CONTEXT AND PORES COLORED. 



hyaline spores are shown by the microscope. Cooke places it in Polystictus, and it 

 is so found in most of our text books. It is out of place in Polystictus. 



Pcrsoon named it Polyporus alneus, and this name, which is most appropriate, 

 should be retained. Persoon cites with doubt Sowerby t. 196, called Boletus radiatus; 

 and Fries, our legal authority, not wishing to use Persoon's name, substituted 

 Sowerby 's name on the sacred principles of priority, on which "sacred principle" one 

 can always rely when he wishes to change the name of the man from whom he gets 

 his information. But Sowerby t. 196 does not represent Polyporus alneus either 

 as to habitat, color, or surface, and is far more probably a figure of Polyporus cuti- 

 cularis. Still we call our plant "Polyporus radiatus Sowerby," and the forms of 

 "Science" are at least duly observed. 



SPECIMENS. Many, from United States and Europe. 

 Compare aureonitens, brunneus, cucullatus, scrobiculatus. 



Forms. 



There occurs rarely in the United States a very thin, yellow form with same 

 setae and spores. We have a specimen from Geo. E. Morris, Massachusetts, on maple. 



Compare Polyporus subradiatus, in Section 95, a similar plant to Polyporus radiatus, but with- 



Fitj. 689. 

 Polyporus nodulosus. 



POLYPORUS NODULOSUS (Fig. 689). While agreeing with Polyporus 

 radiatus in every essential character, and exactly the same under the microscope, this 

 has numerous small, imbricate pilei not inaptly described as "nodules." It grows 

 on beech, and is only a beech form of Polyporus radiatus. 



ILLUSTRATIONS. Fries' Icones, t. 187. It shows the manner of growth, but the color will 

 not do at all. Rostk., t. 56 (as Polyporus polymorphus). Picture is not bad. 



Compare fuscolutescens, polymorphus. 



POLYPORUS DRYADEUS. Pileus sessile, often large, a foot 

 even in diameter, 2-3 inches thick. Surface with a thin but distinct 

 crust, brown. Context medium, soft, reddish brown color (Sudan 

 brown), with a sheen. Pores small, round, subconcolorous, 1-2 cm. 

 long. Setae straight, rare, 8x40 mic. Spores globose, smooth, hya- 

 line or pale colored, 7-8 mic. 



352 



