Family 7. AGARICACEAE* 



By William Alphonso Murrxll 



LACCARIA 



Berk. & Br. Ann. Mag. Nat. Hist. V. 12: 370. 1883. 



Russuliofisis Schrot. Krypt. Fl. Schles. 3 1 : 622. 1889. 



Pileus fleshy, putrescent, thin, hygrophanous, solitary or gregarious; lamellae broadly 

 adnate, thick, conspicuously whitened by the spores; spores hyaline, globose, verruculose or 

 echinulate; stipe central, fleshy or fibrous; veil none. 



Type species, Agaricus laccatus Scop. 



Pileus 1—5 cm. broad. 



Lamellae violaceous. g 1. L. amethystea. 



Lamellae incarnate or pallid. 



Pileus 0.5-1 cm. broad, irregular; spores echinulate, 12-16 /z. 2. L. tortilis. 

 Pileus 1.2—5 cm. broad, regular; spores verruculose, 8-13 ju. 



Pileus 2 cm. or less broad, striatulate, spores 11-13 /*. 3. L, striatula. 



Pileus usually larger, smooth; spores 8-10 fi. 4. L. laccata. 



Pileus 5-10 cm. broad. 5. L. ochropurpurea. 



1. Laccaria amethystea (Bull.) Murrill. 



Agaricus amethystinus Bolt. Hist. Fung. Halifax 41. 1788. Not A. amethystinus Scop. 1772. 



Agaricus amethysteus Bull. Herb. Fr. pi. 198. 1784. 



Pileus thin, broadly convex, umbilicate or centrally depressed, solitary or gregarious, 

 1.2-2.5 cm. broad; surface hygrophanous, brown or violaceous-brown when moist, grayish 

 when dry, unpolished; lamellae subdistant, adnate or decurrent, violaceous, color more per- 

 sistent than in the pileus; spores globose, verruculose, 8-10 n; stipe slender, equal, flexuous, 

 hollow, concolorous or paler, 2.5-5 cm. long, 2-4 mm. thick. 



Type locality: France. 

 Habitat: Damp ground in shaded places. 



Distribution: Eastern temperate North America; also in Europe. 



Ii,i,ustrations: Sow. Engl. Fungi pi. 187; Bull. Herb. Fr. pi. 198, pi. 570, f. 1 G; Ann. Rep. 

 N. Y. State Mus. 48: pi. 25, f. 23-27. 



* The following key will aid in distinguishing the ten remaining genera in the white-spored 

 series of the tribe Agariceae, which are treated in the first part of the present volume. They 

 agree in having the hymenophore fleshy or membranous, not reviving, the pileus regular, the 

 stipe central, stout, fleshy, of uniform texture, and the lamellae entire, fleshy, not waxy. The 

 currently accepted genus Clitocybe differs from Laccaria in having smooth or only slightly 

 roughened spores and decurrent or adnate lamellae. These ten genera will also be included 

 in a general key to the series to be published shortly in part 4 of volume 9. 



Volva and veil absent, the latter sometimes rudimentary. 



Lamellae broadly adnate; spores globose, verruculose or echinulate. ' 42. Laccaria. 

 Lamellae sinuate; spores usually ellipsoid and smooth. 



Pileus smooth or inconspicuously decorated with fibrils or scales. 43. MelanolEuca. 



Pileus conspicuously decorated with fibrils or scales. 44. CorTinellus. 



Volva absent, veil present, usually forming an annulus. 

 Stipe eccentric. 

 Stipe central. 



Lamellae adnate or adnexed. 



Lamellae free, varying at times to adnexed or adnate. 

 Spores hyaline, rarely tinged with brown. 



Pileus viscid. 47. LimacELLa. 



Pileus dry. . < «_ . . 7„' J( KPIOTA - 



Spores green when fresh, brown in herbarium specimens. 49. Chlorophyllum. 



45. PlEtjrotus. 



46. Armillaria. 



Volva present, veil absent 

 Volva and veil both present. 



Volume; 10, Part 1, 1914] 



50. Vaginata, 



51. Venenaritjs. 



1 



