Part 6, 1916] AGARICACEAE 397 
Context with bitter taste. 27. C. fellea. 
Context without bitter taste. 
Stipe equal. 28. C. flavidella. 
Stipe subbulbous. 29. C. subbulbipes. 
Pileus 2.5—7 em. broad. 
Surface glabrous. 30. C. pulcherrima. 
Surface hairy-tomentose. 31. C. subhirta. 
Pileus 7-12 em. broad. 32. C. nobilis, 
Hymenophore densely cespitose. 
Pileus 7 cm. or less broad. 
Spores ellipsoid; pileus thin. 33. C. multiformis. 
Spores globose; pileus thick. 34. C. multiceps. 
Pileus 12 em. broad. 35. C. elephantina. 
Pileus brownish when moist, becoming whitish or yellowish on drying. 
Pileus 4-10 mm. broad. 36. C. peltigerina. 
Pileus 1-2.5 cm. broad. 37. C. subditopoda. 
Pileus 2.5—5 cm. broad. 
Pileus squamulose. 38. C. subsquamaia. 
Pileus glabrous. 
Stipe 4-8 mm. thick; lamellae becoming cinereous. 39. C. dicolor. 
Stipe 2-4 mm. thick; lamellae not becoming cinereous. 40. C. hiemalis. 
Pileus green or greenish, fading with age or on drying. 41. C. virens. 
Pileus some shade of red or reddish-brown. ; 
Pileus pale-rosy-isabelline, often pale-bay on the disk; stipe 1-2 cm. 
thick. 42. C. subclavipes. 
Pileus reddish-flesh-colored; lamellae reddish. 43. C. trullisata. 
Pileus ochraceous-red; lamellae becoming yellowish. 44, C. sinopica. 
Pileus brick-colored to tan-colored; lamellae becoming reddish. 45. C. inversa. 
Pileus brownish or reddish-brown; lamellae pallid or subcinereous. 46. C. subconcava. 
Pileus reddish, brownish, or pale-tan-colored; lamellae white, un- 
changing. 
Pileus 2-3 em. broad. 
Species growing in grassy places. 47. C. compressipes. 
Species growing under pine trees. 48. C. pinophila,. 
Pileus 4-7 cm. broad. 49. C. infundibuliformis. 
Pileus some shade of gray, grayish-brown, or blackish-brown. 
Pileus 2-5 em. broad. 
Pileus gray or light-brown. 
Species growing in grassy places. 50. C. vilescens. 
Species growing in humus in woods. 51. C. lactariiformis. 
Pileus dark-brown. 52. C. concava. 
Pileus 5-10 cm. or more broad. 
Stipe short, rarely reaching 7 cm. . 
Stipe white. 53. C. fumosa. 
Stipe brown or blackish. 
Stipe equal. 54. C. media. 
Stipe much thickened at the base. 55. C. clavipes. 
Stipe long, 10-15 cm. 
Pileus avellaneous. 56. C. coloradensis. 
Pileus dark-brown. 57. C. Earlei. 
II. SPECIES OCCURRING ON THE PACIFIC COAST 
Pileus white, whitish, or slightly yellowish. : 
Pileus 0.5-1.5 cm. broad. 58. C. pusilla. 
Pileus 2-4 cm. broad, sometimes larger in C. microspora. 
Species growing in grassy places. 1. C. dealbata. 
Species growing in the woods. : 
Pileus umbonate, the umbo avellaneous. 59. C. subfumosipes. 
Pileus not umbonate, depressed at the center. 
Stipe 2-4 em. long. . 
Spores globose. 60. C. microspora. 
Spores ellipsoid. 5. C. candens. 
Stipe 4-6 cm. long. 61. C. subdicolor. 
Pileus 5-10 em. broad. 
Stipe 3-6 cm. long. . . : 
Lamellae distant; stipe equal. 62. C. washingtonensis. 
Lamellae more or less crowded; stipe thickened at the base. 63. C. variabilis, 
Stipe 10-15 cm. long. ae 
Pileus gregarious; stipe 15 em. or more long. 64. C. stipitate. 
= Pileus cespitose; stipe 9-16 cm. long. 65. C. albiformis. 
Pileus stramineous. Fl 
Pileus convex to plane. 66. C. subcandicans. 
,, Pileus umbilicate to depressed. 67. C. Peckii. 
Pileus isabelline. : 
Pileus umbilicate to infundibuliform. 68. C. oregonensis. 
Pileus convex to plane, sometimes slightly depressed. ; 
Lamellae white, not changing. 69. C. rugosipes. 
Lamellae rosy-isabelline, becoming darker. 70. C. vialis. 
