CLASSIFICATION OF A.GARK Ul 



Sulfoformalin. 



I »isi illed w ater 25 drops 

 Sulfuric acid, pure 5.< 

 Forma I in i r , sol.) 75 d rops 



The acti f gruaiac is in turn the flesh blue and Bhould r< 



in one or two minutes. Sometimes onlj certain parts <»i the plant 

 react, ••. g., in R, subpunctata, the gills are unaffected. The 

 fovanilline turns the parts blue, Bometimes al flrsl pink, while the 

 sulfoformalin intensifies the brownish color of the cystidia and the 

 lactiferous hyphae in the .uills. We did aol tesl the "cystidia" <>f 

 the surface of the pileus and stem, where the tesl was effectively 

 used by Maire. In /.'. virescens and /.'. crustosa the lasl two chem- 

 icals had hardly any effed as compared with the quick reaction in 

 other species. Our work has been merely preliminary and covered 

 ouly ;i small Dumber of species. 



The key includes a few species no1 ye1 found in the Btate. Every 

 season seems to differ in the particular species one finds and a oiim- 

 Iter of forms still remain unidentified, bu1 the following li-t com 

 prises nil the species frequent from year i<» year, al leasl in the 

 southern pari of the Btate. 



The genus has been largely gone over ami revised since the pub- 



licatu f the Monograph (Mich. Acad. Rep. 11. 1909), and several 



additional species have been included and others more Cully de 

 scribed ami discussed. The reccm critical papers by Maire, Romell, 

 Battaille, Ricken, and others in Europe, have thrown much nee< 

 light on a number id' specie-. 



Key hi the Speeu 8 



(A) Gills unequal, alternately long and Bhort, flesh thick to the i 

 of the pileus, which is at flrsl Incurved and uever bat 

 (Compactae t . 

 la i Flesb white, unchangeable. 

 iio Gills subdistant; plant entirely whitish; pileus 8-16 en 99 /.'. 



delica Fr. 

 (bb) Gills close. 

 (c) Pileus whitish then sooty-gray, 5-7 cm. broad. 102. /.' 



Fr. 

 (cc) Pileus net becoming sooty in age. 

 id) Odor strong, alkaline; pileus large, 10-80 cm. broad, whit; 



then pale rusty-ochraceus. /.'. , i'k 



(dd) Odor none; pileus 1-8 cm. broad, whit! 

 var. brevipes I'k 

 i.ia) Flesh changing t<> reddish or blackish in 

 i in Flesh at length incarnat or rusty-reddish; odor 



when drying. 104. !'■■■ 

 (bb) Flesh at length blackish. 

 i c) Gills subdistanl I 



u Mack. 100. /.'. nig 



