384 FUNGUS-FLOEA. 



** Pyxidati. Medium size ; gills slightly distant, narrow, 

 narrowed at liotli ends. 



*** Umhelliferi. Gills very distant, broad, usually thick. 



II. Mycenaeii. 



Pileus campanulate at first, margin straight and pressed 

 to the stem. 



* 



Campanellae. Gills broad, perfect, unequal. 



** Integrelli. Gills fold-like, narrow. 



I. COLLYBIAEII. 



* Hydrogrammi. 



Omphalia hydrogramma. Fr. 



Pileus 2-3 in. across, flesh thin, flaccid, deeply umhilicate, 

 very hygrophanous, marginal portion spreading, rather wavy, 

 stiiate, livid- white, whitish when dry ; gills very decurrent, 

 closely crowded, narrow, arcuate, margin quite entire, very 

 unequal, livid-white ; stem about 3 in. long and 3 lines 

 thick, distinctly cartilaginous, hollow, glabrous, base rooting, 

 sometimes shorter, round, and straight, often decumbent and 

 caespitose, commonly compressed and undulate, livid, apex 

 naked. 



Agaricus (Omphalia) hydrogrammus. Fries, Epicr., p. 120 ; 

 Cke., Hdbk., p. 92; Oka., lUustr., pi. 239. 



Among damp and rotting heaps of leaves, &c. 



Subcaespitose, of one colour, livid or whitish-livid, when 

 moist, becoming whitish when dry, and in this state some- 

 what resembling G. phyllophila ; the latter differs in the 

 elastic, externally fibrous stem, the piano-depressed, never 

 truly infundiblilifona pileus, and the broader, very slightly 

 decurrent gills. 



Omphalia detrusa. Fr. 

 Pileus about 1^ in. across, rather fleshy, convex then more 

 or less expanded and becoming umbilicate, even, glabrous, 



