1923] The Laccarias and Clitocybes of North Carolina 125 



2.5-3x3.7-4.8/*). For the toxic effects of these two forms see the 

 original descriptions. Peck considers the latter as more serious in 

 its effects than the former, which, in the cases reported by him, 

 caused only a profuse perspiration in man, but the death of rabbits 

 and guinea pigs; later, however, Roberts (Mycologia 13: 42. 1921) 

 found its effects to be somewhat more serious, causing profuse perspi- 

 ration, interference with vision, diarrhoea and other unpleasant 

 symptoms. 



For good illustrations see Peck (1. c, as C. sudorifica) ; Sowerby, 

 Engl. Fungi, pi. 123, 1798; Cooke, Ills. Brit. Fungi, pi. 104 (142). 

 (larger than American plant), pi. 178 (as var. minor, like American 

 form) ; Gillet, Champ. Fr., pi. 117. 



929. Gregarious in grass in northwest side of Arboretum, October 18, 1913. 

 There is another group of these plants in the northeast side of the 

 Arboretum, near the smallest live oak tree. Both of these groups appear 

 every fall. 



977. In hillside pasture, west side of Glen Burnie Farm, November 11, 1913. 

 1466. Pasture, east side of Glen Burnie Farm, November 2, 1914. 



Asheville. Common, often in lawns under trees. Beardslee. 

 20. Clitocybe rivulosa (Pers.) Fr. 



Plates 32 and 33 



Cap up to 5.5 cm. wide, usually 3.5-4 cm., irregularly lobed, ele- 

 vated and depressed ; covered with a thin, whitish or light tan super- 

 ficial layer that is marked by many rivulose lines and collapsed areas 

 that show the cartilage colored flesh below ; margin inturned always, 

 milk-white when young. Flesh barely mealy in taste, not bitter, 

 cartilage color, rather brittle, only about 2 mm. thick. 



Gills light fleshy-cartilage color, somewhat crowded, not decur- 

 rent, about 3 mm. wide in center. 



Stem only 1-1.5 cm. long, about 4.5-5 mm. thick, color and sur- 

 face just like the cap ; firm and solid. 



Spores (of No. 907) white, smooth, elliptic, very small, 2.6x4.2/*. 



The characters are well shown in photo of No. 907. The rivulose 

 markings of the cap are remarkably like those of Clitopilus nova- 

 horacensis. 



Rare, and heretofore reported in the United States only from 



