...Sofie Lindström Abstract The probable zygnematacean zygospore Tetranguladinium is recorded in Mesozoic strata from southern Scandinavia for the first time. Tetranguladinium , which exhibits morphological similarities to the extant filamentous green alga Mougeotia , occurs in Jurassic–Cretaceous (J...

.... (Zygospore); 22. Pseudoschizaea; 23. trilete fern spore; 24. lycopod sp.; 25, 26. Glomus sp.; 27. Diplodia sp.; 28. Curvularia sp.; 29. Nigrospora sp. MD. FIROZE QUAMAR was awarded a BSc (Hons.) in Botany from the R.D.S. College (Baba Saheb Bhimrao Ambedkar Bihar University-BRABU...

... hinterlands. However, fossil palynological assemblages also commonly contain pre-angiosperm palynomorphs without haptotypic features (e.g. a trilete mark), which are unlikely to have been produced by vascular land plants. Many of these types are similar to zygospores, spore-like propagules or other structures...

... envelope; it becomes a cyst, or zygospore, waiting to reproduce by dividing into haploid aplanospores (or zoospores if flagellated) or developing spirally arranged row of holes in the thickened cyst wall ( Fig. 1 .1–1.3, 1.5–1.7); 2 , zygospore ( Fig. 1 .11); 3 , aplanospores (or zoospores) are produced...

... sp. are the aquatic taxa, having on average 1% pollen. Ferns with an average of <1% pollen are present in this zone. Algal spores such as the zygospores of Zygnema sp. (average 1.5%) and Spirogyra sp. (average 0.5%) are scantily represented. The fungal remains range from 2.5 to 44...

.... Lecaniella sp. ( Spirogyra zygospore); slide L5c; 13 × 132.7; size 42 µm. 8. Resting egg of Artemia brine shrimp; slide L2b; 16.5 × 159; size 108 × 78 µm (×1000). 9. Colonial alga/Cyanobacteria; slide L1a; 5 × 145.5; size 69 × 55 µm. 10. Algal cyst (unidentified); slide L2c; 21.5 × 150; size 31 × 26 µm...

... is clearly manifested by the steady presence of Cerealia and other culture pollen taxa such as Chen/Am, Artemisia , Caryophyllaceae, Brassicaceae, Alternanthera and Cannabis sativa . The presence, though meagre, of freshwater algae Zygnema and Spirogyra (zygospores) as well as the aquatic taxa...

.... Chrozophora , 26. Typha latifolia , 27. Typha angustifolia , 28. Lemna , 29. Potamogeton , 30. Zygnema (Zygospores), 31. Spirogyra , (Zygospores), 32. Pseudoschizaea (Concentricystes) , 33. Alnus , 34. Ceratopteris , 35. Glomus , 36. Curvularia , 37. Tetraploa , 38. Microthyriaceae, 39...

..., Polygonum plebeium and P olygonum sp. indicates some sort of marshy area around the provenance of the samples. However, the aquatic taxa such as Typha sp., Lemna sp. and Potamogeton sp. as well as algal spores such as Pseudoschizaea sp., zygospores of Spirogyra , Zygnema and Utricularia sp...

... . Investigation into the differential corrosion susceptibility of pollen and spores . Pollen et Spores 6 : 621 – 635 . Havinga AJ. 1967 . Palynology and pollen preservation . Review of Palaeobotany and Palynology 2 : 81 – 98 . Head MJ. 1992 . Zygospores of Zygnemataceae (Division...

.... Polygala sp., 26. Typha latifolia , 27. Lemna sp., 28. Potamogeton sp., 29. Zygnema sp. (Zygospores), 30. Spirogyra sp., (Zygospores), 31. Monolete fern spore, 32. Trilete fern spore, 33. Glomus sp., 34. Curvularia sp., 35. Diplodia sp., 36. Cookeina sp., 37. Nigrospora sp., 38...

...-axis) for the Rolla lakes. Plate 1. 1, Botryococcus . 2, Pediastrum integrum . 3, P. boryanum var. pseudoglabrum . 4, Peridinium willeeii . 5, Sphaerocystis . 6, Scenedesmus . 7, Staurastrum . 8, Desmid zygospore, unknown affinity. 9, Pediastrum simplex var . clathratum...

... 13 fossil species of algae are recorded ( Table 2 ; Plate 2 ). Desmidiaceaesporites cosmarioformis , most probably related to desmids, is most common and it is present in most samples ( Figure 3 ). Single zygospores of Spirogyra (fossil genus Ovoidites ) are also encountered regularly...