122 AGARICUS. 



Mycena. vex, somewhat campanulate, obtusely umbonate, at length more 

 or less expanded, minutely pulverulent, slightly rugulose, striate 

 when moist. Stem 6 cent. (2% in.) long, 2-4 mm. (1-2 lin.) thick, 

 fistulose, attenuated downwards, flexuous, rigid, white and pruin- 

 ose above, deep sienna-brown below, dark brown and villous at 

 the base, shining, quite smooth. Gills rounded, quite free, with 

 exception of a connecting tooth, broad, rather distant, pale, 

 sprinkled and fringed with dull purple spiculse, interstices veiny. 



The base of the stem is embedded more or less in a spongy mass by which 

 it adheres to the mast. 



Among beech-mast, oak-leaves, &c. Rare. 



Allied to A. pelianthinus but remarkably distinct. Fr. Spores elliptic. 

 Name /3aAwos, acorn, beech-mast, &c. Berk. Mag. Zool. Bot. i. /. 15. /. 2. 

 Out. p. 121. Fr. Monogr. i. p. 196. Hym. Eiir. p. 130. C. Hbk. n. 167. 

 Illust. PL 156. 



250. A. Iris Berk.- Pileus %- 3 /& in. broad, membranaceous, 

 hemispherical, obtuse, striate, umber, clothed with blue fibrillcE 

 which are glued down to the epidermis, scattered in the centre, 

 thicker and more free on the margin which is slightly denticulate. 

 Stem 4-9 cent. (i}4-3)4 in.) long, not 2 mm. (i lin.) broad, not 

 rooting, blue below, subrufescent above, the down below de- 

 pressed and blue, above nearly white, minutely but distinctly fas- 

 ciculato-pilose. Gills free or slightly adnexed, linear, pale cin- 

 ereous, the margin sometimes denticulate. 



Fasciculate or scattered, brittle ; when young the pileus and stem bright 

 sky-blue and beautifully tomentose. The little fibrils glued down to the cuti- 

 cle are very characteristic. When the stem is extremely elongated it is some- 

 times nearly smooth. 



On fir stumps and sticks. Uncommon. Sept.-Oct. 



It seems so much allied to A. marginellus that the figures of A. Iris Berk. Out. 

 and of A. multiplex by Gonn. dr" Rab. t. 7. f. 4 can scarcely be distinguished. 

 Fr. The denticulate gills place it in this section. Spores 7x4 mk. IV. P. 

 Name *Ipi?, the rainbow. From its varied tints. Berk. Eng. Fl. v. p. 56. 

 Out. p. 123. t. 6.f. 3. Fr. Hym. Eur. p. 131. C. Hbk. n. 174. Illust. PL 

 161. S. My col. Scot. n. 138. 



251. A. marginellus Pers. Pileus 6-8 mm. (3-4 lin.) broad, 

 somewhat fuscous when young, then changeable in colour, slight- 

 ly fleshy, campanulate, not viscid, with exception of the very 

 smooth darker umbo slightly striate and somewhat azure-blue- 



floccose. Stem somewhat tomentose - rooted, with the same 

 flocci as the pileus. Gills slightly adnexed, distant, white or 

 cinereous, fringed at the edge with dark floccules (commonly 

 azure-blue or red). 



