INDEX 



Ptilidium oiliare (L.) Nees 143 



Puccinellla airoides (Nutt.)Wats. 



& Coui.t 102 



Pyramidula tetragona (Brid.) 



Brid 113, 117 



Pyrenomycetes 332 



Pyrenopsis 205 



Pyrenula 179 



cinerella (Flt. ) Tuck. var. 



quadriloculata FlNK 236 



leucoplaca (Wallr.) Kbr. . 



187, 236 



leucoplaca ( Wallr. ) Kbr. 



var. pluriloculata Fink.. 236 



punctiformis (Ach.) Naeg. 



var. fallax Nyl 236 



thelena (Ach.) Tuck 236 



Pvrola secunda L 258, 259, 267 



Pviolaceae 267 



Pyxine 183 



sorediata Fr 182, 200 



Radula complanata (L.) Dumort. 144 



Ramalina 173, 178 



calicaris (L.) Fr. var. 



canaliculata Fr 192 



calicaris (L.) Fr. var. far- 



inacea Schaer 176, 192 



calicaris (L. ) Fr. var. 



fastigiata Fr 186, 192 



calicaris (L. ) Fr. var. 



fraxinea Fr 192 



polymorpha (Ach.) Tuck. 



176, 193 



pusilla (Prev. ) Tuck 



170, 179, 181, 192 



pusilla (Prev.) Tuck var. 



geniculata Tuck 170, 193 



Rammculaceo? 264 



Ranunculus hispidus Michx 265 



ovalis Raf 264 



recurvatus Poir 264 



Razoumofskya 271 



occidentalis (Engelm.) 



Kuntze 271 



tsugensis 272 



Rhamnaceae 266 



Rhizinia 309 



Rhi?.inacese 309 



Rhizobia 133, 135 



Rhodomela larix 149 



Rhodophycese 19 



Rhodymenia 293 



Ribes missouriensis Nutt 265 



Riccardia 141 



Rinodina 169, 187 



lecanorina Mass 175, 212 



oreina (Ach.) Mass... 175, 212 



sophodes (Ach.) Nyl.. 187, 212 



sophodes (Ach.) Nyl. var. 



exigua Fr 212 



sophodes (Ach.) Nyl. var. 



tephraspis Tuck 212 



Rivularia 75 



fluitans Cohn 52, 56 



Rosacea? 2 65 



Rubiaceae 268 



Rubus strigosus Michx 265 



Rurnex altissimus Wood. . . ; 264 



s 



Ragedia oxyspora (Nyl.) Tuck... 235 



Ka.lvinia natans (L.) Hoffm 255 



Salviniacea? 255 



Sanicula canadensis L 239 



pregaria Bicknell 239 



rnarylandica L 



trifoliata Bicknell 'i:;:\ 



Savasrana odorata (L.) Scribn.. ss 

 Scapania subalpina (Nees) Du- 

 mort 143 



undulata (L. ) Dumort.... 113 



Schedonnardus paniculatus(NuTT. ) 



Thelease 96 



Sehizothrix 75 



fasciculata Gomont 75, 77 



Scolochloa festucacea (Willd.) 



Link 101 



Sorophularia leporella Bicknell. . 268 



rnarylandica L 268 



Scrophulariacese 268 



Scytonema 77 



Selaginella rupestris (L. ) Spring. 246 



selaginoides (L.) Link.... 246 



Selaginellacese 246 



Selinttm cunndcnse Michx 242 



Senecio balsamitae Muhl 269 



Setaria glauca Beauv 87 



italica R. & S 87 



verticillata Beauv 87 



viridis Beauv 87 



Sibbaldiopsis tridentata (Soland.) 



Rydb 258, 259, 265 



Sieversia ciliata (Pursh. ) Rydb.. 265 



Silene noctiilora L 264 



Sisyrinchium campestre Bicknell 263 



Sitanion elymoides Raf 105 



Shim angustifolium L 241 



carsoni Durand 241 



cicutaefolium Gmelin 241 



lineare Michx 241 



Smilacea; 263 



Smilax ecirrhata (Engelm.) S. 



Wats 263 



Solonaceae 267 



Soranthera ulvoides 149 



Sorghastrum avenaceum (Michx.) 



Nash 84 



Spartina cynosuroides (L. ) Willd. 96 



gracilis Trin 96 



Spharonarftaemella helvellae Karst. 312 



Spatnularia 324 



clavata (Schaeff.) Sacc. 



315, 320, 321 



inflata 323 



Sphenolobus exsectus (Schmid. ) 



Steph 142 



exsecta;formis (Breidl. ) 



Steph 141, 14 2 



hellerianus (Nees) Steph.. 142 



michauxii (Web.) Steph.. 142 



Spirogyra 57, 59 



spongocladia 66 



Sporobolus asper (Michx.) Kunth. 92 



brcrifoliiis Scribn 92 



crvptandrus ( Torr. ) A. Gray 93 



cuspidatus (Torr.) Wood.. 92 



depauperatus Scribn 92 



ejuncidus Nash 93 



heterolepis A. Gray 93 



junceua (Michx.) Kunth.. 93 



neglectus Nash 92 



vagina?florus (Torr.) Wood 92 



Stapfia 72 



Stapfia cylindrica 71 



Staurothele 178 



umbrina (Wahl.) Tuck... 191 



umbrina (Wahl.) Tuck. 



var. clopima (Whlnb.) 



Nyl 253 



Sterpoeaulon 173 



paschale (L.) FR...171, 188, 214 



