CCXlviii PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



Phyllosticta tineola, 6 

 Phvtophthora omnivora, 374 

 Piggotia astroidea, 367 

 Pine branch twist, 38(3 

 .. cluster-cups, 385 

 „ leaf-cast, 389 

 Pink mould on Deutzia, 18 

 Plane leaf anthracnose, 365 



nerve anthracnose, 365 

 „ „ spot, 366 

 Plasmodiophora alni, 379 

 Podisoma foliicola, 22 

 Podosphoera oxyacanthae, 19 

 Polvpore on larch, 389 

 „ oak, 372 

 „ Scotch fir, 389 

 „ Weymouth pine, 389 

 Polyporus betulinus, 376 

 dryadeus, 372 

 ,, hispidus, 368 



Schweinitzii, 389 

 sulfureus, 370 

 Poplar leaf anthracnose, 380 

 „ blister, 382 

 „ spot, 380 

 „ mealy mildew, 385 

 ,, rust, black, 381 

 „ white, 381 

 „ sulphury wood-rot, 370 

 Portugal laurel, no pests in this country 

 on, 5 



Powdery mildew on hawthorn, 19 

 Privet cluster-cups in Germany, 6 



,, leaf-spot, 6 



., uredo in Germany, 6 

 Puccinia buxi, 7 

 ., coronata, 13 

 ,, rhododendri, 2 

 Purple spot on arbutus, 4 



,, ,, ,, berberry, 11 



„ willow-rust, 383 

 Pyrus aria, cluster-cups on, 22 



Quince, cluster-cups on. 22 



Ragwort, disease of, 386 

 Rhabdo.spora oleandri, 3 



salicella, 383 

 Rhizinia undulata, 389 

 Rliizomorpha in tree-root rot, 379 

 Rhododendron brand, 2 



„ bristle-spore, 3 



„ galls, 1 



„ leaf-spots, 2 



„ rust, 2 



Rhus leaf-spots not in Britain, 21 

 Rhytismft acerinum, 363, 364 

 „ punctatum, 364 

 „ salicinum, 384 

 Roestelia cancellata, 21 

 ,, coi nuta, 21 



lacerata, 20, 23 

 Rcot-rot, conifer, 387 

 tree, 379 

 white, 365, 370 

 Rosellinia ligniaria, 369 

 „ necatrix, 365 



Rosellinia quercina, 370 

 Rot, heartwood, 368 

 „ -mould on beech seedlings, 374 

 ,, polypore, 389 

 „ root-, 365, 370, 379, 387 

 „ wood-, 370, 372 

 Rowan tree cluster-cups, 21 

 Rust, aspen, 381 

 „ birch-leaf, 376 

 „ black poplar, 382 

 „ box, 7 



crack willow, 383 

 ,, goat willow, 384 

 „ larch, 390 

 ., oak-leaf, 370 

 „ osier, 383 

 ,, phillyrea, 9 

 ,, purple willow, 383 

 ,, rhododendron, 2 

 ,, white poplar, 381 

 „ jelly-, 21, 22' 

 Sarcostroma Berkeleyi, 22 

 Savin jelly-rust, 21, 22 



„ ieaf-dot, 22 

 Scab on elm-leaf, 367 

 Schinzia alni, 379 

 Sclerotinia Douglassii, 383 

 Scotch fir, polypore on, 389 

 Septoglceum acerinum, 362 



,, Hartigianum, 3G2 

 Septoria aceris, 361, 362 

 „ alni, 378 

 „ alnicola, 378 

 ,, alnigena, 378 

 ,, arbuti, 4 

 ,, berberidis, 10 

 ,, calycanthi, 17 

 ,, cornicola, 15 

 ,, fraxini, 368 



garryae, 18 

 ,, hederaB, 8 

 ,, hippocastani, 366 



insularis, 8 

 „ ligustri, 6 

 ,, neriicola, 3 

 ,, oleandri, 3 

 „ oleandri na, 3 

 ,, parasitica, 388 

 ,, phyllostictoides, 19 



populi, 380 

 ,, rhododendri, 2 

 ,, salicella, 383 

 „ salicicola, 382 

 ,, solitaria, 2 

 ,, staphyleae, 18 



tiliae, 378 

 ,, ulmi, 366 

 ,, unedonis, 4 

 Shrubbery, Fungoid Pests of the, 1 

 Sida leaf-spot, 17 

 Silver fir cluster-cups, 386 



,, ,, hypoderma or redness, 388 



„ nectria, 387 

 ,, ,, phoma, 385 

 ,, ,, seedling disease, 385 

 „ „ woolly Sphaeria, 387 

 ' Silver leaf,' attributed to Stereum pur- 



pureum, 366 

 Sooty mould on birch, 378 



