420 Mukrill: Polyporaceae of North America 



PYCNOPORUS Karst. Rev. Myc. 3: 18. 1881 

 This genus was founded upon a single species, Pyaioporus cin- 

 nabarinus (Jacq.), and characterized by its author as follows: 

 " Pileus suberosus, intus floccosus. Pori sat firmi." In North 

 America there are two species of the genus, both of them very 

 attractive, abundant and well known. One occurs chiefly in tem- 

 perate regions and the other is extremely common in the tropics. 

 In the southern United States the two approach quite near each 

 other in some of their forms so that it is not easy to distinguish 



them. 



Synopsis of the >»ortli American species 



Pileus thick smooth, opaque ; plant abundant in temperate regions. 



1. P. cinnabarinus . 

 Pileus thin, often zonate, brilliant red ; plant abundant in the tropics. 



2. P. sanguineus. 



i. Pvcnoporus cinnabarinus (Jacq.) Karst. Rev. Myc. 



3: 18. 1 88 1 

 Boletus cinnabarinus Jacq. Fl. Austr. 4: 2. pi. 304. 1776. 

 Boletus coccineus Bull. Herb. France, 364. pi. §01. f. 1. 1791 . 

 Poly poms cinnabarinus Fr. Syst. Myc. 1: 371. 1821. 

 Trametes cinnabarina Fr. Nov. Symb. 98. 185 1. 



This species was known for some time in Europe before re- 

 ceiving the name assigned to it by Jacquin. The type specimens 

 were sent from Carinthia by Wulfen, and Jacquin states that it is 

 parasitic on trees in subalpine districts of Austria. It is now 

 known to occur on various deciduous trees in Europe, Asia and 

 North America. Bulliard's fine figures were made from plants 

 growing on cultivated cherry. Fries assigned it to his new genus 

 Trametes in 185 1 and Saccardo has listed it under two genera in 

 his Sylloge. Its nearest ally is P. sanguineus, a tropical species, 

 from which it differs in being thicker, more opaque in color, ano- 

 derm, and in having larger tubes with thicker dissepiments. There 

 is also no zonate form of P. cinnabarinus. 



The sporophores appear in this latitude in the latter part of 

 June and mature quickly. In the earlier stages they are very 

 soft, spongy and elastic, light orange in color and clothed with 

 numerous slender delicate hairs which give them a pruinose ap- 

 pearance. Later the hairs disappear, the color becomes darker 



