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MY FAVOURITE PLANT COMMUNITY - SPHAGNETUM |
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by Keith Brocklehurst |
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[Balsam Post Issue 61 (October 2003) page 42.] |
First continuation page. |
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10. Vexillifera sp. A small amoeboid genus, vesicular nucleus. Long pseudopodia make it appear stellate when free-floating. Can bend long pseudopodia, but they shorten, as shown, when in contact with a solid surface. |
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11. Rotifer egg probably Lecane sp. which was in the cultures. Also 3 Vexillifera and other smaller unidentified amoebae. |
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12. Saccamoeba limax. Monopodial, 20 – 30 large crystals, vesicular nucleus, .rough uroid, 100µm long. A videocapture. |
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13. Thecamoeba verrucosa. Outer surface creased and rough-looking except when moving actively. Vesicular nucleus. Feeds on Scenedesmus, Have kept cultures mixed with A. proteus for long periods enriched with wheat grains. 90 – 120 µm. long. |
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14. Arcella discoides. Our first testate rhizopod. Oral view focussed mostly in cytoplasm, circular aperture (ap), 2 nuclei (N). Test in optical section. Dia. 96µm. |
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15. Arcella gibbosa.Test cracked, cytoplasm escaping (spherical mitochondria were visible in original image). Note unit structures of proteinaceous test, no siliceous plates (idiosomes) supporting the test or foreign particles (xenosomes) attached. |
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16. Nebela bohemica. All Nebelas are ± pear-shaped; a large genus. Compressed in PVAL mount to show plates (siliceous idiosomes) and a few mineral particles from the environment (xenosomes) both embedded in an organic matrix. Note the thickened collar at aperture (blue). |
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17. Nebela flabellulum The only species of Nebela which is broader than long.1 pseudopodium and organic clutter at aperture. From Cwm Idwal, Snowdonia, but common. |
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17a. N. flabellulum. High magnification of flattened, clean and empty test, all plates siliceous idiosomes, 2 layers distinguishable. |
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18. Pontigulaisia compressa An active specimen. Test darkly pigmented, mineral particles visible in V-shaped neck. Broad view of test. Length 200 – 250 µm. |
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19. P. compressa The same with test long axis almost at right angles to microscope stage. |
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• HOME • WHAT IS THE PMS? • WHAT'S NEW • CONTACTING US • CLUB MEETINGS • LIBRARY • ADDRESS BOOK • LETTERS •SALES AND WANTS BALSAM POST COLOUR SUPPLEMENT•SPRINGTAILS• MISCELLANEOUS•RELATED SITES • |