W. Wr.ST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE, 



Polycystis, Genus ... 



polydermatica, Gl(Teocapsa 



polygonum, Xanthidium 



polymazum, Cosmarium 



polymorphum, Penium 

 — ■ — Rhaphidium 121 

 Staurastrum ... 



polytricha, Aphanochaete 



polytrichum, Staura.strum 



Porphyridium, Genus 



Portianum, Cosmarium 



porticalis, SiDirogyra 



pi'Eelongum, Closterium 



prLT?morsum, Ccsmarium 



prserupta, Eunotia ... 



Prasiola, Genus 



princeps, QCdogonium 

 Oscillatoria 



Pringsheimii, Chastospheridium 



Qidogonium 



Staurastrum 



Pritchardianum, Closterium ■-• 



proboscidea, Epithemia 



proboscideum, Staurastrum ... 



]iroducta, Navicula ... 



productum, Staurastrum 



pronum, Closterium 



j^rostratum, Encyonema 



protensum, Stigeoclonium 



Protococcaces;, Sub-Family ... 



Protococcoidege, Order 



Protococcus, Genus... 



Protoderma, Genus... 



protogenita, Gloeotila 



protogenitus, Protococcus 



pruniforme, Nostoc ... 



pseudamoenum, Cosmarium ... 



pseudarctouni, Cosmarium 



Pseudoclosterium, Roya 



Pseudocijenobieae, Sub-Family 



pseudoconnatum, Cosmarium . . . 



Pseudodianae, Closterium 



pseudoexiguum, Cosmarium ... 



pseudofurcigerum, Staurastrum 



pseudonilidulum, Cosmarium 



pseudopyramidatum, Cosmarium 



Pseudoraphidiea;, Order 



Pseudoregnesii, Cosmarium ... 



Pseudosebaldi, .Staurastrum ... 



pseudotetracerum, Staurastrum 



pulchella, Draparnaudia 

 Synedra ... 



pulchellum, Dictyosphaerium ... 



Euastrum 



Spondylosium 



pulchrum, Coelastrum 



15s 



156 



67 



70 



46 



122 



105 



14 



99 



156 



72 



37 



54 



75 



194 



18 



17 



149 



22 



16 



99 



56 



192 



107 



179 



108 



56 

 162 



24 

 134 

 113 

 136 



25 



21 



136 



142 

 89 

 87 

 48 



118 

 87 

 49 

 91 



7S 

 190 



89 

 106 

 104 



24 

 196 

 130 



63 



95 

 115 



Pulvisculus, Chlamydomonas. . . 

 pimiilum, Cosmarium 

 punctata, Cyclotella... 



Merismopedia 



■ Nitzschia ... 



Orthosira .. 



punctato-striatum, CEdogonium 

 punctatum, Penium... 



Staurastrum 



punctulatum, Cosmarium 



Staurastrum 



Pupula, Navicula 

 purpurascens, Phormidium 

 purpureum, Mesotiienium 

 pusilla, Navicula 

 pusiilum, Closterium 

 pyramidatum, Cosmarium 



Spondylosium... 



Staurastrum 



pygma;a, Chantransia 



Kirchneriella 



Navicula ... 



Pinnularia ... 



Tolypothrix 



pygmpeum, Cosmarium 



— — Spondylosium 



Staurastrum 



quadrangulata, Mougeotia 

 quadrata, Crucigenia 

 quadratum, Cosmarium 



Staurospermum ... 



cjuadricauda, Scenedesmus 119 

 quadrifarium, Cosmarium 

 quadrum, Cosmarium 

 quaternarium, Cosmarium 

 quinarium, Cosmarium 

 quinina, Spirogyra ... 

 Rabenhorslii, Navicula 

 racemosa, Vaucheria 

 Raciborskii, Conferva 

 radians, Chodatella ... 



Synedra ... 197 



radicans, Ulothrix ... 

 radiatus, Coscinodiscus 

 radiosa, Navicula 

 Ralfsiana, Gloeocapsa 

 Ralfsii, A\-throdesmus 



Closterium ... 



Cosmarium ... 



Gonatozygon 



Sphaerozyga 



Zygnema 



Raphidiese, Order ... 

 recta, Micrasterias ... 



— • — Nitzschia 

 rectangulare, Cosmarium 



f>a.g;e 

 114 



95 

 219 



154 

 210 

 217 

 16 

 46 

 96 

 76 



lOI 



179 



146 



42 



175 



54 



78 



95 

 103 



13 



133 

 175 

 173 

 140 

 92 



95 

 102 



33 



118 



90 



33 

 120 



, 70 

 88 



75 

 76 



37 

 167 

 112 



26 

 123 

 199 



18 

 219 

 171 

 156 

 109 



57 

 68 



39 

 142 



34 

 15S 



67 

 215 



91 



