,;_._, THE AGARICACEAE OF MICHIGAN 



civolvata Pk. has a brilliant orange pileus shading to whitish 

 on the margin; it has been found from New Jersey to North Caro- 

 lina. (See colored plate, Marshall, Mushroom Book, Frontispiece, 

 1905. i 



Key to the Species 



(A) Volva membranous, cup-shaped or sheathing the base of the stem, 

 (a) Pileus small, 2-3 cm. broad, pale brown; stem bulbous, slender; 



spores elliptical, 5-6 x 4 micr. A. pusilla Pk. 

 (aa) Pileus larger; spores 8 micr. or more in the longest diameter, 

 (b) Gills adnate; pileus even on the margin, yellowish-buff; volva 



close-fitting, white. A. adnata Smith, 

 (bb) Gills free; pileus more or less striate on margin. 



(c) Pileus hairy-squammulose; volva large, firm, cup-shaped. 661. 



A. volvata Pk. 

 (cc) Pileus glabrous except for occasional patches of the univer- 

 sal veil; volva sheathing, flabby, 

 (d) White. 662. A. vaginata Fr. var. alba Sacc. 

 (dd) Tawny-yellowish. 662. A. vaginata Fr. var. fulva Sacc. 

 (ddd) Gray to mouse-colored. 662. A. vaginata Fr. var. livida 

 Pk. 

 (AA) Volva friable, floccose, etc., not membranous, 

 (a) Pileus orange to yellow, plicate-striate on margin; stem and gills 



pale yellow; volva thin and evanescent. A. parcivolvata Pk. 

 (aa) Pileus some other color, 

 (b) Pileus small, 2-3 cm. broad, pulverulent, striate, grayish to 



mouse-colored. A. farinosa Schw. 

 (bb) Pileus larger, with floccose patches or warts on its sur- 

 face, 

 (c) Pileus white to pale yellowish, finely striate on the margin; 

 volva ocreate, as in Amanita pantherina. A. albocreata Atk. 

 (cc) Pileus grayish-brown, sulcate striate, covered with mouse- 

 colored warts; volva breaking up into sub-annular fragments 

 on stem. 663. A. strangulata Fr. 



Section I. Universal veil membranous, splitting at the apex; 

 the volva vagina te or cup-shaped at the base of the stem, entire. 



661. Amanitoposis volvata Pk. (Poisonous) 

 X. Y. State Mus. Kep. 24, 1872. 

 Illustrations: Murrill, Mycologia, Vol. 5, Pis. SG and 87, Fig. 2. 



PILEUS 5-7 cm. broad, convex then plane, even or slightly 

 striate on margin, covered with fibrillose or floccose scales, whitish 

 to brownish. (ilLUS free, close, white. STEM 5-10 cm. long. 5-10 

 mm. thick, white to brownish-gray, equal or tapering slightly up- 

 ward, stuffed, densely pulverulent-floccose or shaggy above the 

 volva. with a very large, persistent, membranous, firm, brown volva 

 sheathing the base. SPORES elliptic-oblong, 9-11x13-7 micr., 

 smooth, white, granular within. 



