224 



YORKSHIRE NATURALISTS' UNION. 



INDEX. 



abljreviala, Microspoia 

 abbrevialiim , Cosmarium 

 abrupUmi, Closterium 



■ Cosmarium 



abundans, Scenedesmus 

 acarides, Staurastnim 

 acerosum, Closterium 

 AchnanthcEe, Family 

 Achnanthes, Genus... 

 Achnanthidium, Genus 

 aciculare, Closterium 



Rhaphidium 



acicularis, Nitzschia... 



Synedra ... 



aciculifera, Trochiscia 

 aciculiferum . Staurastrum 

 acrosphffiria, Navicula 

 acrosporum, CEdogonium 

 aculeatum, Staurastrum 



Xanthidium 



acuminata, Navicula 



Nitzschia 



acuminatum, Characium 



Gomphonema 



Pleurosigma 



Selenastrum 



Acus, Synedra 



acuta, Navicula 



SpirotKnia ... 



Stauroneis 



acutiformis, Scenedesmus 

 acutius, Desmidium . . . 

 acutum, Closterium ... 



Staurastrum 



acutus, Scenedesmus 

 segagroijila, Cladophora 



Tolypothrix 



jequalis, Hormiscia ... 



Synedra 



Eeruginea, Merismopedia 

 terugineo-ccerulea, Lyngbya 



Ti-ans. Y.N.U., lyoi (pub. July 1901). Hot. Series, Vol. 5. 



