Part 3, 1917] AGARICACEAE 147 
63. PAXILLUS Fries, Gen. Hymen. 8. 1836. 
Rhymovis Rab. Deutschl. Krypt.-Fl. 1: 453. 1844. 
Pileus fleshy, putrescent, solitary or gregarious, often somewhat irregular; lamellae readily 
separable from the context, adnate or decurrent; spores sordid or ochraceous; stipe central or 
somewhat eccentric, fleshy; veil none. 
Type species, Paxillus involutus (Batsch) Fries. 
Stipe subglabrous. 1. P. involutus. 
Stipe tomentose-hairy. 2. P. atrotomentosus, 
1. Paxillus involutus (Batsch) Fries, Gen. Hymen. 8. 1836. 
? Agaricus lateralis Schaeff. Fung. Bavar. 4: Ind. 31. 1774. 
Agaricus involutus Batsch, Elench. Fung. Contin. 1: 39. 1786. 
Pileus convex to expanded or depressed, 4-8 cm. broad; surface variable in color, grayish, 
yellowish-brown, or teddish-brown, margin downy and inrolled when young; context yel- 
lowish, becoming brownish when bruised; lamellae decurrent, reticulate on the stipe, pallid 
to greenish-yellow, changing to brown when britised; spores ovoid, 7-9 X 4-5 yu; stipe central 
or eccentric, short, equal, concolorous, 3-5 cm. long, 1~2 em. thick. 
Type Locatrry: Germany. 
Hasitat: On open ground or on dead logs and stumps in woods. 
DIsTRIBUTION: Canada to South Carolina and west to Oregon and California; also in Europe. 
InLusrRations: Atk. Stud, Am. Fungi ed. 1. f. 155; ed. 2. f. 159; Batsch, Elench. Fung. f. 61; 
Fries, Sv. Aetl. Svamp. pl]. 75; Gill. Champ. Fr. pl. 362 (514); Hard, Mushr. f. 232; Murrill, Ed. 
Pois. Mushr. f. 7; Ricken, Blatterp. Deutschl. 1. 28, f. 4; Sow. Engl. Fungi pl. 56. 
Exsiccatt: Herpell, Prap. Hutpilze 90; Sydow, Myc. Mar. 1506. 
2. Paxillus atrotomentosus (Batsch) Fries, Epicr. Myc. 317. 1838. 
Agaricus atrotomentosus Batsch, Elench. Fung. 89. 1783. 
Pileus compact, convex, becoming expanded or centrally depressed, solitary or cespitose, 
7.5-15 cm. broad; surface varying from subglabrous to scabrous-granulose, sometimes tomen- 
tose-hairy on the disk, often minutely rivulose, ochraceous-red, ferruginous-brown, or reddish- 
brown, margin sometimes paler; context white, occasionally emitting an unpleasant, dirt-like 
odor; lamellae crowded, rather broad, adnate or slightly decurrent, somewhat branched and 
anastomosing at the base, pale-creamy-yellow, the interspaces venose; spores ellipsoid, 5-6 X 
3-4 w; stipe firm, stout, solid, eccentric or lateral, rarely central, densely tomentose-hairy, 
dark-brown, 7.5-15 cm. long, 1.2-3 em. thick. 
TYPE LOCALITY: Europe. 
Hasirat: On the ground and on much decayed wood of pine and hemlock.. 
DistRIBuTION: Canada to North Carolina and west to Oregon; also in Europe. 
InLustRations: Atk. Stud. Am. Fungi ed. 1. f. 157; ed. 2. f. 161; Batsch, Elench. Fung. f. 32; 
Gill. Champ. Fr. gl. 360 (512); Hard, Mushr. f. 233; Lucand, Champ. Fr. pl. 18; Ricken, Blatterp. 
Deutschl. pi. 28, f. 4. 
Exsiceart: Roum. Fungi Gall. 3402. 
DOUBTFUL AND EXCLUDED SPECIES 
Paxillus aurantiacus Ellis, Bull. Torrey Club 9: 18. 1882. Described from specimens 
collected on moss-covered cedar logs in a swamp. No specimens were found by Earle in the 
Ellis collection. The spores are described as hyaline. 
Paxillus griseotomentosus (Secr.) Fries, Epicr. Myc. 318. 1838. (Agaricus griseo- 
tomentosus Secr. Myc. Suisse 2: 384. 1833.) Reported from Canada and New England, 
but probably confused in this country with P. atrotomentosus. 
Paxillus hirsutus Peck, Bot. Gaz. 4: 169. 1879. Described from specimens collected 
on stumps at Belleville, Ontario, and also reported from New Jersey. The type specimens 
are poor, but apparently represent a young stage of Paxillus atrotomentosus. 
Paxillus porosus Berk.; Lea, Cat. Pl. Cine. 54. 1849. See Boletinellus porosus (Schw.) 
Murrill, N. Am. Flora 9: 158. 
Paxillus pubescens Ellis, Bull. Torrey Club 6: 76. 1876. See Gomphidius viscidus (1,.) 
Fries. 
