CLASSIFICATION OP AGARICS 



cm. Long, I t.5 cm. thick, subequal <>r irregularly enlarged, 

 fragile, surface at iln- verj firsl covered bj a sulphur-yellow put 

 yerulence, at length </<>ih<i by swlphur-yellovc granule 

 hi base, white beneath, spongy-stuffed, becoming 

 SPORES globose, echinulate, 6-8 micr. (incl. apiculus), whiU 

 muss. CYSTIDIA aunierous, subhynienium scarcely differentia 

 BASIDIA 15x9 micr., I spored. TASTE and ODOR slighl or some- 

 what disagreeable. 



Gregarious. <>n lawns, roadsides, «>r in frondose woods among 

 grass, etc. July-September. Southern Michigan. Sol infrequent 

 during a few seasons. 



This Bussula is closely allied t" the preceding section, Its de- 

 velopment lias been carefully studied. When the caps are I nun.. 

 or less broad the margin is definitely subinrolled. The texture of 

 the trama is then very firm ami tough and the entire Biirface of 

 both cap and stem is covered, as seen under the microscope, by a 

 differentiated thin layer composed of short, dense, erecl yellow 

 hairs or hyphae. These tryphae are continuous at first with the 

 trama but become separated in masses as the pileus ami stem en 

 large, adhering at length to the surface of the mature pileus and 

 >-!rni as delicate, appressed, pulverulent-flocculose, sulphur-yellow 

 granules. The hymenium contains very numerous cystidia with a 

 dark-brown, granular content, which project into the subhymeninm 

 ami often connect with similarly colored hyphae which intermingle 

 with the gill- trama. (Lactiferes.) The young cystidia project above 

 the basidia but later are even with them. These brownish cystidia 

 give a brown-dotted appearance to the sides of the gills as seen 

 under low power of the microscope. 



Microchemical tests: <;. (Flesh and gills become rapidly light 

 blue, then dark blue.) S V. (Gills first turn reddish then slowly 

 blue; flesh scarcely affected.) F S. (Cystidia colored brown.) 



This species is easily confused in the old, discolored stage with 

 R. pectinatoides and /.'. foetentula, since both have a livid yellowish 

 brown cap at times when mature, well marked tuberculate stria 

 th>ns. and are about the same size. They lack, however, the peculiar 

 yellow granules of R. pulverult nta. | For further remarks -• e Mich. 

 Acad. Rep. 1 1, p. 77. 1909.) 



