86 NORTH AMERICAN FLORA (VoLumE 10 
54, LEPTONIELLA Earle, Bull. N. Y. Bot. Gard. 5: 424. 1909. 
Agaricus § Leptonia Fries, Syst. Myc. 1: 201. 1821. : . 
Leptonia Quél, Champ. Jura Vosg. 88. 1872. Not Leptonium Griff. 1843. 
Pileus thin, fleshy, putrescent, usually squamulose and attractively colored, the margin 
at first incurved; lamellae adnexed or adnate; spores pink or salmon-colored, usually angular; 
stipe central, slender, tubular, with cartilaginous cortex; veil none. 
Type species, Lepionia anatina (Lasch) Quél. 
I, SPECIES OCCURRING IN TEMPERATE NorTH AMERICA, EXCEPT THOSE CONFINED TO THE 
PaciFic COAst 
Pileus white or whitish, often darker on the disk and sometimes becoming 
darker on drying. : . 
Pileus uniformly white or whitish, not blackening on drying. 
Pileus with a small rounded umbo. 1. L. albida, 
Pileus without an umbo. 2. L. albinella. 
Pileus white or whitish, darker on the disk. 
Lamellae denticulate and bluish- black on the edges. 3. L. subserrulata. 
Lamellae entire and pallid on the edges. 4, L. assularum. 
Pileus white, becoming blackish on drying. 5. L. transformate. 
Pileus rosy-isabelline, not striate. 6. L. acericola. 
Pileus yellowish-brown, conspicuously striate. 7. L. Whiteae, 
Pileus roseous with brown fibrils, darker on the disk. 8. L. rosea. 
Pileus uniformly rosy-brown, striate, 1 cm. broad. 9, L. roseibrunnea. 
Pileus violet-brown, darker on the disk, 12 mm. broad. 10. L. parva. 
Pileus bluish-green, fading to ashy-green with age. 11. L. aeruginosa. 
Pileus bluish-brown; lamellae bluish-brown and entire on the edges. 12. L. foliomarginata. 
Pileus bluish-black, often becoming grayish-brown with age; lamellae black 
and serrulate on the edges. 
Pileus grayish-brown, light-brown, or avellaneous. 
Stipe greenish-blue. 
Stipe murinous to plumbeous. 
Stipe grayish-brown or pallid. 
Pileus 4 cm. broad; stipe 8 cm. long. . 16. L. Earlei. 
Pileus 1-3 cm. broad; stipe scarcely reaching 6 cm. long. 
Pileus convex or plane, not umbilicate. 
Stipe 2-3 cm. long; species occurring on decayed wood. 
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13. L. columbaria. 
_ 
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. L. multicolor. 
. L. subplacida. 
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Surface of pileus glabrous. 17, L. glabra. 
Surface of pileus squamulose. 18. L. undulatella. 
Stipe 5 cm. long; species occurring on the ground. 19, L. alabamensis. 
Pileus umbilicate or depressed. 
Surface of pileus striate. 
Surface of pileus squamulose, distinctly long-striate. 20. L. longistriata. 
Surface of pileus glabrous, except on the disk, not distinctly 
long-striate. 21. L. grisea. 
Surface of pileus not striate. 
Pileus deeply umbilicate; stipe uniformly pallid. 22, L. umbilicata. 
Pileus subumbilicate; stipe pale-violet-gray above and 
white below. 23. L. validipes. 
Pileus dark-brown or blackish-brown, rarely reddish-brown; varying to 
yellowish-brown in L, strictipes. 
Stipe 1-4 cm. long. 
Stipe white. 24. L. abnormis. 
Sars Ageronmiabaglie pepe 25. L. hortensis. 
tipe mouse-gray, becoming blackish on drying. 26. L. cilipes. 
Stipe brownish or blackish. : Seer 
Pileus walnut-brown; species occurring on decayed wood. 27. L. seticeps. 
Pileus blackish-brown; species occurring in grass on lawns. 28. L. Davisiana. 
Stipe 5-8 cm. long. 
Pileus hemispheric; species occurring on decayed wood. 29. L. semiglobata. 
Pileus fiened umbilicate; species occurring in swamps or damp 
places, 
Lamellae and stipe pale-lemon-yellow. 30. L. 
Lamellae and stipe not as above. Sida tad 
Spores ellipsoid, 10-14 x 7-9 n. 31. L. strictipes. 
Spores globose, 7~10 yu. 32. L. subvilis. 
II. Species CONFINED TO THE PACIFIC coast 
Pileus dark-gray. 33. L. edulis 
Pileus lilac-black. 34. L. occidentalis 
Pileus fuliginous. 35. L. fuliginosa. 
Pileus black. 36. L. nigra. 
TI. Species coNFINED To TROPICAL NorTH AMERICA 
Species occurring on decayed wood. 
