iqiq] mcdougall—stropharia 263 



inent, but is usually perfectly apparent. The lamellae in mature 

 specimens are adnate to adnexed. 



Harper (6, 7) has suggested that Stropharia epimyces is identical 

 with Pilosace algeriensis (Fries) Quel. While it is entirely pos- 

 sible that this may be true, our plant cannot belong to Pilosace, 

 as we understand that genus, since it has an annulus and the 

 lamellae are not free. 



The fact that all species of Agaricus and Stropharia thus far 

 studied {Agaricus comtulus, see Atkinson, 3, is a possible exception) 

 develop in the same way is of interest as indicating a close relation- 

 ship between these two genera. The main taxonomic characters 

 that have been used to distinguish these genera are the free gills 

 in Agaricus and the attached gills in Stropharia. Atkinson 

 (4), however, has found that in developmental stages of Agaricus 

 Rodmani the gills are often attached, and that even in mature 

 specimens of A . Rodmani and A . campestris the gills are sometimes 

 adnexed, thus indicating that such characters do not clearly dis- 

 tinguish the genera. 



University of Illinois 

 Urbana, III. 



LITERATURE CITED 



1. Atkinson, G. F., Preliminary notes on some new species of fungi. Jour. 

 Myc. 8:110-119. 1902. 



2. , A mushroom parasitic on another mushroom. Plant World 



10:121-130. 1907. 



3- , The development of Agaricus aroensis and A. comtulus. Amer. 



Jour. Bot. 1:3-22. 1914. 

 4' , The development of Lepiota cristata and L. seminuda. Mem. 



N.Y. Bot. Gard. 6:209-224. 1916. 

 5' , The development of Agaricus Rodmani. Proc. Amer. Phil. Soc. 



54:309-343. 1915. 

 6. Harper, E. T., The probable identity of Stropharia epimyces (Peck) Atk. 



vfiih. Pilosace algeriensis Yrits. Mycologia 5:167-169. 1913. 

 7« , Two parasitic mushrooms. Mycologia 8:65-71. 1916. 



8. McDouGALL, W. B., Some interesting mushrooms of Champaign County. 

 Trans. 111. Acad. Sci. 9:125-128. 1916. 



9. Peck, C. H., Report of the State Botanist. N.Y. State Mus. Nat. Hist. 

 Bull. 133. 1884. 



10. Sherman, Helen, The host plants of Panaeolus epimyces Peck. Jour. 

 Myc. 11:167-169. 1905. 



11. Zeller, S. M., The development of Stropharia ambigua. Mycologia 

 6:139-144. 1914. 



