342 BRITISH FUNGI 



pale green and striate, rusty below ; gills imllid, then smoky 

 purple. 



Differs from P. areolata in the green colour on cap and stem, in 

 being solitary, and in' growing on wood. 



On rotten stumps, chips, etc. 



P. agraria. — Cap about J in. across, soon expanded, whitish, be- 

 coming grey, subumbonate, sulcate ; gills distant, broad, grey ; 

 stem about 2-J- in. long, thin, wavy, white. 



About the roots of decayed trees. 



P. chondroderma . — Cap about i in. across, campanulate, dark 

 bright brown, fragments of the \'eil on the edge ; gills dark brown, 

 edge white ; stem 2^-3 in. long, paler than the cap, base squamulose. 



In pine woods. 



P. scobicola. — Cap up to i| in. across, convex, umbihcate, smooth, 

 white ; gills brown with a red tinge ; stem about i J in. long, fibril- 

 lose, whitish. 



Distinguished in the genus by the umbilicate cap. 



On dead branches, sawdust, etc. 



** Gills very broad behind, suhdecurrent. 



P. ammophila. — Cap |-i in. across, becoming expanded and um- 

 bonate, yellowish brown ; gills dusky, powdered with the black 

 spores ; stem about 2 in. long, lower half clavate and sunk in the 

 sand, white. 



Remarkable for the lower half of the stem being thickly matted 

 with mycelium, and sunk in the sand in \\hich the fungus 

 grows. 



li! P. copropMla. — Cap about f in. across, becoming expanded and 

 umbonate, yellowish rufous ; gills rather decurrent, livid brown ; 

 stem 1-2 in. long, at first short and floccose, then elongated and 

 smooth, whitish. 



When very young the cap is co\'ered with superficial squamules 

 which soon completely disappear. 



On dung and in pastures among grass. 



P. bullacea. — Cap up to 5 in. across, soon expanded and um- 

 bonate, pale brown, striate, yellowish and silky when dry ; gills 

 broad, brown, then blackish umber ; stem about i in, long, brownish 

 with white down. 



Differs from P. bullacea in the striate cap. 



On dung and rich soil. Gregarious. 



P. physaloides. — Cap i-| in. across, campanulate, then expanded 

 and subumbonate, often depressed round the umbo, rather viscid, 

 purple-brown, then paler ; gills slightly decurrent, rusty brown ; 

 stem about i in. long, pale, base rusty. 



Differs from P. bullacea in the purple-brown cap. 



On the ground, among moss, also on dung. 



