GENERA OF HyDNACEAE . 4389. 
3. Hericium Pers. Neues Mag. fiir die Bot. 1: 109. 1794 
This genus was established on Hydnum coralloides Schaef., a 
single species and is not Hericium of Fries, g. v. 
4. Opontra Pers. Neues Mag. fiir die Bot. 1: 110. 1794 
This genus was established on O. ferruginea Pers. and O. nivea 
Pers. and is not the Odontia of Fries, g. v. 
5. Xytopon S. F. Gray, Nat. Arr. Brit. Pl. 1: 649. 1821 
This name was first given to a subgenus of Sistotrema by Per- 
soon in Syn. Fung. 552. 1801. It included Odontia quercina Pers. 
and six other species. Gray made it a genus of his family of the 
Sistotremideae with the species Sistotrema quercina Pers. and S. 
digitatum Pers. It has since been treated, when recognized, as a 
genus of the Polyporaceae, where it presumably belongs. It has 
| been included here only to make the historical discussion of the 
) family complete. 
| 6. Dentinum S. F. Gray, Nat. Arr. Brit. Pl. 1: 650. 1821 
The genus was founded on Hydnum repandum L. and H. rufes- 
cens Pers, 
7. Auriscatpium S, F. Gray, Nat. Arr. Brit. Pl. 1: 650. 1821 
The genus was based on Hydnum Auriscalpium L., a single 
species. 
8. Sreccuertnum S. F. Gray, Nat. Arr. Brit. Pl. 1: 651. 1821 
This genus was established on Hyduum Daviesii Sow. (= H. 
ochraceum Pers.*), 7. gelatinosum Pers. and S. guercinum Gray (= 
Hydnum erinaceus Bull.). In his Key, on page 597, Gray uses the 
form Stecherina but, as he quotes Micheli for the source of the 
name, it is evident that the form used in the text is the correct 
one, 
* Gray quotes Hydnum ochraceum Pers. as a synonym. //. Daviesti was figured 
and named by Sowerby in Eng. Fungi, 15. 1797. The same species was described 
under the name of 7. ochraceum by Persoon in Obs. Myc. 1: 73. 1796, and he quotes as 
reference «Gmel, Syst. Nat. Linn. 2: 1440.’ The copy of Gmelin in the Library of 
the New York Botanical Garden is dated 1796 and on page 1440 is given ‘‘ 1. ochra- 
ceum Pers.’’ but without any reference, the preceding species, however, is given as 
“Hf. mucidum Persoon fung. ined.’ It is evident, therefore, that 1. ochraceum Pers. 
ted first published in Gmelin , Syst. Nat. Linn. 2: 1440, at least as early as 1796, but 
: tzel’s Thesaurus gives 1791, as the date of Gmel. 2. In this case, however, this 
difference in date is not important as even the later establishes Persoon’s priority. It 
would be a matter of interest to know the ground of Pritzel’s earlier date. 
