SUBJECT INDEX 



Plat anus, 43, 117, 121, 212 



Plcnozytliia, 126, 139 



Pleospora herbaruin, 208 



Pleurococcus, 109, 140, 149 



Pint ens cervinus, 17 



Poa, pollination of, 42 



Point source, 47, 48, 51, 169, 177 



Polar air, the spora of, 128, 129, 140, 141 



Pollen, comparison of traps for, loi 



— densities of, 16 



— discovery of function of, 2 



— grains, PI. 7; see also genera and species 

 involved 



— in marine air, 214 



— in rain, 149, 151, 152 



— in upper air, 134-47, I53, I54 



— output, 31 



— transport by wind, 2 



— vertical gradients of, 131-3, 146 

 Pollination mechanisms, 39-43 

 Polyhedral viruses in air, 33 

 Polyporus conchatus, 36 



— squamosus, 17, 21 

 Polylrichum, 15, 16 



Polythrincium trifolii, 116, 118, 120, 208 



Populiis, 43, 127, 180 



Portable volumetric spore-trap, loi, 102 



Potamogeton, pollination of, 42 



Potato, late-blight of, see Phytophthora infest am 



— leaves, spore deposition on, 74, 75 

 Poterium, poUination of, 43 

 Prasiola stipitata, 150 

 Precipitation water, microbes in, 148-59 

 Pre-impinger, 98, PI. 4 

 Presentation of spores, 34 



Probable flight concept, 168 

 Proteus vulgaris, 153 

 Protozoa in air, 9, 13, 108, 109 



— in rain-water, 148, 149 

 Prunus armeniaca, 166 

 ^Psalliota campestris', 17, 82, 84, 85 

 Psathyrella hydrophila, 210 

 Pseudomonas, 143 

 Pseudoperonospora cuhensis, 95 

 Psilocyhe, 120, 210 



Pteridiuin, no, 210 



Pteridophyte sling dispersal mechanism, 39 

 • — spores in air, no, 146, 182, 184 

 Pteridophytes, spores of, PL 6; see also genera 



and species involved 

 Public buildings, air-spora, of 158-60 

 Puccinia, 135 



— antirrhini, 165, 189 



— coronata, 17 



— coronifera, 17, 35 



— glumarum, 134, 137, 141, 191 



— graminis, 16-18, 31, 82, 85, 134, 141, 152, 

 165, 178, 187, 188, 191, 210 



— helianthi, 203 



— malvacearum, 189 



■ — polysora, 116, 165, 189, 191, 200 



— pringsheimia, 35 



— riibigo-vera, 191 



— sorghi, 185 



— triticina, 35, 134, 135, 188, 199 

 Puffballs, spore output of, 31 

 Puffing of discomycetes, 37 



Pullularia, 116, 120, 123, 141, 142, 145 

 Pyronema conjlucns, 208 

 Pylaisia polyantba, 150, 151 

 Pyrenomycete type of spore liberation, 37 



Quantity liberated, Q_o, 47, 167-70 

 Quarantines, 182, 198-200 

 Qiiebec Province, 143-7 

 Qjiercus, 16, 43, 117, 127, 212 



Radioactive Lycopodium spores, experiments 

 with, 78, 88 



— wash-out, 88 



Rain deposition, 148-52 



— effect on air-spora, 122, 123 



washing, 10, 85-89, 122, 148-54 



Raindrops, efficiencv as spore collectors, etc., 



85-88, Figs. 15,16 

 Rain-splash dispersal, 35-36, 194 

 Random deposition of spores, 164 



— distribution of microbes in air, 20, 45 

 Re-concentration of spores within clouds, 154, 



197 

 Regression equations for gradients, 169 

 Resolute Bay, Canada, 142 

 Retention errors in samphng, 96 



— of spores on surfaces, 73-75 

 Reticularia, 33, 210 

 Reynolds number, 26 



Rhine Valley, dispersal of maize rust in, 185 



Rhizopus in stratosphere, 135 



Rhododendron, pollination of, 42 



Ringworm, 6 



Rosellinia aquila, 208 



Rotating cylinders, deposition on, 61, 63, 64 



Rothamsted Experimental Station, sampling 



at, 106, 114-23, 151, 152 

 Rotorod sampler, 103 

 Rough surfaces of ground, etc., 25, 26 



— surfaces of pollen and spores, 19 

 Rounding-off dispersal mechanisms, 37 

 Roy a, 150 



Rumex, 43, 117, 127, 212 

 Russia, migration of rusts in, 188 

 Russula emetica, 17 

 • — nigricans, 210 



— vesca, 210 



Rust fungi, dispersal of, 185, 187; sec also 

 the species involved 



— fungi, vertical gradients of, 137 



St. Petersburg, 153 



Salix, 43, 127, 130, 212 



Salsola pestifer, 16, 43 



Salt-water media for bacteria, 125-7 



Samphng errors in trapping, 95, 96 



— techniques, choice of, 90 

 Sangiiisorha, pollination of, 43 

 Sarcina, 136, 140, 143, 145 



— flava, 126 



• — lutea, resistance to ultra-violet radiation, 



192 

 Schizophyllum commune, 190 

 Scilly Isles, 127 



243 



