84 Journal of the Mitchell Society [December 



has been done only after careful comparisons and correspondence 

 with the ])est European authorities. 



Unless otherwise stated all numbered collections are from Chapel 

 Hill, N. C. 



Important American Literature: 



Peck. N. Y. St. Cab. Kept. 23: 78. 1872. Bot. ed.; also N. Y. St. Mus. Kept. 

 49:32. 1896. Bot. ed. 



MuRRiLL. N. Am. Flora 9: 352. 1916 (as Gymnopus); and 9: 287. 1915 (as 

 crinipellis) . 



Lloyd. Collybias of Cincinnati. Mycological Notes No. 5. Dec, 1900. 



Kauffman, C. H. Collybia. Mich. Geol. and Biol. Survey Publication, Bio- 

 logical Series 5. 1918; also Agaricaceae of Michigan, p. 749. 1918. 



Morgan. Journ. Cincinnati Soc. Nat. Hist. 6: 70. 1883. 



Besides the well known works of the older mycologists see the re- 

 cent important monograph by Sartory and Maire, Synopsis du genre 

 Collybia, Paris, 1918. Also see Ricken, Die Blatterpilze 2: 400, pis. 

 106-9. 1915; Lange, Studies in the Agarics of Denmark—Ill. Dansk 

 Bot. Ark. 2, No. 7: 10, .3 pis. 1917. 



KEY TO THE SPECIES 



Stem stout, striate, in a few cases stuffed, not velvety 1 



Stem more slender, glabrous or pruinose, not distinctly striate or velvety 5 



Stem distinctly velvety 11 



1. Cap white or nearly so C. maculata (1) 



1. Cap red or chestnut brown, or reddish ochraceous 2 



1. Cap gray, grayish brown or olive 3 



2. Gills pure white; stem stout and enlarging downwards C. butyracea (2) 



2. Gills pure white; stem not stout and nearly equal C. dryophila (3) 



2. Gills spotted with red C. distorta (7) 



3. Cap viscid; stem with a long root C. radicata (8) 



3. Cap not viscid 4 



4. Gills blackening when injured C. semitalis (9) 



4. Gills not blackening when injured C. platyphylla (10) 



5. Growing on decaying fungi, small, bufify tan C. cirrata (12) 



5. Growing on pine cones, small, threads at base white C. conigena (13) 



5. Growing on magnolia cones, threads at base buff C. conigenoides (14) 



5. Growing on thic-k beds of moss, small, brown C. clusilis (22) 



5. Not growing on cones or fungi 



6. Cap less than 12 mm. broad; plant white all over C. alba (15) 



6. Cap larger; plant not pure white 7 



7. Gills white or nearly so 8 



7. Gills distinctly yellow C. exsculpta (11) 



7. Gills buff color, no tint of lilac C. exsculpta (a form) (11a) 



7. Gills brownish-lilac, or tan with tints of brownish-lilac 9 



8. Growing on damp earth; plant small, the stem base with a mat of tawny 



