TIYMBNOMYCETES. 



Coriacei. — coriaceous ; pileus even, zoned. 



33 P. VERSICOLOR. L. 



1 — 2 from tlie margin to the base. 1 — 3 broad. Imbricated, 

 thin, plane, or somewhat concave, clastic, velvety, conspicu- 

 ously zoned: pores small, round, white or cream-coloui'cd. 

 Sometimes spuriously stipitate. Extremely variable in colour, 

 pale fawn with grej'ish zones, deep rich brown with paler 

 zones, almost black with blackish blue zones, greenish white ; 

 other varieties occur. The most common of the Polypores. 

 On stumps and posts everywhere. 



34 P. zoNATUS. Fries. 



Not hitherto, as far as I am aware, recorded as British, having 

 undoubtedly been regarded as a variety of the preceding species. 

 T think, however, we have a plant agreeing in every respect with 

 the description of P. zonatus in the Epicrisis, and with the 

 figures of this species in Sch;ieflfer and the Deutschlands Flora. 

 "Pileus between coriaceous and corky, postctiorly convex and 

 tuberculoso-gibbous, sub-zoned, thickly villous, margin be- 

 coming white ; pores minute, round or angular, obtuse, whitish. 

 Found in all countries." — Epicrisis. Moreover the distinguish- 

 ing character of P. versicolor in the Epicrisis, " depresso lajvi- 

 gato vclutino nitido, zonis discoloribus variegate," cannot 

 apply to the plant in question, which is not so common as P. 

 versicolor, but is found occasionally, principally on rails. 



3-') P. ABiETiNus. Fries Ep. 



f from the margin to the base. 1 — 2 broad. Pileus very 

 thin ; disc villous, grcj'ish white ; pores small, toothed, lilac, 

 or violet; often broadly resupinate and but little leflexed. 

 On fallen fir trees, comnjon. 



Sub-genus RESUPINATUS. 



3(j P. MEDULLA-PANIS. JaClj. 



Of uneven thickness, firm, dry, whitish ; margin defined : 

 pores upon an even horizontal surface rather short, small 

 and round. On a decayed sleeper, Spittal station. 



37 P. VULGARIS. Flies. 



Thin, closely adhering to the matrix ; margin tomentose. 

 soon smooth ; pores firm, very small, round, white. On 

 decayed posts, Knowsley. 



38 P. MOLLUscus. Pers. 



Thin, soft, snowy white; margin deeply byssoid ; pores un- 

 evenly developed, very small, round, orifices lacerated. On 

 decaj'cd wood, Knowsley 



94 



