100 Forty-fifth Report on the State Museum. 



Omphalia Fibula Bull. 

 Button Omphalia. 



(Hym. Europ. p. 164. Syl. Fung. vol. V, p. 331.) 



Pileus membranous, commonly convex or hemispherical and 

 umbilicate, striatulate when moist and varying in color from pale- 

 yellow to orange, even and paler when dry ; lamella? distant, 

 arcuate, strongly decurrent, white ; stem slender, commonly long 

 in proportion to the breadth of the pileus, colored like or a little 

 paler than the pileus; spores narrowly elliptical, minute, .00016 

 in. long, .0008 broad. 



Pileus 2 to 5 lines broad; stem 1 to 2 in. long, scarcely .5 line 

 thick. 



Mossy ground and prostrate mossy trunks of trees in woods 

 or open places. Common. April to November. 



Yar. conica. Pileus conical, not umbilicate, sometimes papil- 

 late. Fulton county. 



This is a very small species and of frequent occurrence in damp 

 mossy places, but rarely abundant. Its pileus varies in color 

 from almost white to bright orange. Large forms approach the 

 preceding species in appearance. 



Omphalia Swartzii. 



Agaricus Fibula var. Swartzii Fr. 

 Swartz's Omphalia. 



(Hym. Europ. p. 164. Syl, Fung. vol. V, p. 331.) 



Pileus rather firm, even, whitish, dish brownish; stem whitish, 

 somewhat violaceous at the top. In other respects like the pre- 

 ceding species. 



Although this plant scarcely differs from O. Fibula except in 

 color, and is regarded by almost all mycologists as a mere variety 

 of it, yet it is so peculiar and so constant in its color and so easily 

 recognized that it seems best to separate it as a species. 



Omphalia corticola Pk. 



Bark-inhabiting Omphalia. 



(Report 44, p. 18) 



Pileus submembranous, convex, then expanded and umbilicate, 

 distantly radiate-striate, ivhitish or pale-cinereous ; Lamellae narrow, 

 distant, at first arcuate and adnate, then truly decurrent, white; 



