MURRILL : POLYPORACEAE OF NORTH AMERICA 423 



This genus is based upon Boletus pavonius Hook. (Kunth, 

 Syn. PL I : 10. 1822), described from Colombia. Its nearest ally 

 is the old-world genus Cyclomyces, erected by Fries in 1830 upon 

 Cyclomyces fuscus. In this latter genus the tubes are continuous 

 concentric furrows, while in the species of Cyclomycetella which 

 come nearest to Cyclomyces the concentric appearance of the 

 hymenium is caused by the partial splitting of the radial walls in 

 age ; and the formation of furrows is by no means constant. 



Cyclomycetella pavonia (Hook.). 

 Boletus pavonius Hook, in Kunth, Syn. PI. I : 10. 1822. 

 Polyporus pavonius Fr. Epicr. 477. 1 836-1 838. 

 Polyporus iodinus Mont. Ann. Sci. Nat. II. Bot. 16: 108. 1841. 



The type plants of Hooker's species were collected by Hum- 

 boldt in Colombia, or New Granada as it was then called, and 

 named for Ulva pavonia because of the concentric lines of the 

 pileus. Montagne's types were from Guiana, collected by Lepri- 

 eur. He first thought that these plants were P. striatus (Hook.), 

 but later placed them midway between this species and P. taba- 

 ciuus Mont., making no mention of Hooker's other species, P. 

 pavonius, described just before. 



Other closely related species are found in South America. B. 

 striatus Hook. (Kunth, Syn. PI. I : II. 1822), was described from 

 plants collected by Humboldt in Peru, and has since been found 

 in Venezuela. P. vespilloneus Berk. (Hook. Jour. 8: 1856) was 

 described from Juan Fernandez Island and later reported by Mon- 

 tagne from Chile. All these species show very recent common 

 origin. P. Hasskarlii, a Ceylon species, has several times been 

 erroneously reported from Cuba. 



Cycloporus gen. nov. 



Hymenophore annual, tough, anoderm, terrestrial, orbicular, 

 centrally stipitate ; context soft, spongy, ferruginous ; pores at first 

 polygonal, soon becoming continuous concentric furrows, dissepi- 

 ments thin, lamelloid ; spores ovoid, smooth, ferruginous. 



The type of this genus is Cyclomyces Greenei Berk. (Lond. 

 Journ. Bot. 4: 306. pi. 11. 1845), a very rare plant found in 

 temperate regions of North America. The genus Cycloporus dif- 

 fers widely from Cyclomyces in being terrestrial and stipitate instead 

 of epixylous and sessile. 



