LEUCOSPORI. 



151 



The 



its gills. Stature a?id history the same. Species of the same Omphalia. 

 stature also occur among the Ca?ttharelli and Marasmii. 

 pileus is most frequently indeed um- 

 bilicato-infundibuliform, but this fea- 

 ture is in no wise constant or essential, 

 nor is it a mark of more importance 

 that the gills are often branched. Fr. 

 Hym. Eiir. p. 154. 



The species are generally well 

 marked. They prefer a moist situation, 

 and stand changes of temperature well. 

 The larger ones are peculiar to moun- 

 tainous regions. They are inodorous, 

 and none are known to be edible. 



IX. Agaricus {Omphalm) inn- 

 belli/erzis. Natural size. 



I. Collybiarii. Pileus at the first dilated, 

 with the margin inflexed. These are divided 

 by their gills into three very distinct groups. 



* Hydrogrammi {A. hydrogrammus). 

 Commonly comparatively large, gills nar- 

 row, very crowded. Besides the essential mark afforded by the stem, they 

 differ from the cyathiform Clitocybae by their gills, which are truly decurrent 

 at the first, very crowded and arcuate. 



** Pyxidati {A. pyxidattis). I?itennediate, gills slightly distant, narrow, 

 attenuated at both ends. 



*** Umbelliferi {A. umielliferus). Gills very dista?it, broad, comvwjily 

 thick. {Xerotus turfosus is likely to be looked for here.) 



II. Mycenarii. Pileus at the first campanulate, margin straight, pressed to 

 the stem. 



* Campanellae {A. campanella). Gills broad, perfect, 7ineqiial. 

 ** Integrelli {A. integrellus). Gills fold-like, narrow. 



I. — Collybiarii. 



* Hydrogrammi. Gills narrow, very crowded. 



322. A. hydrogrammus Fr. Of one colour, livid or whitish- 

 livid when moist, whitish when dry. — Pileus 5 cent. (2 in.) and 

 more broad, so7newhat ineinbranaceous, flaccid, deeply umbilicate, 

 remarkably hygrophanous, border spreadi?ig, somewhat undulated, 

 striate. Stem 7.5 cent. (3 in.) long, 6 mm. (3 lin.) thick, remark- 

 ably cartilaginous, hollow-fistulose, smooth, rooted and white- 

 bearded at the base, sometimes shorter, round, straight, sometimes 

 elongated, often decumbent and ca^spitose, commonly compressed 

 and undulated, livid, naked at the apex. Gills deeply decurrent, 

 very crowded, narrow, arcuate, quite entire, very unequal, livid- 

 whitish. 



Somewhat caespitose. When in the dry state it has been confounded by 

 most authors with A. phyllophilus. 



