Bernardii, 276, also 272, 273; PI. 63 

 bijuga, 276, also 273; PI. 63 

 var. alternans, 277; PI. 63 

 var. flexuosus, 277 

 var. irregularis, 277 

 brasiliensis, 277, also 274; PL 63 

 denticulatus, 277, also 273; PL 63 



var. linearis, 277 

 dimorphus, 277, also 273; PL 63 

 hystrix, 278, also 273; PL 63 

 incrassatulus, 278, also 273; PL 63 



var. mononae, 278; PL 63 

 longus, 278, also 274; Pis. 63, 64 

 var. brevispina, 278 

 var. ellipticus, 278 

 var. minutus, 279 

 var. Naegelii, 279; Pis. 63, 64 

 obliquus, 279, also 273; PL 63 

 opoliensis, 279, also 274; PL 63 



var. contacta, 279; PL 63 

 perforatus, 279, also 274; PL 46 

 quadricauda, 280, also 274; PL 64 

 var. longispina, 280; PL 63 

 var. maximus, 280; PL 64 

 var. parvus, 280; PL 64 

 var. quadrispina, 280; PL 63 

 var. Westii, 281; PL 64 

 serratus, 281, also 273; PL 64 

 Schizochlamys, 90, also 87, 574 

 compacta, 90; PL 4 

 delicatula, 90 

 gelatinosa, 90; PL 4 

 Schizogoniales, 67 

 Schizomeridaceae, 104 

 Schizomeridineae, 104 

 Schizomeris, 104, also 581 



Leibleinii, 10.5; PL 7 

 Schizothrix, 506, also 479, 505, 593 

 fasciculata, 507 

 Friesii, 507, also 506; PL 114 

 fuscescens, 507, also 506; PL 114 

 lacustris, 507; PL 131 

 lardacea, 508, also 506 

 Muelleri, 508, also 506; PL 114 

 rivularis, 508, also 506; PL 114 

 tinctoria, 508, also 507; PL 131 

 vaginata, 509, also 507 

 Schroederia, 255, also 234, 578 

 Judayi, 256, also 255; PL 57 

 setigera, 256, also 255; PL 57 

 Scirpus, 548 



Scytonema, 533, also 595 

 alatum, 534; PL 123 

 Archangelii, 534; PL 123 

 cincinnatuin. See Scytonema crispum 

 coactile, 534; PL 124 

 crispum, 535, also 534; PL 124 

 figuratum. See Scytonema mirabile 

 mirabile, 535, also 533, 534; PL 124 

 var. tolypothricoides. See Scytonema 

 tolypothricoides 

 myochrous, 535, also 534; Pis. 124, 125 

 ocellatum, 25 



tolypothrichoides, 536, also 534; PL 123 

 Scytonemataceae, 532, also 478, 543 

 Seepage lakes. See Lakes 

 Selenastrum, 256, also 235, 575 

 Bibraianum, 256; PL 57 

 gracile, 257, also 256; PL 57 

 minutum, 257, also 256; PL 46 

 Westii, 257, also 256; PL 57 

 Silicon, 342, 370, 375, 385 

 Siphonales, 266, also 67 

 Sirogonium, 296 

 Snapping turtle, 47, 143 

 Sodium arsenite, 45 

 Soft water lakes. See Lakes 

 Soils, 5, 8, 11 



Sorastrum, 227, also 219, 577 

 americanum, 228; PL 50 



var. undulatum, 228; PL 50 

 spinulosum, 228; Pis. 50, 53 

 Spelaeopogon, 532 

 Sphaerella (See Haematococcus ) 



lacustris, 80; Pis. 2, 3 

 Sphaerellaceae, 80, also 68 

 Sphaerocystis, 83, also 82, 574 



Schroeteri, 83, also 88, 240; PL 3 

 Sphaeroplea, 111, also 110, 581 



annulina. 111; PL 12 

 Sphaeropleaceae, 111 

 Sphaeropleales, 110, also 66 

 Sphaerozosma, 359 



Spirogyra, 307, also 6, 7, 295, 296, 581, 583 

 aequinoctialis, 310, also 311; PL 72 

 affinis, 311, also 310 

 Borgeana, 311, also 310; PL 77 

 borysthenica, 311, also 308 

 eaten aeformis, 311, also 310 

 circumlineata, 312, also 309; PI. 74 

 Collinsii, 312, also 309; PL 77 

 communis, 312, also 309 

 condensata, 312, also 309; PL 72 

 crassa, 312, also 28, 48, 310, 314; PL 72 

 daedalea, 321 



daedaleoides, 313, also 309; PL 72 

 decimina, 313, also 28, 310 

 dubia, 313, also 310 

 ellipsospora, 313, also 310; PL 72 

 esthonica, 321 

 fallax, 314, also 308; PL 77 

 Farlowii, 314, also 308 

 flavescens, 314, also 309 

 floridana, 319 



fluviatilis, 314, also 310; PL 73 

 Fuellebornei, 315, also 310; PL 73 

 gracilis, 315, also 309 

 gratiana, 315, also 308; PL 74 

 Grevilleana, 315, also 308; PL 74 

 illinoisensis, 319 

 inconstans, 315, also 308 

 inflata, 316, also 308 

 Juergensii, 316, also 309; PL 73 

 jugalis, 316, also 310 

 laxa, 316, also 308 

 longata, 316, also 309 

 majuscula, 317, also 310; PL 74 

 maxima, 317, also 310, 314 

 micropunctata, 317, also 309; PL 73 

 mirabiUs, 317, also 309; PL 77 

 nitida, 318, also 310; PL 73 

 novae-angiiae, 318, also 310; PL 75 

 orientalis, 318, also 310 



porangabae, 318, also 309; PL 77 



porticalis, 318, also 309; PL 75 



pratensis, 319, also 309; PL 75 



protecta, 319, also 308 



pseudofloridana, 319, also 310; PL 75 



reflexa, 319, also 309 



rhizobrachialis, 320, also 310; PL 76 



rivularis, 320, also 310 



scrobiculata, 320, also 309; PL 76 



singularis, 320, also 309 



Spreeiana, 321, also 308; PL 77 



stictica, 321, also 310; PL 76 



subsalsa, 321, also 309; PL 73 



suecica, 321, also 309 



sulcata, 321, also 309 



tenuissima, 322, also 308 



Teodoresci, 322, also 310 



triplicata, 322, also 310 



varians, 322, also 310; PL 76 



Weberi, 322, also 308; PL 76 

 Spirulina, 479, also 478, 481, 591, 592 



laxa, 479; PL 108 



laxissima, 480, also 479; PL 107 



major, 480, also 479; PL 108 



Nordstedtii, 480, also 479; PL 108 



princeps, 480, also 479; PL 108 



subsalsa, 480, also 479; PL 108 



[975] 



