Oct. i-Dec. 3i s 1917 
Illustrations 
VII 
Page 
Plate 25. Calvatia cyathiformis: A.—A ring showing stimulation of native 
plants inside the fruiting zone. B.—A trench through fruiting zone of C. 
cyathiformis . 246 
Plate 26. A.—A ring of Calvatia cyathiformis producing a second crop of puff¬ 
balls. B.—A large ring formed by Lepiota morganii, showing a second 
crop of fruiting bodies. 246 
Plate 27. A.—Three stages in the ripening of sporophores of Calvatia cyathi¬ 
formis. B.—Effect of a ring of C. cyathiformis on the density of the short- 
grass sod. C.—-Three fruiting bodies of Lepiota morganii in place in the 
fairy rings shown in Plate 2 2 B. 246 
Plate 28. A.—A small ring formed by Agaricus campestris , showing a total of 
29 mushrooms. B.— A large ring of Calvatia polygonia , showing 14 fruiting 
bodies. 246 
Plate 29. Calvatia polygonia: A.—Two fresh fruiting bodies, showing the 
character of the peridium at different stages. B.—An old fruiting body 
dried in place, showing the thick peridium scales. C .—A large fruiting 
body 30 cm. across, which for some reason has split open during the early 
growth period. 246 
Plate 30. A.—The effect of a ring of Agaricus tabularis on the native vegeta¬ 
tion. B.—A ring of Catastoma subterraneum. C.—A very small ring appar¬ 
ently caused by a fungus but marked only by a more luxuriant growth of 
Festuca ocioflora . 246 
Diagnosing White-Pine Blister-Rust From Its Mycelium 
Plate 31 Cronartium ribicola: A.—A tangential section, showing strands of 
hyphae among the white-pine host cells. B.—A haustorium showing the 
characteristic bend and irregular outline. 286 
Effect of Temperature Aeration and Humidity on Jonathan-Spot and 
Scald of Apples in Storage 
Plate 3 2. Apple-scald: Grimes apples, showing the effect of storing at 15 0 C... 318 
Plate 33. Apple-scald: A.—Grimes apples, showing the effect of storing at 
io° C. B.—Grimes apples, showing the effect of storing them at io° C. 
C.—An apple with part of its surface inclosed in a tumbler. 318 
Studies in Greenhouse Fumigation With Hydrocyanic Acid: Physiologi¬ 
cal Effects on the Plant 
Plate 34. A.—Tomato plants in the greenhouse at beginning of growth ex¬ 
periment. B.—Tomato plants when in fruit, showing the method of 
handling. 338 
Three-Lined Fig-Tree Borer 
Plate 35. Ptychodes trilineatus: Immature stages. A.—Egg. B, C.—Full- 
grown larva. D, E.—Pupa. 382 
PLATE 36. Ptychodes trilineatus: Adult. A.—Female. B.—Male. 382 
Plate 37. Ptychodes trilineatus: A.—Feeding injury of the larva. B.—Dead 
fig tree, showing injury by the three-lined fig-tree borer and other boring 
insects. 382 
