VI 
Journal of Agricultural Research 
Vol. XI 
Lire History or Macrosiphum illinoisensis, the Grapevine Aphis 
Page 
Pirate 8. Macrosiphum illinoisensis: A.—Antenna of male. B.—Antenna of 
fall migrant. C.—Colony on grape leaf. X).—Colony on grape leaf. 90 
Pirate 9. Macrosiphum illinoisensis; A,—Summer winged viviparous female, 
and details. B.—Summer wingless viviparous female, first instar. C.— 
Summer wingless viviparous female, fifth instar or adult. D.—Pupa of 
summer winged viviparous female. 90 
Fungus Fairy Rings in Eastern Colorado and Their Eeeect on Vege¬ 
tation 
Plate 10. Agaricus tabularis: A.—Three fruiting bodies about 10 to 15 cm. 
in diameter showing variation in the pileus. B.—Large, firm, fleshy fruit¬ 
ing bodies 10 to 15 cm. in diameter. C.—Three typical fruiting bodies. 
D.—Bottom view of fruits 7 to 15 cm. in diameter. 246 
Plate ii. Agaricus tabularis: A.—Sporophores developed in a dense stand 
of Agropyron smithii, which protected them from rapid drying. B.— 
Sporophore from the same ring as figure A, but freely exposed and showing 
the rough scaly top. C.—Typical of fruiting bodies exposed on dry hot 
days.. 246 
Plate 12. Agaricus tabularis : A, B.—Two fruiting bodies showing smooth 
and nearly smooth pileus. C, D.—Two fruiting bodies showing the rough 
or tabular structure of the pileus. 246 
Plate 13. Agaricus tabularis: A.—Two fruiting rings showing large fruiting 
bodies about 15 cm. in diameter and of relatively uniform size. B.—A 
ring just after the fruiting period. 246 
Plate 14. Agaricus tabularis; A.—A fruiting ring. B.—The mycelium as it 
appears on the soil mass. C.—A trench across a ring of A . tabularis in a Ku¬ 
banka wheat plot, showing the mycelium in the soil. 246 
Plate 15. Agaricus tabularis: A.—A trench across a fairy ring. B.—Another 
trench showing a different distribution of the mycelium in the soil. 246 
Plate 16. Agaricus tabularis: A.—General appearance of a fairy ring formed 
by A. tabularis during a dry year. B.—General view of a ring formed by 
A. tabularis; photographed during a dry year. 246 
Plate 17. Agaricus tabularis: A.—A trench through the ring shown in Plate 
16, A. B.—A trench through the ring shown in Plate 16, B. 246 
Plate 18. Agaricus tabularis: A ring which produced only a few mushrooms 
in 1915. 246 
Plate 19. Agaricus tabularis: A.—Part of a large ring, showing 42 mush¬ 
rooms. B.—A large ring, showing 75 fresh mushrooms. 246 
Plate 20. Agaricus tabularis: A ring caused by A . tabularis and distinguished 
by a uniform growth of Plantago purshii . 246 
Plate 21. Agaricus tabularis: A.—Effect of a ring on Kubanka wheat. B.— 
The stubble showing the distribution of the ring of A. tabularis . 246 
Plate 22. Agaricus tabularis: A.—A ring formed by A . tabularis in a field of 
Turkey wheat. B.—A trench across the ring shown in the figure above... 246 
Plate 23. A.—Method of measuring the penetration of water in three zones 
of a ring of Agaricus tabularis . B.—A ring of Agaricus arvensis showing the 
effect of irrigation during a dry year on the different zones. 246 
Plate 24. A.—A trench across the irrigated plot shown in Plate 19, B. B.— 
A ring of Calvatia cyathiformis photographed August 21, 1907, 16 miles 
north of Cheyenne Wells, Colo. 246 
