172 MISCELLANEOUS PUBLICATION NO. 725, U.S. DEPARTMENT OF AGRICULTURE 
Ophiostoma piceae, 390 
Opuntia--SEE Cholla 
Ornamental trees, diseases-- 
SEE UNDER Diseases 
Orr, Leslie .W., 2205 
Ozonium root rot, 1498, 1499 
Papreg, decay resistance, 1685 
Parker... D. Ean Fol 
Pathological anatomy 
blighted chestnut bark, 167 
Goniters, .( 255.1555. 1900 
Pathological effects, blazing 
trees, 2185 
Pathology 
and forest wildlife cover, 
1497 
and forestry in the Northeast, 
1848 
essential to silviculture, 113 
following chemotherapy, 
1629, 1632 
Pecky cypress, 1235, 2020 
Peniophora gigantea, effect on 
pine sapwood, 1586 
Peridermium 
galls, 1960 
Peridermium acicolum, 863, 
1518 
Peridermium appalachianum, 
new species, 963 
Peridermium apocynaceum, 
new species, 904 
Peridermium bethelii, new 
species, 907 
Peridermium carneum, 914 
Peridermium cerebroides, 548 
Peridermium cerebrum, 850, 
910, 1377, 1686 
Peridermium complanatum 
var. corticola, 1877 
Peridermium elephantopodis, 
new species, 904 
Peridermium filamentosum, 
9254851, 2208 
Peridermium floridanum, new 
species, 904 
Peridermium fructigenum, 
1786 
Peridermium fusiforme, 910 
Peridermium harknessii, 92, 
547,,.850, 899, 1368, 1369, 
ls 
Peridermium helianthi, 890 
Peridermium inconspicuum, 
new species, 1228 
Peridermium indicum, new 
species, 313 
Peridermium ipomoeae, new 
species, 891 
Peridermium kurilense, 313 
Peridermium montanum, 863, 
2207 
Peridermium ornamentale, 
2203 
Peridermium peckii, 1786 
Peridermium pyriforme, 908, 
ots 
Peridermium spp., 912, 1960 
Oltio, sae 
Peridermium stalactiforme, 
92, 906 
Peridermium terebinthinaceae, 
894 
Persimmon, common 
butt rot, 2204 
Polyporus spraguei, 2204 
stain during seasoning, 1662 
wilt, 69, \70L 75, no. S58. 
362, 363, 2301,. 569.9 SUE: 
Se 
fungus--SEE Cephalo- 
sporium diospyri 
Pestalotia blight, 2071 
Pestalotia funerea, 1770 
Pestalotia sp., 1004 
Pestalozzia--SEE Pestalotia 
Phacidium infestans, 2170 
Phacidium tsugae, new species, 
252 
Phaeocryptopus, 1459 
Phallus impudicus var. im- 
perialis, 1226 
Phallus rubicundus, 1226 
PH studies, fungus growth, 193 
Phellorina macrospora, 1266 
Phloem necrosis--SEE UNDER 
Elm 
Phoma abietina and Phomopsis 
pseudotsugae, 2232 
Phoma pitya and Phomopsis 
pseudotsugae, 2232 
Phomopsis blight--SEE UNDER 
Nursery diseases and names 
of hosts 
Phomopsis conorum, 688 
Phomopsis juniperovora, 411, 
681, 684, 685, 690, 709, 711, 
716 
new species, 680 
Phomopsis lokoyae, 149 
new species, 694 
Phomopsis occulta, 709 
