23 



6. Pileus lighter on drying. 7. 

 Pileus darker on drying. //. longipes Pk. 



7. Lamellae at first whitish. 8. 

 Lamellae at first brownish. 9. 



8. Stipe white, hollow, pileus disc rugose. //. madeodiscum Pk. 

 Stipe white, hollow, pileus smooth. H. appendiculatum ( Hull. ) Sacc. 

 Stipe reddish, stuffed. //. squalidum Pk. 



9. Stipe less than 8 cm., pallid, fibrillose. H. atri folium Pk. 

 Stipe 8 cm. or more, white, striate. H. hynienoaphaluiH Pk. 

 Stipe 8 cm. or more, sordid white with brown stains, uneven, nodulose verrucose. 



H. Califomicum Earle. 



10. Small, pileus 1-2 cm. H. olivaesporum F.U. & Ev. 



Large, pileus 5 -11 cm - H- Candolleamun (Fr.) - v acc. 



Section Velutina 



1. Pileus small, 1-3 cm. 2. 

 Pileus larger, 5 cm. or more. 3. 



2. Pileus grayish with black fibrils, lamellae at first white. H. aggregatum Pk. 

 Pileus brown, lamellae at first purplish. H. comarvpis ( Mont. ) Sacc. 



3. Pileus white or yellowish, indistinctly fibrillate, stipe smooth, shining. 



H. nilidipes Pk. 

 Pileus white then brown, with dark innate scales, stipe squamulose. 



H. lacrimabundum (Fr. ) Sacc. 



Sect ; on Flocculosa 



1. Pileus grayish-brown. H. hirto-squamulosum Pk. 



t 



In attempting to use the above key it must be borne in mind 

 that it is constructed largely from published descriptions and 

 that these descriptions are often faulty or insufficient, hence the 

 key is necessarily purely artificial and does not attempt to indi- 

 cate the relationship of the species except as to the division of 

 the genus into sections. Further, it should be remembered that 

 the fleshy fungi of only a very small part of the vast territory of 

 North America have been studied with any degree of thorough- 

 ness, so that in all probability many forms remain to be discov- 

 ered that cannot be referred to any of the above species. With 

 these considerations in mind it is believed that such keys will be 

 found useful by those who are interested in these plants. 



New York Botanical Garden. 



