167 



2. Context yellowish brown. 3 

 Context reddish orange ; plants growing on irunks of yiin/'perus. 8 



3. Spores hyaline. 4 

 Spores yellowish brown. 6 



4. Pileus becoming more or less rimose with age. 5 

 Pileus covered even in age with a smooth horny crust. /*. Calkinsii Murrill 



5. Pileus simple, sulcate, sometimes polished, margin usually narrow and rounded ; 



not found on species of Prtinus. P. igniarius (I-.) Murrill 



Pileus terraced, imbricate or semi-resupinate, rarely sulcate, never polished, 

 margin broad, making an obtuse angle ; found on species of Primus. 



P. fulvits (Scop.) Murrill 



6. Pileus soon becoming rimose. 7 

 Pileus not rimose, broadly sulcate, zoiiate, tubes thin-walled, spores 3/i in diam- 

 eter, spines large and abundant ; growing on oak. 



P. Everhartii(YX\. Sc Gall.) Murrill 



7. Tubes long, over 0.5 cm. each year, walls thin, pores large, 3 to a mm., spores 



3-4//, cystidia present ; rare on oak. P. praeriniosiis Murrill 



Tubes very short, 0.1-0.5 '^™- Jo"g each year, walls equaling pores in thickness, 



mouths small, 5 to a mm., spores 4-5/', cystidia none ; abundant on Kobinia. 



P. Kobiniae Murrill 



8. Older pores visible in projecting annual layers, tubes 3-4 to a mm., thin- walled ; 



pileus deeply furrowed, not rimose. P. junipcrinits (Schrenk) Murrill 



Older pores not externally visible, tubes 1-2 to a mm., thicker-walled; surface 



very rimose. P. Earlei Murrill 



9. Cystidia abundant, pointed, dark brown ; pileus thin, rigid, tubes short, 5 to 



a mm. P. conchatus (Pers. ) Murrill 



Cystidia none. 10 



10. Pileus 10-25 ^"1- broad, marked with narrow shallow furrows, margin undulate 



or lobed, pores minute, 8-9 to a mm. P. Langloisii Murrill 



Pileus smaller, deeply sulcate, pores larger, 6 to a mm. ; growing on species of 



JRibes, very rarely on other shrubs. P. Pibis (Schum. ) Murrill 



G. Key to the Species of Nigrofomes 



I. Pileus large, sessile, context purple, tubes black, spores hyaline; found on trunks 

 in Florida. N. melanoporus (Mont.) Murrill 



New York Bot.vnical Garden. 



ADDITIONAL NOTES ON SOUTHERN ILLINOIS 



PLANTS 



By H. a. Gi.eason 



Piniis ccJiiiiata Mill. Since the occurrence of this species in 

 the Pine Hills of Union County was mentioned in this journal,* 



*TORREYA, 3:1. 



