3i6 



Minnesota Algae 



polyspermum (Kuetz.) Wood (Do- 



lichospermum) 192 

 Polythrix Zanardini 252, 280 

 Porphyridium Naegeli 296 

 Porphyrosiphon Kuetzing S7, I33 

 prasina A. Br. (Aphanothece) 30, 32 

 prasina (Reinsch) Born, and Thuret 



(Dermocarpa) 52 

 princeps Vauch. (Oscillatoria) 58, 62, 



72 

 forma purpurea Collins 63 

 proboscidea Gom. (Oscillatoria) 58, 



64 

 prolifera Flah. (Calothrix) 254, 262 

 prolifica (Grev.) Gom. (Oscillatoria) 



S8, 61 

 pruniforme (Linn.) Ag. (Nostoc) 163, 



178 

 pulchra Kuetz. (Tolypothrix) 231 

 pulverea (Wood) De Toni (Microcys- 

 tis) 33. 35 

 pulvereus (Wood) Wolle (Anacystis) 



35 

 pulvereus Wood (Pleurococcus) 35 

 pulvinata (Mert.) Ag. (Calothrix) 



254, 260 

 pulvinata Kuetz. (Inactis) 146, 147 

 pulvinata Gom. (Schizothrix) 147 

 pulvinatum Nordst. (Scytonema) 221 

 pulvinatus Wolle (Microcoleus) 158 

 pulvinatus Breb. (Sirosiphon) 245, 249 

 forma alpinus (Kuetz.) Wolle 246 

 punctata Naeg. (Gloeocapsa) 14, 17 

 punctatum Wood (Nostoc) 163, 171 

 punctiforme (Kuetz.) Har. (Nostoc) 



161, 164 

 purpurascens (Kuetz.) Gom. (Phor- 



midium) 91, 95 

 purpurascens (Kuetz.) Gom. (Phor- 



midium) 139 

 purpurascens (Kuetz.) Gom. (Schizo- 

 thrix) 152 

 var. cruenta (Lesp.) Gom. 152 

 purpureus Snow (Chroococcus) 4, 10 

 pusilla Harv. (Lyngbya) iii, 128 

 putealis Mont. (Lyngbya) no, 125 

 var. minor Crouan 125 



quaternata (Breb.) Kuetz. (Gloeo- 

 capsa) 13, 17, 210 



quoyi (Ag.) Born, and Flah. (Bra- 

 chytrichia) 294 



quoyi (Ag.) Born. (Hormactis) 294 



racemosus Wolle (Synechococcus) 



II 

 radians Thur. (Rivularia) 288 



var. minutula Kirchn. 288 

 radiosa (Kuetz.) Kirchn. (Calothrix) 



235 



ralfsiana (Harv.) Kuetz: (Gloeocap- 

 sa) 15, 22 



ramosa (Thwaites) Gobi (Asterocy- 

 tis) 296 



ramosum (Thwaites) Hauck (Gonio- 



trichum) 296 

 ravenelii Wolle (Hydrocoleus) 134, 



138 

 ravenelii Wood (Scytonema) 220 

 ravenelii Wolle (Tolypothrix) 229, 



234 

 refractus Wood (Chroococcus) 4, 8 

 retzii Ag. (Lyngbya) 102 

 retzii (Ag.) Gom. (Phormidium) 92, 

 102 

 forma fasciculatum Gom. 103. 

 forma rupestris (Kuetz.) Gom. 103 

 rhizosoleniae Lemm. (Calothrix) 256, 



273 

 Richelia Jobs. Schm. 161, 201 

 richteriana Hansg. (Chroothece) 12 

 rigidissima Crouan (Leibleinia) 123 

 rivulare Kuetz. (Nostoc) 166 

 rivulare Kuetz. (Nostoc) 162, 167 

 rivulare Borzi (Scytonema) 211, 213 

 Rivularia (Roth) Agardh. 253, 283 

 Rivulariaceae 57, 252 

 rivulariarum Gom. (Lyngbya) 108, 



III 

 rivularis (Carm.) Rab. (Aphanocap- 



sa) 27, 28 

 rivularis (Kuetz.) Menegh. (Oncobyr- 



sa) 45 

 robusta Clark (Clathrocystis) 37, -38 

 robusta Setchell and Gardner (Micro- 



chaete) 202, 203 

 rosea -(Reinsch) Batters (Dermocar- 

 pa ?) 52, S3 

 rosea (Snow) Lemm. (Gomphosphae- 



ria) 38, 39 

 roseolum (Richter) Gom. (Plectone- 



ma) 206, 210 

 rubra Crouan (Lyngbya) in, 128 

 rubra Gom. (Schizothrix) 145 

 rubrapunctus Wolle (Chroococcus) 4, 



5 

 rubro-violacea Crouan (Lyngbya) in, 



128 

 forma crassior Crouan 119 

 rubrum Tild. (Phormidium) 91, 95 

 rubrum Mont. (Scytonema) 212, 228 

 rubrum (Menegh.) De Toni (Symplo- 



castrum) 144, 145 

 rufescens (Breb.) Naeg. (Chroococ- 

 cus) 248 

 rufescens Crouan (Lyngbya) 119, 125 

 rupestre Kuetz. (Nostoc) 176 

 rupestre Borzi (Sacconema) 281 

 rupestris Kuetz. (Gloeocapsa) 14, 19 

 rupestris (Lyngbye) Born. (Gloeo- 



thece) 25, 26 

 var. tepidar'iorum (A. Br.) Hansg. 



26 

 rupestris Wolle (Tolypothrix) 229, 



234 

 rupicola Collins (Dichothrix) 274, 279 

 rupicola Tilden (Schizothrix) 153 



