tres Lagos, Argentina. A. MPM- Pb-18907a (N40/1), general view under light microscope (A1), a detail of the pitted pattern (A2). B. MPM-Pb-18907 SEM stub 1, general view under SEM (B1), a detail of pitted surface under SEM (B2), a detail of wall in cross-section under SEM, showing the palisade structure of outer exoexine (B3). C. MPM-Pb-18907 SEM stub 3, detail of acrolamella under SEM, showing leaves with well-developed fimbriate margins (C1), detail of the reticulated tips of appendages (C2). D. MPM-Pb-18907 TEM, body of the spore showing wall-layers under TEM, with coarsely granulated outer exoexine, loosely and finely granulated inner exoexine and massive intexine (D1); detail showing ultra-thin channels (arrows) of intexine (D2). Abbreviations: Ot. Ex., outer exoexine; In. Ex., inner exoexine; Int., intexine.
Fig. 2 in Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina
Fig. 2. Stratigraphic sections of the Mata Amarilla Formation at Cerro Waring and Estancia Mata Amarilla localities, showing samples location. Abbreviations: c, conglomerate; cs, coarse sandstone; fs, fine sandstone; ht, heterolitic; m, mudstone; ms, medium sandstone.
Text-fig. 6. Scanning electron microscope (SEM) images of megaspores (a–c) and attached microspores (c, d) with possible affinities to Salviniales; Torres Vedras locality, Portugal. a) Lateral view of Molaspora sp. megaspore showing almost spherical body with a relatively long apical acrolamella; b) Apical view of Molaspora sp. megaspore showing almost spherical body with slightly twisted apical acrolamella; c, d) Lateral view of Arcellites punctatus megaspore showing coarsely rugulate body and apical acrolamella with attached microspores (d). Specimens, TV39-S174616 (a), TV38-S170224 (b), TV43-S170169 (c, d). Scale bars 100 Μm (a–c), 25 Μm (d). in The Early Cretaceous Mesofossil Flora Of Torres Vedras (Ne Of Forte Da Forca), Portugal: A Palaeofloristic Analysis Of An Early Angiosperm Community
Text-fig. 6. Scanning electron microscope (SEM) images of megaspores (a–c) and attached microspores (c, d) with possible affinities to Salviniales; Torres Vedras locality, Portugal. a) Lateral view of Molaspora sp. megaspore showing almost spherical body with a relatively long apical acrolamella; b) Apical view of Molaspora sp. megaspore showing almost spherical body with slightly twisted apical acrolamella; c, d) Lateral view of Arcellites punctatus megaspore showing coarsely rugulate body and apical acrolamella with attached microspores (d). Specimens, TV39-S174616 (a), TV38-S170224 (b), TV43-S170169 (c, d). Scale bars 100 Μm (a–c), 25 Μm (d).
Text-fig. 4. Scanning electron microscope (SEM) images of megaspores with possible affinities to Selaginellales; Torres Vedras locality, Portugal. a, b) Hughesisporites galericulatus, lateral view of megaspore (a) with almost smooth surface and spore wall of thin elements forming a dense reticulum (b); c) Trileites sp., proximal view of megaspore with almost smooth surface and raised trilete mark; d–f) Rugotriletes sp., proximal (e) and lateral (f) views of megaspores showing coarsely reticulate-rugulate surface ornamentation and prominent gula around the trilete mark and compact perforate spore wall (d); g, h) Erlansonisporites sp., distal (g) and lateral (h) views of megaspores showing coarsely reticulate-rugulate surface and fibrous spore wall; i, j) Striatriletes sp. 1, megaspore in oblique proximal view (i) showing raised laesurae and irregular striate-rugulate surface, and detail of spore wall (j) showing dense packing of sculptural elements; k, l) Striatriletes sp. 2, megaspore in proximal view (k) showing trilete mark, striate-rugulate surface, and detail of spore wall (l) composed of loosely packed fibers; m) Striatriletes sp. 3, megaspore in proximal view showing raised trilete mark and striate-rugulate surface; n, o) Verrutriletes sp., megaspore in oblique proximal view (n) showing short laesurae of the trilete mark, and the dense verrucate surface (o); p) Megaspore sp. 1, oblique proximal view showing in The Early Cretaceous Mesofossil Flora Of Torres Vedras (Ne Of Forte Da Forca), Portugal: A Palaeofloristic Analysis Of An Early Angiosperm Community
Text-fig. 4. Scanning electron microscope (SEM) images of megaspores with possible affinities to Selaginellales; Torres Vedras locality, Portugal. a, b) Hughesisporites galericulatus, lateral view of megaspore (a) with almost smooth surface and spore wall of thin elements forming a dense reticulum (b); c) Trileites sp., proximal view of megaspore with almost smooth surface and raised trilete mark; d–f) Rugotriletes sp., proximal (e) and lateral (f) views of megaspores showing coarsely reticulate-rugulate surface ornamentation and prominent gula around the trilete mark and compact perforate spore wall (d); g, h) Erlansonisporites sp., distal (g) and lateral (h) views of megaspores showing coarsely reticulate-rugulate surface and fibrous spore wall; i, j) Striatriletes sp. 1, megaspore in oblique proximal view (i) showing raised laesurae and irregular striate-rugulate surface, and detail of spore wall (j) showing dense packing of sculptural elements; k, l) Striatriletes sp. 2, megaspore in proximal view (k) showing trilete mark, striate-rugulate surface, and detail of spore wall (l) composed of loosely packed fibers; m) Striatriletes sp. 3, megaspore in proximal view showing raised trilete mark and striate-rugulate surface; n, o) Verrutriletes sp., megaspore in oblique proximal view (n) showing short laesurae of the trilete mark, and the dense verrucate surface (o); p) Megaspore sp. 1, oblique proximal view showing
Text-fig. 5. Scanning electron microscope (SEM) images of megaspores with possible affinities to Isoetales (a–d) and megaspores of uncertain affinity (e–i); Torres Vedras locality, Portugal. a) Paxillitriletes reticulatus megaspore in lateral view showing long appendages on the flanges of the laesurae and the reticulate-spiny distal surface; b) Dijkstraisporites sp. megaspore in oblique lateral view showing long, sometimes dichotomizing, appendages on the equatorial flanges and bordering the laesurae; c, d) Tenellisporites sp. megaspore in proximal view (c) showing equatorial flanges and laesurae with short, broad, flattened and unbranched appendages; note numerous, spiny microspores adhering to the proximal face of the megaspore (d); e) Megaspore type sp. 2 in lateral view showing apical gula and ornamentation of scattered spines; f, g) Megaspore type sp. 3 in lateral (f) and proximal (g) view showing broad, often dichotomously branched appendages covering the megaspore surface; h, i) aff. Flabellisporites sp. megaspores in proximal (h) and lateral (i) view showing long, narrow appendages covering the megaspore surface. Specimens, TV39-S174619 (a), TV38-S170220 (b), TV38-S170221 (c, d), TV44-S174574 (e), TV44-S174575 (f), TV44-S174577 (g), TV38-S170223 (h), TV38-S170222 (i). Scale bars 100 Μm (a–c, e–i), 25 Μm (d). in The Early Cretaceous Mesofossil Flora Of Torres Vedras (Ne Of Forte Da Forca), Portugal: A Palaeofloristic Analysis Of An Early Angiosperm Community
Text-fig. 5. Scanning electron microscope (SEM) images of megaspores with possible affinities to Isoetales (a–d) and megaspores of uncertain affinity (e–i); Torres Vedras locality, Portugal. a) Paxillitriletes reticulatus megaspore in lateral view showing long appendages on the flanges of the laesurae and the reticulate-spiny distal surface; b) Dijkstraisporites sp. megaspore in oblique lateral view showing long, sometimes dichotomizing, appendages on the equatorial flanges and bordering the laesurae; c, d) Tenellisporites sp. megaspore in proximal view (c) showing equatorial flanges and laesurae with short, broad, flattened and unbranched appendages; note numerous, spiny microspores adhering to the proximal face of the megaspore (d); e) Megaspore type sp. 2 in lateral view showing apical gula and ornamentation of scattered spines; f, g) Megaspore type sp. 3 in lateral (f) and proximal (g) view showing broad, often dichotomously branched appendages covering the megaspore surface; h, i) aff. Flabellisporites sp. megaspores in proximal (h) and lateral (i) view showing long, narrow appendages covering the megaspore surface. Specimens, TV39-S174619 (a), TV38-S170220 (b), TV38-S170221 (c, d), TV44-S174574 (e), TV44-S174575 (f), TV44-S174577 (g), TV38-S170223 (h), TV38-S170222 (i). Scale bars 100 Μm (a–c, e–i), 25 Μm (d).
Data from: Lycopsid megaspores from the Upper Triassic of Svalbard and their relationship to the floras and palaeoenvironments of northern Pangaea
Triassic megaspore assemblages from Svalbard, Arctic Norway, are described for the first time based on the analysis of the Upper Triassic (Carnian–Norian/Rhaetian) Kapp Toscana Group on the island of Hopen. Two megaspore zones are described: the late Carnian 'Dijkstraisporites beutleri Zone' (undifferentiated De Geerdalen Formation), and the Norian/Rhaetian 'D. beutleri – Verrutriletes preutilis Zone' (Svenskøya Formation). Megaspores are attributed to heterosporous lycopsids, and likely correspond to the microspore Aratrisporites, which was observed in palynological preparations. Megaspore occurrence was highest in delta-plain and associated with lake-mire deposits. However, their close association with marine microfossils suggests episodic marine influence, and is consistent with previous interpretations that some Triassic lycopsids occupied marginal marine habitats. The absence of megaspores in the overlying Hopen Member and Flatsalen Formation is likely related to a marine transgression during the early Norian, as indicated by the recovery of low diversity assemblages of agglutinated foraminifera. The transition to ostracod-dominated microfaunas in the middle part of the formation is consistent with a regionally extensive maximum flooding surface, prior to a return to megaspore-dominated assemblages in the fluvio-deltaic deposits of the Svenskøya Formation. Despite the abundance of their mega- and microspores, lycopsid fossils are almost entirely absent within palaeobotanical collections from the island, which we ascribe to their herbaceous habit and consequent low preservation potential. The results of this study show lycopsids to be an important component of the local ecosystem and thus contribute to a more complete understanding of the Late Triassic floras of northern-most Pangaea.
FIGURE 3. Biternatisporites compositus gen. & comb. nov. A–E in Biternatisporites gen. nov.-a new megaspore genus from the MiddleCarboniferous sediments of the Tunguska basin (Siberian platform, Russia)
FIGURE 3. Biternatisporites compositus gen. & comb. nov. A–E. General view of megaspores. A. Specimen no. 65, magnification ×42. B. Specimen no. 68, magnification ×42. C. Specimen no. 70 (holotype), magnification ×49. D. Specimen no. 70 (holotype), magnification ×185. E. Specimen no. 71, magnification ×58. F. Structure of large rays, specimen no. 70 (holotype), magnification ×2200. G. Structure of small rays, specimen no. 70 (holotype), magnification ×2200. Photographer: Iochannes Moeller, Alfred Wegener Institute for Polar and Marine Research, Potsdam.
FIGURE 2 in Biternatisporites gen. nov.-a new megaspore genus from the MiddleCarboniferous sediments of the Tunguska basin (Siberian platform, Russia)
FIGURE 2. Morphological structure and types of Late Paleozoic megaspores. A. Megaspore type I. B. Megaspore type II. C. Megaspore type III. The numbers indicate: 1. Area. 2. Gula. 3. Curvature. 4. Curvature crest. Photographer: Iochannes Moeller, Alfred Wegener Institute for Polar and Marine Research, Potsdam.
FIGURE 1 in Biternatisporites gen. nov.-a new megaspore genus from the MiddleCarboniferous sediments of the Tunguska basin (Siberian platform, Russia)
FIGURE 1. Map of the sampling location of Biternatisporites compositus gen. & comb. nov. in the northeast of the Tunguska Basin, Russia (●). (Map taken from Lethaea rossica. Russian Paleobotanical Journal 2: 56 [in Russian].)
Data from: Lycopsid megaspores from the Upper Triassic of Svalbard and their relationship to the floras and palaeoenvironments of northern Pangaea
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Data from: Mid-Cretaceous megaspore floras from Maryland, USA
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