quadrata, 108, also 106 



stagnorum, 108, also 106; PI. 8 



tumidula, 108, also 106; PI. 8 



Willeana, 108, also 106; PI. 8 

 Microsporaceae, 106 

 Microsporales, 105, also 66 

 Microthamnion, 122, also 113, 584 



Kuetzingianum, 122; PI. 11 



strictissimum, 122; PI. 11 

 Mischococcaceae, 346 

 Mischococcus, 347, also 586, 588 



coiifervicola, 347; PI. 93 

 Monallantus, 352, also 348, 587 



brevicvlindrus, 352; PL 95 

 Mougeotia, 297, also 296, 297, 581, 584 



abnormis, 299, also 298; PI. 70 



americana, 300, also 299 



calcarea, 300, also 298, 299 

 var. bicalyptra, 300 



capucina, 200, also 299; PI. 70 



cyanea, 301, also 298 



eiegantula, 301, also 299; PI. 70 



floridana, 301, also 298 



genuflexa, 301, also 299; PI. 70 

 var. gracilis, 302 



gracilima, 302, also 299 



Hirnii, 302, also 298 



laetevirens, 302, also 298, 305; PI. 70 

 .laevis, 302, also 299: PI. 70 



maltae, 302, also 298 



micropora, 303, also 298; PI. 74 



notabilis. See Mougeotia abnormis 



nummuloides, 303, also 298 



parvula, 303, also 298 



pulchella, 303, also 299 



punctata, 303, also 299; PI. 71 



quadrangulata, 304, also 299; PI. 71 



recurva, 304, also 298 



Reinschii, 304, also 298 



robusta, 302, also 299; PI. 74 

 var. biornata, 304 



scalaris, 304, also 298; PI. 71 



sphaerocarpa, 305, also 298, 399; PI. 74 



tumidula, 305, also 299; PI. 71 



varians, 305, also 298; PI. 71 



ventricosa, 305, also 298 



virescens, 306, also 299; PI. 72 



viridis, 306, also 299; PI. 71 

 Mougeotiopsis, 306, also 295, 296, 581 



calospora, 306; PI. 69 

 Myriophyllum, 542 

 Myxophyceae, 443, also 2 

 Myzocytium, 295 



Nannoplankton, 3 

 Nemalionales, 564 

 Nephrocytium, 248, also 234, 575, 577 



Agardhianum, 248; PI. 54 



ecdysiscepanum, 248, also 249; PI. 54 



limneticum. 249, also 248; PI. 54 



lunatum, 249, also 248; PI. 54 



Naegeli. See Nephrocytium Agardhianum 



obesum, 249, also 248; PI. 54 

 Nitella, 331, also 3, 6, 13, 128, 184, 334, 

 585 



Batrachosperma, 332, also 333; PI. 78 



flexilis, 332; PI. 79 



opaca, 333, also 332; PI. 79 



tenuissima, 333, also 332; PL 80 

 Nitelleae, 331 

 Nitrates, 41 



Nitrogen, 16, 19, 21, 26, 27, 41, 42, 49 

 Nitrogen fixation, 41, 49 

 Nodularia, 527, also 510, 594 



Harveyana, 527 



spumigena, 527; PL 122 

 Nostoc, 520, also 236, 509, 510, 511, 539, 

 540, 594 



careruleum, 522, also 521; PL 119 



cameum, 522; PL 119 



coniminutum, 522; PL 119 

 commune, 523, also 521; PL 119 

 ellipsosporum, 523, also 521 

 Linckia, 523, also 521, 522; PL 119 

 microscopicum, 523, also 522; PL 120 

 muscorum, 524, also 521; PL 120 

 paludosum, 524, also 521; PL 121 

 pruniforme, 524, also 521, 525; PL 120 

 punctiforme, 525, also 521; PL 121 

 sphaericum, 525, also 521; PL 121 

 spongiaeforme, 525, also 522; PL 121 

 verrucosum, 526, also 521; PL 121 



Nostocaceae, 509, also 478 



Nostochopsaceae, 478 



Nostochopsis, 593 



Ochromonadaceae, 376 

 Ochromonadineae, 376, also 369 

 Oedocladium, 144, 145 

 Oedogoniaceae, 144 

 Oedogoniales, 144, also 67 

 Oedogonium, 156, also 28, 144, 145, 503, 

 554, 581 

 abbreviatum, 182, also 164; PL 36 

 Ackleyae, 201, also 159 

 acrosporum, 207, also 159; PL 41 

 var. bathmidosporum, 208; PL 41 

 var. boreale, 208 

 var. majusculum, 208; PL 41 

 Ahlstrandii, 189, also 165 

 ambiceps, 203, also 158; PL 37 

 americanum, 165, also 162; PL 43 

 amplum, 165, also 162 

 angustissimum, 176, also 149; PL ^4 

 angustum, 165, also 162; PL 29/ 

 anomalum, 166, also 161; PI. 2|9 

 areolatum, 166, also 162; PL 31 

 areoliferum, 176, also 159 

 Areschougii, 204, also 159 



var. contortofilum, 204; PL 40 

 argenteum, 166, also 162; PL 31 

 fa. michiganense, 166; PL 43 

 australe, 167, also 161, 175; PL 30 

 autumnale, 189, also 165; PL 34 

 bohemicum, 190, also 165; PL 37 

 Borisianum, 199, also 157; PL 35 

 Boscii, 167, also 163, 175; PL 30 

 brasiliense, 201, also 158; PL 41 

 Braunii, 197, also 158 

 calvum, 182, also 163; PL 37 

 capillare, 167, also 161; PL 43 

 capilliforme, 167, also 161; PL 44 



var. australe, 168; PL 29 

 cardiacum, 168, also 161; PL 29 

 carolinianiim, 177, also 160; PL 33 

 ciliatum, 204, also 159 

 concatenatum, 197, also 157 

 crassiusculum, 197, also 157 

 crassum, 168, also 161, 162, 166, 172; 



PL 44 

 crenulatocostatum, 168, 162; PL 30 

 var. cylindricum, 169; PL 30 

 fa. major, 169 

 crispum, 190, 165; PL 44 



fa. inflatum, 190 

 Croasdaleae, 204, also 159; PL 41 

 cryptoporum, 177, also 160 

 curtum, 177, also 160 

 cyathigerum, 195, also 158 

 fa. omatum, 195; PL 44 

 fa. perfectum. See Oedogonium 

 perfectum 

 decipiens, 205, also 159; PL 42 

 var. africanum, 205; PL 41 

 var. dissimile, 205, also 149; PL 42 

 depressum, 197, also 158 

 diversum, 169, also 162; PL 29 

 echinospermum, 199, also 158; PL 35 

 epiphyticum, 183, also 163; PL 36 

 exocostatum, 169, also 163; PL 30 



[971] 



