438 BANKER: HISTORICAL REVIEW OF 
As this paper is not intended to be a criticism of nomenclature 
it is not necessary to present further rules or to discuss the details 
of this subject. Therefore, with these principles as a guide, we 
will examine the genera which have been proposed in this family. 
¥, fiyonum L. Sp. PL 1178. 1753 
The genus was founded on four species, namely 7. imbricatum, 
repandum, tomentosum, and Auriscalpium in the order named. It 
is to be observed that all these species, the only members of the 
family known to Linnaeus, are stipitate forms. The form /Hydna 
was first used. In Flora Lapponica, 368, 1737, Linnaeus published 
the genus Hydna with two species which, from the descriptions 
there given and from his own citations in Sp. Pl. 2: 1178. 1753, ate 
clearly H. imbricatum and H. Auriscalpium respectively. In Genera 
Plantarum, 327, also published in 1737, he publishes the genus 
ffydna without naming any species but cites “ Erinaceus Dill.” 
Now Dillenius, Catalogus Plantarum circa Gissam nascentium 
188, #/. r. 1719, figures and describes but one species which is evi- 
dently 7. repandum. Linnaeus also clearly so understood it, for in 
Sp. Pl.2: 1178 under H. repandumt he cites ‘‘ Flora Suecica, 1098,” 
and in the last-named reference he cites again “‘ Dill. giss. 188.” 
It may therefore be considered an open question whether we are to 
regard 7. imbricatum or H. repandum as the species with which the 
generic name is to be permanently associated, that is, to constitute 
the so-called ‘‘ type.” The technical decision must turn upon the 
determination whether the “Flora Lapponica”’ or the “ Genera 
Plantarum” both of which bear the date 1737, was published first 
But this is a laborious quibbling over trifles. Linnaeus originate 
the genus himself, and it is evident from his lists that /7. imbrica- 
tum ever stood foremost in his mind as the leading representative 
of his genus. In his Systema Naturae, 32. 1740, he changed 
the form of the name to Hyduum. Therefore the generic name 
Hydnum belongs permanently to H. imbricatum and becomes the 
proper name of the genus to which that species is referred. 
2. SISTOTREMA Pers. Neues Mag. fiir die Bot. 1: 108. 1794 
he 
The genus was founded on S. confluens Pers. (= Hydnum su 
lamellosum Bull.) and S. cinereum Pers. 
