Murrill: Polyporaceae of North America Z4\ 



Pelloporus Quel. Enchiridion, 166. 1886. 



Mucronoporus Ell. & Ever. Jour. Myc. 5: 28. pi. 8. 1889. 



Onnia Karst. Finlands Basidsv. 326. 1889. 



Xanthochrous Pat. Cat. Tun. 51. 1897. 



The genus Coltricia was established by S. F. Gray in 1821 

 upon three species, C. connata, C. nummutaria 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 5. 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 

 185 1, is based on Polystictus parvulus, a close ally of P. percnnis, 

 and must therefore stand as a synonym of Coltricia. 



The genus Pelloporus 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. triqueter, a wood-loving form of P. circiuatns, in which the 

 stipe has become lateral and rudimentary. In a former article 

 (Jour. Myc. 8 : 95. 1903), P. triquctcr was considered more 

 nearly related to P. radiatus, which also has a spiny hymenium 

 and grows on tree-trunks, and the genus Pelloporus was there 

 treated as a synonym of Inonotus Karst. Since the proper posi- 

 tion of P. triqucter is determined Pelloporus must now be con- 

 sidered synonymous with Coltricia. 



The genus Mucronoporus was based on M. circiuatus, M. 

 dualis, M. tomentosus and nine other species quite different in 

 structure from the three mentioned, but resembling them in having 

 a spiny hymenium, which was the distinguishing feature of the 

 genus. 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 Onnia, with the 

 same distinctive character as Mucronoporus, was established later 

 in the same year upon Onnia circinata and Onnia tovientosa and 



