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searching for Megaspore 36 found (78 total)

alternate case: megaspore

Isoetes acadiensis (180 words) [view diff] exact match in snippet view article find links to article

in length, covered one sixth to one third by the velum. The spherical megaspores are 400-570 micrometers in diameter, and bear smooth ridges. The kidney

Isoetes tuckermanii (238 words) [view diff] exact match in snippet view article find links to article

unspotted, 5 millimeters long, and 3 millimeters wide. The white spherical megaspores are 400 to 650 micrometers in diameter, and bear rough-crested ridges

Lyginopteridales (1,994 words) [view diff] exact match in snippet view article find links to article

seed megaspore within the nucellus. In some, however, three other, aborted megaspores were still present that together with the functional megaspore represented

Isoetes (3,841 words) [view diff] exact match in snippet view article find links to article

general appearance. The best way to identify them is by examining their megaspores under a microscope. Moreover, habitat, texture, spore size, and velum

Sporogenesis (1,018 words) [view diff] exact match in snippet view article find links to article

meiosis, producing four megaspores. Only one is a functional megaspore whereas the others stay dysfunctional or degenerate. The megaspore undergoes several

Salviniales (671 words) [view diff] exact match in snippet view article find links to article

heterosporous, meaning that they produce two different types of spore (megaspores and microspores) that develop into two different types of gametophyte

Apomixis (2,740 words) [view diff] exact match in snippet view article find links to article

apomixis in flowering plants: Nonrecurrent apomixis: In this type "the megaspore mother cell undergoes the usual meiotic divisions and a haploid embryo

Ginkgo yimaensis (261 words) [view diff] exact match in snippet view article find links to article

8-12 mm in width. G. yimaensis also had pedicels 15-16 mm in length. The megaspore membrane of G. yimaensis and G. biloba are similar. However, it appears

Lepidodendrales (4,009 words) [view diff] exact match in snippet view article find links to article

spiralling pattern, and megasporangium each containing a single functional megaspore that germinates inside the sporangium. Many of these different plant organs

Abies balsamea (3,276 words) [view diff] exact match in snippet view article find links to article

occurs and a megaspore is produced as the first cell of the megagametophyte. As cell division takes place the nucleus of the megaspore thickens, and

Robbedale Formation (103 words) [view diff] exact match in snippet view article find links to article

doi:10.1016/S1631-0683(03)00009-5. E. B. Koppelhus and D. J. Batten. 1992. Megaspore assemblages from the Jurassic and lowermost Cretaceous of Bornholm, Denmark

Bagå Formation (119 words) [view diff] exact match in snippet view article find links to article

Sweden". GEF. 131:1. 137-146 E. B. Koppelhus and D. J. Batten. 1992. Megaspore assemblages from the Jurassic and lowermost Cretaceous of Bornholm, Denmark

Ultramicrotomy (607 words) [view diff] exact match in snippet view article find links to article

Low magnification of an ultra-thin section (length = 0.5 mm) of a megaspore of Salvinia cucullata (intermediate lens micrograph taken with the ZEISS TEM

Borucice Formation (2,261 words) [view diff] exact match in snippet view article find links to article

super-greenhouse effect in the atmospheric system. Moreover, the mass occurrence of megaspore Paxillitriletes phyllicus correlate with the mentioned pulses and thus

Aerva javanica (532 words) [view diff] exact match in snippet view article find links to article

in the ovule and hence reduction division does not take place in the Megaspore mother cell. The diploid egg is unfertilized and forms the embryo. Hence

Salvinia (821 words) [view diff] exact match in snippet view article find links to article

megasporangia that are few in number (approximately 10), each with single megaspore, or many microsporangia, each with 64 microspores. Spores are of two kinds

Rabekke Formation (234 words) [view diff] exact match in snippet view article find links to article

Scandinavia. GFF 126:325-330 E. B. Koppelhus and D. J. Batten. 1992. Megaspore assemblages from the Jurassic and lowermost Cretaceous of Bornholm, Denmark

Aachen Formation (351 words) [view diff] exact match in snippet view article find links to article

"On megaspores, Charophyta fruits and some other small fossils from the Cretaceous", The Palaeobotanist, 8: 8–18 Dijkstra, S. J (1949), "Megaspores and

Medullosales (2,220 words) [view diff] exact match in snippet view article find links to article

produced from the top of the trunk among the crown of fronds. The seed megaspore was surrounded by two layers of tissue: a vascularised nucellus and a

2023 in paleobotany (10,776 words) [view diff] exact match in snippet view article find links to article

S.; Feng, Z. (2023). "Morphology and wall ultrastructure of a unique megaspore, Flabellisporites zhaotongensis Sui, McLoughlin et Feng sp. nov., from

Paleobiota of the Ciechocinek Formation (5,779 words) [view diff] exact match in snippet view article find links to article

recovered changed from pollen grains during the Upper Pliensbachian to megaspores, indicating a climatic change from moderate and relatively dry to warm

Nucellar embryony (1,217 words) [view diff] exact match in snippet view article find links to article

Figure 1. depicts the process of nucellar embryony. A) begins with megaspore formation. B) shows the nucellus and forming of cells, nucellar embryonic

Dioon (2,705 words) [view diff] exact match in snippet view article find links to article

(micropyle) is very small, leaving only a narrow opening on the Nucellus. The megaspore sheath thickened from 3–4.5 microns in the young ovule to 9-10 microns

Sorthat Formation (6,346 words) [view diff] exact match in snippet view article find links to article

marker beds. The rocks were originally dated as Middle Jurassic using megaspore contents, with the Levka and Sorthat beds being roughly contemporaneous

Selaginella apoda (1,850 words) [view diff] exact match in snippet view article find links to article

the American continent and have one type of sporophyll in the form of a megaspore network. In the family Selaginellaceae, microsporangia are larger than

Nemegt Formation (4,155 words) [view diff] exact match in snippet view article find links to article

Krassilovl, V. A.; Makulbekovl, N. M. (1996). "Isoetalean megasporophylls with megaspores from the Upper Cretaceous of Mongolia" (PDF). Review of Palaeobotany and

Ciechocinek Formation (9,508 words) [view diff] exact match in snippet view article find links to article

preservation not determinate (Probably Modiolus sp.). The Paxitriletes phyllicus megaspore is found in great numbers. Deposits of the Ciechocinek Formation are related

Marion Elizabeth Stilwell Cave (2,935 words) [view diff] exact match in snippet view article find links to article

John M. (February 1966). "A new interpretation of the structure of the megaspore membrane in some gymnospermous ovules". Botanical Journal of the Linnean

Drzewica Formation (6,310 words) [view diff] exact match in snippet view article find links to article

Formation of Pomerania and in other equivalent units from all Poland. This Megaspore section of relatively poor compared with the lower and upper sections

2022 in paleobotany (10,663 words) [view diff] exact match in snippet view article find links to article

history for the group. Surangea mohgaoensis, originally interpreted as fern megaspores, is reinterpreted as angiosperm fruits by Ramteke et al. (2022). Zhang

Arabinogalactan protein (8,964 words) [view diff] exact match in snippet view article find links to article

Jean-Philippe (April 2013). "The Classical Arabinogalactan Protein AGP18 Mediates Megaspore Selection in Arabidopsis". The Plant Cell. 25 (4): 1274–1287. doi:10.1105/tpc

Zagaje Formation (2,252 words) [view diff] exact match in snippet view article find links to article

plant detritus, and layers of coal and numerous finds of miospores and megaspores. The local presence of charcoal fragments and high concentrations of PAHs

2014 in paleobotany (4,397 words) [view diff] exact match in snippet view article find links to article

Pedersen; Federica Marone (2014). "Arcellites punctatus sp. nov.: a new megaspore from the Early Cretaceous of Portugal studied using high resolution synchrotron

Blanowice Formation (3,441 words) [view diff] exact match in snippet view article find links to article

Formation, being all four sequences are of Pliensbachian age, documented by megaspores (Horstisporites). On the upper strata, “sub-coal beds" cover the sequence

2015 in paleobotany (7,169 words) [view diff] exact match in snippet view article find links to article

"Morphology and wall ultrastructure of a new and highly distinctive megaspore from the Middle Jurassic of Yorkshire, UK". Review of Palaeobotany and

2019 in paleobotany (15,021 words) [view diff] exact match in snippet view article find links to article

Quetglas; Cecilia Macluf; Mercedes di Pasquo (2019). "Morphology of the megaspore Lagenoisporites magnus (Chi and Hills 1976) Candilier et al. (1982), from