234 



YORKSHIRE NATURALISTS UNION. 



octocornis, Arlhrodesmiis 

 GidogoniaceiO, Family 

 CEdogonium, Genus 

 Okeni, Oscillatoria ... 

 oligacanthum, StaurasU'um 

 olivaceum, Gomphonema 

 O'Mearii, Stauraslriim 

 Onychonema, Genus 

 Oocardium, Genus ... 

 Oocystis, Genus 

 opalinum, Nostoc ... 

 operculata, Cyclotella 

 Ophioeytium, Genus 

 orbicularis, Coleocbfete 

 orbiculatum, Cosmarium 

 ordinaiium, Zygnema 

 ordinata, Hormospora 

 ordinatum, Cosmarium 

 orichalcea, Melosira 

 urnatum, Cosmarium 



Staurastrum 



ornitlioceplialum, Characium 

 orthonotum, Closterium 

 orthostichum, Cosmarium 

 Oscillarioide^e, Sub-Family 

 oscillarioides, Anabiena 



Spirulina 



Oscillatoria, Genus ... 

 oscitans, Micrasterias 

 ovale, Cosmarium ... 

 ovalis, Amphora 



Navicula 



Surirella 



ovata, Surirella 

 oviforme, Dictyosphierium 

 oxyacanthum, Staurastrum 

 oxyrhyncus, Synedra 

 pachyderma, Alicrospora 

 pachydermum, Cosmarium 

 Palangula, Cosmarium 

 I'alea, Nittschia 

 jjallidus, Chroococcus 

 I'almella, Genvis 

 Palmellacese, Family 

 Palmodactylon, Genus 

 paludosa, Amphiprora 

 Pandorina, Genus ... 

 panduriforme, Cosmarium 

 panduriformis, Oocystis 



Surirella 



jianniforme, Stigonema 

 papillifera, Micrasterias 

 papillosum, Spondylosium 

 papyrinum, Phormidium 

 paradoxa, Nitzschia... 

 paradoxum, Staurastrum 



174 



Tian.-,, V.N.U., 1901 (pull. July 1901). lioi. Serie.-,, Vul. 5. 



