416 Murrill: Polyporaceae of North America 



Synopsis of tlie North American species 



1. Ilymenium concolorous, pileus smooth, entirely devoid of zones or furrows, context 



soft and friable, spores 2.5 X 3-5 ,"• '■ IL rutilans - 



Hymenium differently colored, pileus rarely smooth, context rigid or corky, not 



friable. 2 - 



2. Hymenium lilac-colored, lubes I cm. or more in length, pileus concentrically sul- 



cata 2. //. sublilacinus. 



Hymenium dark brown, tubes less than 0.5 cm. in length, pileus smooth or zonate. 3. 



3. Context rigid, pileus azonate or with few and indefinite markings. 4- 

 Context flexible, pileus plainly and definitely multizonate. 3. H. li<noit/es. 



4. Context bright ferruginous, hymenium fulvous to fuliginous, spores elongated, 



6X2//. 4- H. gilvus. 



Context pallid, hymenium subfulvous. spores subglobose to ovoid, 3-4,// in diameter. 



5. II. fulvitimtus. 

 Context brown, hymenium brownish-gray, pileus reddish-brown, finelyhispid behind, 



spores ovoid, 3 X 3-5 »■ 6 - H - his P idlll " s - 



i. Hapalopilus rutilans (Pers.) 

 Boletus suberosus Bull. Herb. France, 11: 354. pi. 482. 1791. 



Not B. suberosus L. Sp. PI. 1 176. 1753. 

 Boletus rutilans Pers. Icon, et Descrip. 18. pi. f. 4. 1 798-1 900. 

 Polyporus nidulans Fr. Syst. Myc. I : 362. 182 1. 

 Polyporus rutilans Fr. Syst. Myc. 1 : 363. 1821. 

 Hapalopilus nidulans Karst. Rev. Myc. 3:18. 188 1. 

 Inonotus nidulans Karst. Finlands Basidsv. 332. 1889. 



This species seems to have been described independently under 

 different names by both Bulliard and Persoon, though the name 

 assigned by the former had been previously used by Linnaeus. 

 When Fries studied the plant he gave it the name P. nidulans, 

 following it with Persoon's P. rutilans, which, he naively remarked, 

 was perhaps a variety of P. nidulans. The two species were kept 

 distinct by Berkeley, but he had little and poor material and evi- 

 dently did not know them very intimately. 



The plant appears to grow on most deciduous wood, being 

 found on birch, dogwood, hazelnut, hickory, oak and other decid- 

 uous trees, with a preference in this country, perhaps, for hickory. 

 Collections are at hand from Paris, Patouillard ; Connecticut, 

 Undenvood, Parle, White; Pennsylvania, Ran, Stevenson; New- 

 York, Underwood; Kansas, Cragin ; Iowa, Macbride ; Greenland, 

 Rostrup ; Austria, Brcsadola. 



