l8o AGARICUS. 



Pleurotus. lower white. Stem none. Gills pallid tan-colour, rather thick, 

 distant, somewhat forked at the base, slightly undulated, obscure- 

 ly wrinkled at the base, the interstices scarcely reticulated. 



On wood. Shrewsbury. 



Name after Rev. W. A. Leighton. Berk. Ann. Nat. Hist. xiii. /. 9. /. i. 

 Out. p. 138. C. Illust. PL 260. Fr. Hym. Eur. p. 179. 



392. A. algidus Fr. Pileus 2.5-5 cent - ( l ~ 2 in.) broad, umber 

 or rufous brown, fleshy, at first resupinate, then expanded, some- 

 what reniform, unequal, even, smooth, viscous; flesh thin, moder- 

 ately pliant, whitish. Gills at first concurrent, at length appear- 

 ing adnate, crowded, rather broad, sometimes crisped at the base, 

 becoming pallid yellow. 



Manifestly allied to A. mastrucatus and A. atro-cceruleus, but \he pellicle is 

 thin, viscid only in a moist state, and remarkably distinct in the full-grown 

 pileus, being smooth, umber or rufus-brown. From an excentrically cup- 

 shaped form, which is adnate at the back and sessile, with concurrent gills, it 

 is unfolded into reflexed pilei, which are commonly caespitoso-imbricated. 

 When young the pileus is often covered with pruina. In the same places in- 

 dividual specimens have occurred quite similar, but departing from the type in 

 the bluish-grey colour of the pileus. 



On trunks. Linlithgowshire. 



Name algidus, cold. From its being found in northern regions. Fr. 

 Monogr. i. p. 255. Hym. Eur. p. 180. Berk. Out. p. 138. C. Hbk. n. 129. 

 Illust. PL 260. Brigant. t. 20. A. subsessilis Fl. Dan. t. 1552. f. i. A. 

 lateralis FL Dan. t. 1556. /. 2. A. cynotis Pers. Myc. Eur. 3. t. 23. /. 5. 



393. A. fluxilis Fr. Pileus 2.5 cent, (i in.) broad, somewhat 

 umber, thin, dimidiate, horizontal, plane, reniform, covered vtiih a 

 fluid gelatinous stratum which is not covered with a cuticle ; the 

 flesh proper very thin, pallid, soft. Gills rounded behind, 2 mm. 

 (i lin.) broad, linear, distant, distinct, whitish j few (3-5) reaching 

 the base, but very many shorter ones intermixed. 



As many as 31 of the shorter gills may be counted at the margin between 

 those which reach the base. Solitary, sessile. A most distinguished species, 

 not to be compared with any other. Never resupinate, but adhering by a 

 single lateral point, to which all the gills converge. 



On wood and sawdust. Glamis, 1877. Oct. 



When young it is covered with an extremely thin, vanishing membrane, so 

 that it may be truly said to be without a cuticle. Spores elliptical-oblong, 

 guttate, 10 mk. Q. Name flux i/is, fluid. From the fluid stratum of the 

 pileus. Fr. Monogr. i. p. 256. Hym. Eur. p. 180. B. & Br. n. 1756. S. 

 Mycol. Scot. n. 226. C. Illust. PI. 244. 



394. A. cyphellseformis Berk. Pileus 4 mm. (2 lin.) or more 

 broad and high, cinereous, cup-shaped, then dependent, very 



