298 . NORTH AMERICAN FLORA [VoLuME 9 
Spores hyaline, rarely tinged with brown. 
Pileus viscid. 47. LIMACELLA. 
Pileus dry. 48. Leprora. 
Spores green when fresh, brown in herbarium speci- 
mens. 49. CHLOROPHYLLUM, 
Volva present, veil absent. 50. VAGINATA, 
Volva and veil both present. 51. VENENARiUS. 
28. GEOPETALUM Pat. Hymén. Eur. 127. 1887. 
Phyllotus P. Karst. Bidr. Finl. Nat. Folk 32: 92. 1879. Not Phyllota Benth. 1837. 
Pileus fleshy or membranous, not reviving, without a distinct stipe, sessile or contracted 
into a stipe-like base, often resupinate when young: lamellae usually radiating from a lateral 
or eccentric point: spores hyaline: veil none. 
Type species, Geopetalum petaloides (Bull.) Pat. 
Species occurring in temperate North America, 
Pileus 0,5-1.5 em. broad. 
Pileus rufous, reniform, 12 mm. broad. 
Pileus white. 
Q 
. Blakei. 
Spores globose, 4-5.5 uw; surface shining-white. 2. G. candidissimum. 
Spores ellipsoid. 
Spores less than 7 u long. ; 
Species confined to the eastern United States. 3. G. semicaptum. 
Species confined to the Pacific coast. 4, G. oregonense. 
Spores more than 7 p long. 
Species growing on sotl; spores 9-11 K 4-5 yu 5. G. geophilum. 
Species not growing on soil; spores 7-9 X 2-4 pn. 6. G. septicum. 
Pileus 2 cm. or moce broad. 
Lamellae not crowded. 
Pileus 2~3 em. broad; surface glabrous. 7. G. albescens. 
Pileus 5-7 cm. broad; surface slightly tomentose. 8. G. alliaceum. 
Lamellae crowded. 
Spores globose or subglobose. 
Pileus at first resupinate; spores 4-7.5 p. 9, G. abietinum. 
Pileus not at first resupinate; spores 2-4 p. 10. G. angustatum. 
Spores ellipsoid or ovoid. 
Pileus 4-9 cm. broad; species growing on the ground. ll. G. petaloides. 
+ Pileus 2-5 em. broad; species growing on dead wood. 
Pileus white, 2 cm. broad. 12. G. densifolium. 
Pileus grayish-brown, 5 cm. broad. 13. G. betulinum. 
Species occurring in tropical North Ametica. 
Pileus less than 1 cm. broad, rarely exceeding this size in G. copulaium, 
Pileus resupinate. 
Pileus 1-2 mm. broad. 14. G. inconspicuum. 
Pileus 3-8 mm. broad. 15. G. subelatinum. 
Pileus not normally resupinate. 
Surface white or pale-yellowish. 
Surface white; lameilae whitish-pruinose on the edges. 16. G. haedinum. 
Surface pale-ochraceous; lamellae not whitish-pruinose on 
the edges. 17. G. copulatum. 
. Surface ferruginous. 18. G. iremelliforme. 
Pileus more than 1 em. broad. 
Surface white. 
Surface translucent, glabrous; pileus reniform. 19. G. catephes. 
Surface milk-white, pubescent; pileus flabelliform. 20. G. subhaedinum. 
Surface white to pale-fuscous, spongy-pubescent to glabrous; pileus 
flabelliform or spatulate. 21. G. semitectum. 
Surface fuscous, spongy-tomentose; lamellae flavous. 22. G. flavolanatum. 
1. Geopetalum Blakei (Berk. & Curt.) Murrill. 
Agaricus (Pleurotus) Blakei Berk. & Curt. Ann. Mag. Nat. Hist. III. 4: 288. 1859. 
Pleurotus Blakei Sacc. Syll. Fung. 5: 368. 1887. 
Pileus reniform, conchate, 12 mm. broad; surface glabrous, puberulent behind, rufous: 
lamellae interveined, distant, broad, ventricose, thin, subconcolorous, paler: stipe wanting. 
TYPE LOCALITY: Maine. 
Hasirat: On dead Abies. 
DistRIButTION: Known only from the type locality. 
2. Geopetalum candidissimum (Berk. & Curt.) Murrill. 
Agaricus (Pleurotus) candidissimus Berk. & Curt. Ann. Mag. Nat. Hi 
Pleurotus candidissimus Sacc. Syll. Fung. 5: 368. 1887. ee cere Negeee Meee 
Pileus delicate, affixed by a few hairs, sessile, reniform or dimidiate, reaching 1.5 cm. 
