SPORES HYALINE. 



its pores. At length thin with acute margin, and usually four to six 

 inches in diameter. It is the only abundant, white Polyporus one 

 notes in Sweden. 



Compare Ptychogaster, also Ptychogaster albus, Myc. Notes, Polyporus Issue, page 30. 



Forms. 



POLYPORUS SPATHULATUS.-The common Polyporus borealis is a thin, 

 dimidiate plant, but it has a tendency to form behind a reduced base, or a "short 

 lateral stipe, as Fries notes it. He named this form as above. 



POLYPORUS LAPPONICUS.-This was named by Romell from a single 

 specimen on Abies in Lapland. It is similar to Polyporus borealis, and was so taken 

 by Romell when collected. The spores, oblong, 3-4 x 8-12, are quite different We 

 have seen no specimens. 



B. Pores small, round. 



Fig. 671. 



Polyporus occidentalis. 



POLYPORUS OCCIDENTALIS (Fig. 671). Pileus sessile, 

 white, with soft, fibrillose surface. Context light weight, soft, friable 

 near the surface, firmer below. Pores white, small, 2-3 to mm. 



Quite similar to Polyporus obtusus in the color and soft, light- 

 weight flesh, it differs markedly in having small pores. It is quite a 

 rare plant, and but few collections are at New York Gardens. It 

 occurs on beech. We have only one collection, from S. H. Burnham, 

 New York. 



POLYPORUS PELLES. Pileus dimidiate or from a reduced 

 base. Surface soft, densely hairy, dark brown. Flesh (of dried 

 specimens) hard below, softer above, and resolved into the dense hairy 

 surface; white (probably) when fresh, but discolored, fuliginous in 

 specimen. Pores minute, round. Spores elliptical, 3^4x5^, hyaline. 



Based on a specimen (No. 8) from E. Jarvis, Queensland, Aus- 

 tralia. The soft, hairy surface is comparable to the fur of some 

 animal. The plant is evidently related to Polyporus rufescens (but 



327 



