CONTEXT AND PORES WHITE OR PALE. 



and watery, as are most species in this section. We take Polyporus 

 albidus in the sense of Bresadola, who seems to take it in the sense of 

 Schroeter, who says he takes it in the sense of Trog. It is not in the 

 sense of Fries I judge from the description, but the picture Schaeffer 

 t. 124, which Fries cites as good, seems to be the plant. We have a 

 number of collections of Polyporus albidus from Europe, but few from 

 the United States, where it is mostly southern. 



I have seen many French determinations of this plant as Poly- 

 porus stipticus (surely not Persoon), and it is Polyporus palustris for 

 Mr. Murrill (not Berkeley). 



ILLUSTRATION'S. Schaeffer 124 seems to be the plant, although most of the specimens are 

 too thin. 



SPECIMENS. A number, from Europe mostly. New York, S. H. Burnham; Louisiana, 

 E. Bartholomew. 



Compare anceps, palustris. 



POLYPORUS MARIANI (bis). Pileus dimidiate, imbricate, with a dull, 

 white surface. Flesh white, hard. Pores white, medium, round, or elongated. 

 Spores (B) 2-2 K x 5-8. 



This is a white species, described from specimens on the live oak in Italy. It 

 is only known from the originals. It appears to us very close to Polyporus albidus 

 except as to host. The entire plant remains white in drying. 



ILLUSTRATIONS. Gior. Bot. Ital., vol. 7, t. 11. 

 SPECIMENS. Cotype from Rev. Bresadola. 



Fig. 641. Fig. 642. 



Polyporus spumeus. Fig. 641 surface fibrils (X6). Fig. 642, pores (X6). 



POLYPORUS SPUMEUS. Pileus pure white, discoloring in 

 drying. Surface (Fig. 641) floccose, with loose, incised fibrils. Flesh 

 pure white. When growing, soft, but becoming hard and discolored 

 in drying. Pores (Fig. 642) small, round, with uneven edges, white, 



304 



