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MY FAVOURITE PLANT COMMUNITY - SPHAGNETUM

by Keith Brocklehurst

[Balsam Post Issue 61 (October 2003) page 42.]

First continuation page.





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.



11. Rotifer egg probably Lecane sp. which was in the cultures. Also 3 Vexillifera and other smaller unidentified amoebae.



12. Saccamoeba limax. Monopodial, 20 – 30 large crystals, vesicular nucleus, .rough uroid, 100Ám long. A videocapture.



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 Ám. long.



14. Arcella discoides. Our first testate rhizopod. Oral view focussed mostly in cytoplasm, circular aperture (ap), 2 nuclei (N). Test in optical section. Dia. 96Ám.



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.



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).



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.



17a. N. flabellulum. High magnification of flattened, clean and empty test, all plates siliceous idiosomes, 2 layers distinguishable.



18. Pontigulaisia compressa An active specimen. Test darkly pigmented, mineral particles visible in V-shaped neck. Broad view of test. Length 200 – 250 Ám.



19. P. compressa The same with test long axis almost at right angles to microscope stage.

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