CONTEXT WHITE OR PALE. PORES COLORED. 



with different spores), and a better knowledge of it may transfer it to 

 Section 33 of stipitate species. The type specimen, however, is only 

 reduced at the base. The flesh next to the pores is hard and firm, but 

 is softer above. 



SECOND GENERAL DIVISION. 



CONTEXT WHITE OR PALE. PORES COLORED. SPORES 

 HYALINE. 



\Ve divide this division into three sections: 



Thin plants, pileus less than a cm. thick Section 88. 



Thick plants, ungulate 89. 



Thin plants, with gelatinous pores. (Gloeoporus in part) . . 90. 



SECTION 88. THIN PLANTS, LESS THAN A CM. THICK. 



POLYPORUS ADUSTUS. Pileus thin, dimidiate, imbricate, 

 often largely decurrent. Surface finely tomentose, isabelline. Flesh 

 white, slightly discolored when dry, thin, 3-5 mm. Pores dark adustus 

 or fuliginous, small, round. Spores allantoid, 1-1^ x 5. 



We have here a most abundant species throughout the United 

 States and Europe, on frondose wood. Around Cincinnati it favors 

 the beech, but it has no especial affinity to the host. The imbricate 

 pilei often cover many feet on the side of logs or extend for many 

 feet over the trunks of standing, dead trees. Polyporus adustus is 

 often confused with Polyporus fumosus. In adustus the pores are 

 dark in the growing plant. In fumosus they are white, but turn dark 

 as the plant dries. Besides, the spores are different. Still, we often 

 have collections of dried Polyporus fumosus which are difficult to tell 

 from Polyporus adustus, and in the museums many specimens of 

 Polyporus adustus are labeled as being Polyporus fumosus. 



There is not much variation of Polyporus adustus as it occurs in 

 Europe and the United States. Yellowish specimens have been called 

 Polyporus carpineus. Sometimes Polyporus adustus develops a 

 fragrant odor. Then it is apt to be called Polyporus fragrans, but not 

 correctly, for Polyporus fragrans is a form of Polyporus fumosus. 

 Polyporus adustus in its various forms is of world-wide distribution. 

 These foreign plants have received many names, as recorded in our 

 synonyms. The following two are all we have noted that seem to us 

 worthy of a separate name. 



ILLUSTRATIONS. Bulliard, 501 (as pelleporus), rather dark. Sowerby, 231 (as carpineus) 

 pores are right but color of pileus never as "fawn" as this. Gillet, good. 



SPECIMENS. Abundant from Europe and America. We have specimens also from Argentine 

 Ceylon, Japan, India, Madagascar (?). It appears to be frequent in Japan. 



Compare Burtii, carpineus, Curreyanus, digitalis, dissectus, dissitus, fusco-cinereus, Halesiae, 

 Karstenii, Lindheimerii, MacOwani, scanicus, simulans, strumosus, subcinereus, tristis. 



328 



