LACTARIUS. 93 



Tribe III. RUSSULARES. Stem central. Gills pallid then changing colour, Lactarius 

 afterwards darker, glancing when turned to the light, at length white-pruinose. 

 Milk at the first white, mild or from mild turning acrid. 



* Pileus at the first viscous. 



** Pileus unpolished, squamulose, villous or pruinose. 



*** Pileus polished, smooth. 



Tribe IV. Pleuropus. Stem excentric or lateral. Growing on trunks. 



Tribe I. — Piperites. 

 * Tricholomoidei. Pileus viscid when moist, &^c. 



1. L. scrobiculatus Fr. — Pileus 10 cent. (4 in.) and more 

 broad, yellow, commonly zo?ieless, fleshy, but not compact, at 

 first convex, umbilicate, at length infundibuliform, obtuse, with 

 agglutinated villous down, very viscid when moist, margin in- 

 volute, bearded, at length when old unfolded and almost naked ; 

 flesh lax, whitish, but commonly becoming yellow when broken. 

 Stem 4-6 cent. {\]4.-2Yz in.) long, as much as 2.5 cent. (1 in.) 

 and more thick, stout, often stuffed when young, but soon remark- 

 ably hollow, equal, light yellow, pitted with broad roundish spots, 

 smooth, somewhat viscid, pubescent at the base. Gills adnato- 

 decurrent, thin, crowded, quaternate, whitish. Milk plentiful, 

 at first white, soon sulphur-yellow when exposed to the air. 



Very acrid, odour not unpleasant. Pileus sometimes as much as 30 cent. (12 

 in.) broad. The piletis becomes pale in open places, and is sometimes zoned. 

 In very watery places when broken it occasionally becomes azure-blue-purple, 

 milk white, soon serous. 



On the ground. Bristol. 



Spores subsphaeroid, echinulate, 11-12x8-10 mk. K. ; subglobose, 6-8 mk. 



C.B.P. Name — scrobis, a trench. From the pitted stem. Fr. Mo?iogr. ii. 

 p. 152. Hym. Eur. p. 422. Grevillea, vol. xii. p. 42. Ag. Sch&ff. t. 227. 



Krombh. t. 58. f. 1-6. B. milk watery white becoming violet. Barla t. 18. 

 /• 3-6- 



2. L. torminosus Fr. — Pileus 7.5 cent. (3 in.) and more broad, 

 ■pallid flesh-colour, laxly fleshly, somewhat fragile, obtuse, de- 

 pressed, becoming even, viscid when moist, somewhat zoned, 

 with a white-fibrillose beard at the margin and towards the 

 margin which is at first involute ; flesh pallid. Stem 6-9 cent. 

 ( 2 X~3/^ in.) long, 18 mm-2.5 cent. (3^-1 in.) thick, stuffed soon 

 hollow, equal or attenuated downwards, delicately adpressedly 

 tomentose or becoming smooth, even or obsoletely pitted, dry. 

 Gills adnato-decurrent, 2-3 mm. (i-i}4 lin.) broad, very thin 

 and crowded, unequal but rarely connected by branches, paler 

 than the pileus. Milk white, unchangeable, acrid. 



Inodorous. It frequently varies pale-ochraceous. It also occurs with the 



