THE A.GARICACEAE OF MICHIGAN 



tudinally. The SPOKES vary from flesh color to bright rose and 

 are often prominently angled, sometimes tuberculate. CYSTIDIA 

 are uusually lacking except in L. seticeps. 



The species of ibis genus are rather difficult to diagnose. In 

 some cases the color is rather striking, as for example, of L. formosa 

 and /.. rosea; in others the color varies considerably in different 

 specimens of the same species, e. g., L. asprella, so that a microscopic 

 study must lie the final resort. Not much is known concerning their 

 edibility, although several species appear- quite frequently. Some of 

 ihc species are rarely found and this accounts for the smaller num- 

 ber of species for the State. All species likely to occur in the State 

 are included in the key. 



Key to the Species 



(a) Stem and pileus rose-tinged; on sphagum. 616. L. rosea Long- 

 year, 

 (aa) Stem and pileus white, becoming blackish on drying; pileus 

 striate; gills adnexed; spores 10-12.5x7-9 micr. L. transformata 

 Pk. 

 (aaa) Stem and pileus waxy-yellowish; pileus scaly to fibrillose. 618. 



L. formosa Fr. 

 (aaaa) Stem and pileus neither rosy, white nor yellowish, 

 (b) Pileus, stem and gills green (aeruginous). 

 (c) Odor strongly of mice. L. incana Fr. 

 (cc) Odor not mentioned. L. aeruginosa Pk. 

 (bb) Pileus and stem grayish-brown to fuscous, dark brown, or 

 light-leather color, 

 (c) Pileus hygrophanous, striatulate. 

 (d) On rotten wood; gills rounded behind, nearly free, whitish; 



spores 10 x 7.5 micr. L. undulatella Pk. 

 (dd) On the ground; gills adnate-seceding, tinged gray; spores 

 elongate, 10 x 6-8 micr. 621. L. asprella Fr. var. 

 (cc) Pileus not hygrophanous. 

 (d) On rotten wood; pileus walnut-brown; gills slightly adnexed. 



Spores subglobose. 617. L. seticeps Atk. 

 (dd) On the ground; pileus paler. 



(e) Pileus innately silky and substriatulate; gills whitish, 

 broad, adnexed; stem glabrous; spores quadrate, 9-11 x 

 9-10 micr. L. solstieiales Fr. (Sense of Ricken.) 

 (ee) Gills, stem and pileus gray, gills broad; spores sphoeroid, 

 8-10 micr. L. grisea Pk. 

 (bbb) Pileus and stem violet, bluish -black, smoky or steel-blue, 

 (c) Stem dotted with dark squamules, at least at apex. 



(d) Gills with a black serrulate edge; on the ground. 619. L. 



serrulata Fr. 

 (dd) Gills with edge concolor; pileus fuscous, squamulose; 

 stem tinged lavender, squamulose; on rotten wood. 614. 

 /.. placida Fr. 

 (c) Stem glabrous or with few evanescent squamules. 



(d) Gills with a black serrulate edge; pileus grayish-white, um- 

 bilicus darker and scaly. L. suoserrulata Pk. 

 (dd) Gills unicolorous. 

 (e) Pileus hygrophanous, striate (moist), squamulose to gla- 

 brous; gills grayish, adnate; spores 11-14x6-8 micr. 621. 

 L. asprella Fr. 



