HISTORY. A rather rare plant I judge, which I know only from the type 

 at Albany and a single collection that I made in northern Canada. It grows 



Fig. 199. 

 rolystic.us dualis. 



only on pine wood and those I found were on the base of a living pine tree. Its 

 evident relationship to Polystictus circinatus has been acknowledged by Profes- 

 sor Peck but it is quite distinct and I do not question its claim to specific rank. 

 It was given as a synonym for Polystictus circinatus by Cooke (who was only 

 guessing) and so compiled by Mr. Murrill. It does not in reality belong in this 

 section for Professor Peck finds it usually sessile, belonging to the Apus section. 

 Although it has little resemblance to Fries' figure and does not agree with his 

 description, I suspect it will prove to be Polystictus triqueter of Europe. Bresa- 

 dola gives Polystictus triqueter and circinatus as varieties of the same species, 

 though Fries does not indicate any relationship and puts them in widely distinct 

 sections of Polyporus. 



PLANTS WITH NO COLORED SETAE. SPORES PALE COLORED. 



There are three frequent, small species belonging to the section Perennes 

 and they have been very badly confused. They are widely different and there is 

 no occasion for this confusion excepting lack of care on the part of the writers. 

 All are much smaller, more slender plants than the preceding and have pale col- 

 ored spores, appearing almost subhyaline under a high power. They are readily 

 distinguished by the following key : 



Color bright cinnamon, Polystictus cinnaniomeus. 



Color dull. Pores large, Polystictus focicola. 



Color dull. Pores small, Polystictus perennis. 



CINNAMOMEUS (Fig. 200) Pileus thin, 

 or umbilicate, bright, ferruginous-cinnamon 



POLYSTICTUS 

 coriaceous, depressed 



color, subzonate, the surface silky and shiny with appressed radiating 

 fibrils. Context thin, concolorous, ^ rnm. thick. Stem central, slen- 

 der, equal, concolorous. Pores small, concolorous, at first shallow but 

 when mature 2 to 2)^ mm. long. Spores elliptical, smooth, varying 

 from 5x6 to 6xio mic., pale straw color, pale under the microscope. 



HISTORY. This is not a rare plant in the United States, and is usually 

 found in rich humus in the woods. In Europe it is very rare. It is small and 

 slender, the pileus from i^ to 4 cm. in diameter. Many of the collections are 



