Plagiothecium piliferum 40 



" silvaticum 40 



" striatellum 96 



" sylvaticum 96 



" turfaceum 96 



Platygyrium repens 96 



Pleuridium Bolanderi 94 



Pleuroziopsis ruthenica 40 



Pogonatum contortum 40 



" urnigerum 40 



Pohlia nutans : .95, 96 



Polyblastia intercedens 82 



Polytrichum alpinum 40 



" commune 40, 100 



" formosum 40 



" gracile 40 



" juniperinum 40 



" piliferum 40, 94 



Porella dentata 89 



" pinnata 89 



" platyphylla 89 



" rivularis 89 



" Sullivantii 89 



" Thuja 88,89 



Porotrichum alopecurum 32 



Porothamnium Bigelovii 52 



" ? neomexicanum . 52 



Pottia intermedia 40 



Pressia commutata . 90 



" quadrata 1 1, 90 



Pseudoleskea 43 



Pseudotsuga taxifolia 86 



Pterigynandrum filiforme 40 



Pterogonium gracile 40, 94 



Ptilidium ciliare 89 



" crista-castrensis 40 



" pulcherrimum 89 



Ptychocoleus polycarpus 63 



" torulosus 62, 63 



Pylaisia intricata 40 



" polyantha 40 



Radula 62 



Raphidostegium carolinianum ... 96 

 " " admix- 



tum. 96 



" demissum 41 



" marylandicum . . 96 



Reboulia hemisphaerica 90 



Rectolejeunea Brittoniae n. sp 92 



Rhabdoweisia fugax 41, 96 



Rhacomitrium aciculare 41 



" canescens 4i» 67 



" fasciculare 41 



" heterostichum .... 41 



" lanuginosum 41 



" patens 41 



" sudeticum 41 



" varium 41 



Rhodobryum roseum 41 



Rhytidiadelphus squarrosus 41 



" triquetrus 41 



Rhytidium rugosum 41 



Riccardia 34 



" latifrons 90 



" multifida 90 



" pinguis 90 



" sinuata 90 



Riccia Austini 90 



" crystallina 90 



Riccia fluitans 91 



" " V. Sullivantii 91 



" lamellosa 90 



" lutescens 91 



" natans 91 



" tenuis 91 



Ricciella crystallina 90 



" fluitans 91 



" membranacea 91 



" Sullivantii 91 



Ricciocarpus natans 91 



Saelania glaucescens 41 



Scapania dentata 89 



" exsecta 56, 89 



" Oakesii 89 



" portoricensis 58 



Schizopelte californica 47 



Scleropodium apocladum 94 



" illecebrum 94 



" obtusifolium 94 



purum 41 



Scytonema 84, 85 



Southbya 34 



Sphaerocarpus terrestris 91 



" texanus 91 



Sphagna 37 



Sphagnum 2,3,44,45,65 



acutifolium 41, 44 



" afline 6 



" alegrense 9 



" Bartlettii 9 



brevicaule 66 



centrale 70, 71 , 72 



" compactum 70 



" cubense 66 



cuspidatum 41 



cyclophyllum 73 



" cymbifolium, 



7, 41, 64, 66, 72 

 " ludovicianum, 64 



degenerans 6 



" Earlei 66 



" erythrocalyx, 



64,65,66,70,73,74 



fimbriatum 41 



fuscum 41 



" Girgensohnii 41. 96 



" guadelupense 65, 66 



Guyoni 65 



Harperi 66 



" Henryense 8, 9, 74 



Bartlettii. 9 



" Huntii 66 



" Husnoti 65 



imbricatum 2, 3, 4, 6, 

 7, 9> 41. 

 70, 73. 74 

 afline, 7, 8, 96 



intermedium 71, 72 



ludovicianum 64 



magellanicum, 70, 71, 



72, 73, 74, 96 



medium 65, 70, 72 



" papillosum . . 65 

 meridense versicolor . . 70 



molle 41 



molluscum 41 



palustre, 6, 7, 8, 9, 63, 



64, 71, 72, 73, 74 



