MurriLL: PoLtyporRACEAE OF North AMERICA 341 
Pelloporus Quél. Enchiridion, 166. 1886. 
Mucronoporus Ell. & Ever. Jour. Myc. 5: 28. pl. 8. 18809. 
Onma Karst. Finlands Basidsv. 326. 1889. 
Nanthochrous Pat. Cat. Tun. 51. 1897. 
The genus Coltricia was established by S. F. Gray in 1821 
upon three species, C. connata, C. nummularia and C. leptocephala. 
The first, which is considered the type of the genus, is the Boletus 
perennis of Linnaeus, a well-known plant of wide distribution, 
placed under the genus Polystictus in Saccardo’s Sylloge. The 
other two are typical species of the genus Polyporus in the nar- 
rowest sense. Gray placed them in Coltricia because they had the 
“stem central, cap orbicular, umbilicate, membranaceous,” while 
important differences in structure were disregarded. The genus 
Strilia, based on S. cinnamomea (Jacq.), has no claim to distinction 
and was evidently erected through error or lack of proper material. 
The genus Polystictus, separated as an experiment by Fries in 
1851, is based on Polystictus parvulus, a close ally of P. perennis, 
and must therefore stand as a synonym of Coltricia. 
The genus Pel/oporus included P. perennis, P. tomentosus and 
other allied species with corky or coriaceous context, ferruginous 
substance and spores and terrestrial habits. The first species listed 
is P. trigqueter, a wood-loving form of P. circinatus, in which the 
stipe has become lateral and rudimentary. In a former article 
(Jour, Myc. 8: 95. 1903), P. trigueter was considered more 
nearly related to P. radiatus, which also has a spiny hymenium 
and grows on tree-trunks, and the genus Ped/oporus was there 
treated as a synonym of /zonotus Karst. Since the proper posi- 
tion of P. trigueter is determined Pelloporus must now be con- 
sidered synonymous with Co/tricia. 
The genus Mucronoporus was based on M. circinatus, M. 
dualis, M. tomentosus and nine other species quite different in 
Structure from the three mentioned, but resembling them in having 
4 spiny hymenium, which was the distinguishing feature of the 
§enus. In observing this feature exclusively, a number of other 
Species, as varied an assortment as the family affords, have been 
since added to the original twelve. The genus Ovwia, with the 
Same distinctive character as Mucronoporus, was established later 
in the same year upon Onnia circinata and Onnia tomentosa and 
