440 BANKER: HISTORICAL REVIEW OF 
9. Puiesia Fr. Syst. Myc. 1: 426, 1821 
The genus was founded on Merulius merismoides Fr. with three 
other species. 
1o. Raputum Fr. Syst. Orb. Veg. 81. 1825 
This genus was established on Hyduum pendulum (= Sisto- 
trema pendulum Alb. & Schw.) with three other species. That the 
species, simply named as Hyduum pendulum by Fries, in this in- 
stance is really Szstotrema pendulum of Albertini and Schweinitz 
is made unquestionably evident by a comparison of the text in 
Systema Orbis Vegetabilis, $1, with the text in the Conspectus 
Fungorum, 261. Fries himself always cites the Elenchus Fungo- 
rum, 149. 1828, as the place where he established the genus. 
But this must be regarded as a different genus having the same 
name, for, curiously enough, in the latter work, he describes a 
totally different species and evidently a new one under the name 
of pendulum. Cf. Irpex below. 
The name Radulum, however, is untenable, being excluded by 
Radula, established as a genus of the Jungermaniaceae, by 
Dumortier in Comment. Bot. Obs. 112. 1822.* I propose, there- 
fore, for the name of this genus Tylodon + based on T. Friesii (= 
Radulum pendulum Fries, Elenchus Fungorum, 149. 1828; not 
Radulum pendulum Fries, Syst. Orb. Veg. 81. 1825.) 
11. Irpex Fr, Elench, Fung. 142. 1828 
This genus was first published by Fries in Syst. Orb. Veg. 
81. 1825; but without naming any species. In the Elenchus, 
142, ten species are mentioned under /rpex, 1. pendulus standing 
first. This species is clearly our old friend of the Radu/um dis- 
cussion, Sistotrema pendulum Alb. & Schw., as may be seen by 4 
comparison of Elench. Fung. 142, with Syst. Myc. 1: 413- 
more curious confusing of names it would seem could hardly be 
found in the work of a great systematist. 
The genus stands on the border line between the Hydnaceaé 
and the Polyporaceae and is thrown now to the one side and now 
to the other by the varying judgment of mycologists. 
* Of. M. A. Howe, Hepaticae and ‘Anthocerotes of California, Mem. T 
Club, 7: 157, note. 
{ From riAy, a knot or callus, and ddotc. 
