228 



MYCOLOGY 



species are not given space in this book. It should be stated, however, 

 that Murrill classifies his genera and species differently from the authors 

 that have preceded him where many of the new genera were classified 

 under the geneia. Polyporus and Boletus (Fig. 90). The arrangement 

 of Murrill seems to be a more satisfactory presentation of these groups 

 than those systems which have gone before and is founded on more 

 natural characters. The nomenclature which this author adopts in 

 the several recommended manuals was foreshadowed in vol. 9, part i 



Fig. 90. — Boletus felleus in three stages of development. (After Patterson, Flora IV, . 

 and Charles, Vera K., Bull. 175, U. S. Dept. Agric, pi. xxxi, Apr. 29, 1915.) 



(1907), and part 2 (1908) of the "North American Flora," where keys 

 will also be found with the synonymy which hjis been omitted from the 

 manuals. To connect satisfactorily, the old and the new generic and 

 specific names, the treatment of the Polyporace^ in the "North 

 American Flora" should be consulted. 



Trametes robiniophila is found on decayed spots of living trunks of 

 Rohinia pseudacacia from Pennsylvania to Virginia and Missouri, and 

 it doubtless causes decay of the wood. T. suaveoleus is found on willow 

 trees, where it causes serious decay. It has an agreeable odor. T. 



