2.^6 



YORKSHIRE NATURALISTS' UNION. 



rectangulaiis, Bulbochjete 



Cnicigenia 



rectosporum, Cosmarium 

 recurva, Mougeotia ... 

 Regnellii, Cosmarium 

 Regnesii, Cosmarium 

 regulare, Tetraedron 

 regularis, Glieocystis 

 regularium, Cosmarium 

 Reinhardtii, Navicula 

 Reinschiana, Tetrapedia 

 Reinschii, Cosmarium 



Staurastrum 



reniforme, Cosmarium 

 repens, Aphanochsete 



Herposteiron 



reticularis, Trochiscia 

 reticulatum, Hydrodictyon 

 Retzii, Phormidium... 

 reversa, Nitzschia ... 

 Rhaphidien?, Sub-Family 

 rhaphidioides, Cerasterias 



Dactylococcus... 



Rhaphidium, Gemis 

 Rhaphidonema, Genus 

 Rhizoclonium, Genus 

 Rhoicosphenia, Genus 

 rhomboides, Vanheurckia 

 rhynchocephala, Navicula 

 Richterianum, Chroothece 

 rivulare, OEdogonium 

 Rivularia, Genus 

 Rivulariaceae, Family 

 rlvulariarum, Lyngbya 

 rivularis, Aphanocapsa 



Hildenbrandtia 



Ilormiscia... 



Zonatrichia 



robusta, Eunolia 



Surirella 



robustum, Closterium 

 Roesiana, Melosira ... 

 rosea, Hildenbrandtia 

 roseo-persicinus, Clathrocystis 

 Rostafinskii, Cosmarium 

 rostratum, Closterium 



Euastrum 



rotata, Micrasterias ... 

 Rothii, CEdogonium 

 rotundatum, Cosmarium 

 Rotula, Cyclotella ... 



Pediastrum ... 



rotundum, Staurastrum 

 Roya, Genus 

 rufescens, Chroococcus 



Penium ... 



Trans. Y.N.U., 1901 (pub. July 1901). Bot. Series, Vol. 5. 



