A Guide to Selected Genera of the British Desmids Click on genus name for description. Scale information is given below each image as equivalent width of the image in µm.

Genus Euastrum

Euastrum insigne 85 µm Euastrum humerosum 109 µm Euastrum bidentatum 49 µm

Genus Micrasterias

Micrasterias jenneri 152 µm Micrasterias denticulata 243 µm Micrasterias crux-melitensis 121 µm

Genus Cosmarium

Cosmarium obtusatum 64 µm Cosmarium botrytis 78 µm Cosmarium depressum 57 µm

Genus Staurastrum

Staurastrum sexangulare var. supernumerarium 116 µm Staurastrum paradoxum var. cingulum 91 µm Staurastrum gladiosum 54 µm

Genus Xanthidium

Xanthidium subhastiferum 95 µm Xanthidium antilopeum 99 µm Xanthidium cristatum 85 µm

Genus Staurodesmus

Staurodesmus controversus 37 µm Staurodesmus bulnheimii 69 µm Staurodesmus incus 36 µm

Genus Tetmemorus

Tetmemorus brebissonii 232 µm Tetmemorus granulatus 198 µm

Genus Closterium

Closterium setaceum 345 µm Closterium costatum 444 µm Closterium lunula 695 µm

Genus Penium

Penium margaritaceum 156 µm Penium cucurbitinum 82 µm

Genus Gonatozygon

Gonatozygon monotaenium 326 µm Gonatozygon brebissonii 132 µm Gonatozygon kinahani 177 µm

Genus Pleurotaenium

Pleurotaenium trabecula 250 µm Pleurotaenium tridentulum 96 µm

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