47<) MURRILL I POLYPORACEAE OF NORTH AMERICA 



" Pilous 2-3 inches broad, I A inch long, dimidiate or reniform, 

 and elongated behind, convex uneven, milk-white, clothed with 

 strigose down of a soft, fleshy substance, zoned within and con- 

 sisting of radiating fibers. 



" Hymenium flat, or slightly concave. Pores yi^ of an inch 

 broad, scarcely visible to the naked eye, but giving to the 

 hymenium a silky lustre, white ; dissepiments very thin, slightly 

 uneven. 



"Nearly allied to Pol. undulatus Schwein, and Pol. symphyton 

 Schwein. The dried specimens are rigid, and sometimes have the 

 margin dark brown." 



This species was determined by Cooke as P. borealis and is 

 usually seen under that name in collections. It may be dis- 

 tinguished by its smaller tubes, its less fibrous context and its 

 habit of growing on deciduous instead of coniferous trees. One 

 of its favorite hosts is the apple-tree, on which it has several times 

 been found in New York and Connecticut, growing inside par- 

 tially decayed trunks or emerging from knot-holes in living trees. 

 When fresh it is pure white or watery white and so full of water 

 that this may be squeezed out as from a sponge. On drying, it 

 usually assumes a sordid tint, especially near the margin. 



Specimens are at hand from Canada, Dearness ; Massachusetts, 

 Underwood ; Connecticut, Earle, Miss White ; New York, Under- 

 wood, Parle, Stewart, Peek, Banker ; Delaware, Commons ; Ohio, 



Morgan, Lloyd. 



Species inquirendae 



Boletus undulatus Schw. Syn. Fung. Car. 70. 1818. Poly- 

 poms undulatus Fr. Elench. Fung. 87. 1828. Described by 

 Schweinitz from Carolina as follows : 



" B. major subimbricatus spongiosus lutescens, pileo undulato 

 hirto margine zonato, poris minutis candidis. Elegans fungus ad 

 truncos rarius occurrit, in longitudinem expansus, interdum fere 

 substipitatus, aetate indurescens. Pileus basi incrassatus, strigoso 

 hirtus, margine substrigosus." 



Fries makes the following comments on this species in the 

 Elenchus : 



" Major in longitudinem extensus, interdum postice porrectus, 

 junior spongiosus, aetate indurescens. Pilei basi incrassati, strigoso- 

 hirti ex Auctore, sed in meo Specimine tantum rugosi et quoad 

 colorcm fumosi. Pori minuti, obtusi, integri, in meo specimine 

 sordidi. Caro crassa, fibrosa, subzonata, albida. Mihi P. fumoso 

 proximus visus indeque hoc loco collocatus." 



