764 



Haustoria, 48; of Erysiphaceaj, 155 



Hay bacillus, 36 



Heald, F. D., work of, 342 



Heart-rot of ash, 481, 483; of hemlock, 



517 

 Heat as factor in plant disease, 282 

 Helotiacese, characters of, 168 

 Helvellaceas, characters of, 170 

 Helvella crispa, 171; esculenta, fat con- 

 tent, 56 

 Helvelliineae, a suborder, 169 

 Hemibasidii, 178 

 Hemileia vastatrix, 503 

 Hemlock, 517 



Hemisyncotylous races, 329 

 Hemitery, 336 

 Hemitrichia vesparum, plasmodium of, 



12 

 Hepatica triloba attacked by Tranzs- 



chelia punctate, 348; figure of, 349 

 Hepburn's definition of enzyme, 56 

 Herbivores and spore distribution, 66 

 Heterodera radicicola, 391, 651 

 Heterogamy, 336 

 Heteromorphy, 336 

 Heteroplasia, 374, 375 

 Heteroplasm, correlation, 376 

 Heterotaxy, 336 

 Heterothallic moulds, 93 

 Hill, T. G., book of, 57 

 Histology emphasized, 271 

 Histology of callus, 379; of cataplasms, 



391; of fungi, 52; of galls, 396, 397 

 Histozyme, 58 

 Hollyhock, 517; rust, 203, 206, 517; 



figure of, 518 

 Homooplasia, 374, 375 

 Homothallic moulds, 93 

 Homotypy, 336 

 Horses, injury by, 310 

 Host list of oomycetous fungi, 115 

 Humphrey, C. T., mentioned, 75 

 Humus, influence on plants of, 281 

 Hydnaceae, characters of family, 223 

 Hydnocystis arenaria and black beetle, 



71 



Hydnoraceae, parasites of, 299 



Hydnum erinaceus, figure of, 224, 556 



Hydnum, species of, 223 



Hydrocyanic acid, 59 



Hymenium, 232 



Hymenogastraceae, character of family, 



240 

 Hymenomycetes, characters of, 219 

 Hyperchimaeras, 330 

 Hyperhydric tissues, 366 

 Hyperplasia, 355, 373 

 Hypertrophy, 337, 347, 354, 364 et seq.; 



kinds of, 364 

 Hyphas, 42 



Hyphomycetales, characters of, 266 

 Hypochnaceae, characters of, 220 

 Hypocreaceae, characters of, 160 

 Hypomyces, range of species of, 85; 



lactifluorum parasitic on Lactarius, 1 60 

 Hypoplasia, 354, 357; and cell contents, 



359, and tissue differentiation, 360; 



number of cells, 357; size of cells, 358 

 Hypothallus, 13 

 Hypoxylon, 164 

 Hysteriaceae, characters of, 165 



Ice action, 295 



Ice fringes, their formation, 283, 284 



Ice load of, figured, 285 



Ice storm and trees, 284, 285, 286 



Iceland moss on ground, 83 



Icterus, 343 



Idiotery, 337 



Illuminating gas, effect of, 291, 292 



Immunity, 272, 325; to plant disease, 

 274 



Impregnation of wood with preserva- 

 tives, 692 



Indol, 33 



Incubation, 312 



Incubator, copper, 612 



Infection by fungi, 307 



Infusions of plants, 600 



Injured tree, figure of, 309 



