OMPHALIA. 401 



Agaricus (Omplialia) direda, Berk, and Broome, Ann. Nat. 

 Hist., no. 1931 ; Cke., Hdbk., p. 100 ; Cke., Illustr., jdI. 251a. 



On dead leaves ; gregarious. 



Stem slightly rufous, thread-like, not an inch high. 

 (B. and Br.) 



Omphalia belliae. Johnst. 



Pileus about i in. high and across, membranaceous, dry, 

 top-siiaped, infundibuliform, mouth partly closed by the 

 incurved margin, pale wood-colour; gills decurrent, thick, 

 paler than the pileus, interstices veined; stem about 1^ in. 

 long, not 1 line thick, equal, cartilaginous, brownish below, 

 pale above, hollow, adhering by a white cottony base. 



Agaricus helliae, Johnston, Ann. Nat. Hist., ser. i., vol. vi., 

 t. 10, f. 1 ; Cke., Illustr., pi. 251a ; Cke., Hdbk., p. 100. 



On dead stems of reed. 



Eeadily recognised by the jDeculiar form of the pileus. 



Omphalia gracillima. Weinm. 



Snow-white. Pileus 1-3 lines across, membranaceous, 

 somewhat downy or ilocculose, sulcate ; gills decurrent, 

 rather distant, thin ; stem about h in. high, very slender, 

 base cottony. 



Agaricus gracillimus, Weinm., Ross., p. 121 ; Cke., Hdbk., j). 

 100; Cke., Illustr., pi. 252, f. 1. 



On decaying herbaceous stems, and in damp places. 



A very delicate species, drying up, white, rather flocculose 

 when young ; stem minutely hollow, as thin as a hair, soft, 

 3-6 lines long, base cottony ; pileus membranaceous, hemi- 

 spherical, sometimes umbilicate, sometimes papillate, never 

 turned up, 2-3 lines broad, flocculose then almost glabrous, 

 manifestly striate when moist. Gills decurrent, thin, rather 

 distant, alternate ones shorter. 



Agreeing in many points with 0. sfellata, but more delicate, 

 pileus at first flocculose, form, and thin gills distinguish it. 

 (Fries.) 



Omphalia buUula. Brig. 



Wholly white. Pileus 1-2 lines across, membranaceous, 

 even, hemispherical, diaphanous ; gills arched, decurrent ; 

 stem not 1 in. long, very slender. 



VOL. JI. 2 D 



