288 



INDEX. 



muticum, Staurastrum, var. depres- 

 sum, IV 135 



- var. ellipticum, IV 134 



- var. minor, IV 135 



- var. subsphcricum, IV 138 



- var. typicum, IV 134 



Nsegeliana, Ursinella, III 14 

 Naegelianum, Cosmarium, III 14 



Didymidium, V 47 

 Nsegelii, Netrium, I 66 



Penium, I 66 

 nasuta, Ursinella, III 259 

 nasutum, Cosmarium, III 259 



- var. asperum, III 261 



- f. granulata, III 260 

 natator, Staurastrum, V 14-9 

 Nathorstii, Cosmarium, III 242 

 Navicula, Closteriura, V 262 



Penium, I 75, 110 ; V 261, 262 



- var. crassum, I 76 



- var. inflatum, I 77 

 var. Willei, I 76 



Navigium, Penium, I 64 

 neglecta, Hyalotheca, I 9 ; V 238 

 neglectum, Staurastrum, V 111, 139 

 nephroideum, Cosmarium, III Ki7 

 Netrium, I 24, 26, 63 ; V 261 

 Netzerianum, Cosmarium, III 159 

 nitens, Spondylosium, I 9 

 nitidula, Ursinella, II 197 

 nitidulum, Cosmarium. II 197 



- f. punctulata, II 197 



Euastrum (Cosmarium), f. gcn- 



uina, II 197 



nitidum, Staurastrum, V 47 

 iiobile, Docidium, I 196 



Pleurotsenium, I 196 

 nodosa, Docidiopsis, I 214 

 nodosum, Closterium, I 214 



Docidium, I 214 



- var. anglicum, I 215 



- var. dentatum, I 214 



- var. Hibernicum, I 214 



- var. typicum, I 214 



Pleurota?nium, I 14, 214 



- Staurastrum, V 88 

 nodulosum, Docidium, I 200 



- var. labiatum, I 202 



Pleurotsenium, I 200 



- var. ooronatum, I 199 

 Nordstedtiaiia, Ursinella, II 147 

 Nordstedianum, Cosmarium, II 146 



Onychonema, V 216, 218 

 Nordstedtii, Staurastrum, V 47 

 Norimbergense, Cosmarium, III 52 



- f. depressa, III 53 

 f. obliqua, III 51 



Norimbergense, Didymidium (Cos- 

 marium), III 52 



Norimbergensis, Ursinella, III 52 

 notabile, Cosmarium, III 15 



- f. media, III 17 



- f. minor, III 16 

 Didymidium (Cosmarium), III 



is' 



Dysphinctium, III 15 

 f. minor, III 17 



- subsp. speciosum, III 248 



Penium (Sphinctopenium), III 15 

 Notarisii, Staurastrum, V 55 

 Novse-Semlire Cosmarium, III 35 



- var. polonicum, III 39 



- var Sibiricum, III 36 



Ursinella, III 35 

 Nucleus, I 6 



Xymanniana, Ursinella, II 184 

 Nymannianum, Cosmarium II 184 



obcuneatum, Cosmarium, III 110 

 obesa, Cylindrocystis, I 60 ; V 260 



Helierella, II 29 

 obesum, Euastrum, II 29 

 obliqua, Ursinella, III 49 

 (tbliquum, Cosmarium, III 49 



- f. minima, III 51 



- var. trigonum, III 51 



- Nothocosmarium, III 49 

 oblonga, Echinella, II 12 



- Eutomia, II 12 

 oblongiforme, Euastrum, II 12 

 oblongum, Cosmarium, II 12 ; III 114 



Didymidium (Euastrum), II 13 

 Dysphinctium, III 114 

 Euastrum, II 12 



var. cephalophorum, II 14 



- var. depauperatum, II 15 



- f. genuinse, II 13 



var. integrum, II 15 



- var. oblongiforme, II 13 



- f. scrobiculata, II 14 

 Netrium, I 66 



- var. angustatum, V 261 



- var. brevius, V 261 



- var. cylindricum, I 67 

 Penium, I 66 



oblongus, Calocylindrus, III 114 

 obscura, Spirotaenia, I 44 

 obsoleta, Ursinella, II 133 

 obsoletum, Cosmarium, II 133 



- var. angustatum, II 135 



- f. galiciensis, II 135 



- var. Sitvense, II 134 

 Didymidium (Cosmarium), II 133 



obsoletus, Arthrodesmus, II 133 

 obtusa, Arthrodia, I 107 



