REVISION OF THE Хоктн AMERICAN HYDNACEAE 105 
brittle when fresh; teeth pale yellowish or reddish, often white 
when young, terete or flattened; spores white or yellowish, ob- 
long, ovoid or subglobose, often more or less angular, usually 
smooth, often apiculate, generally with one or more small guttulae. 
Hydnum repandum is probably the oldest and most commonly 
known, as well as the most widely spread, species of the family. 
It is altogether probable that it is the plant referred to by Bauhin, 
Historiae Plantarum Universalis 3: 828. 1651. It is also un- 
doubtedly the plant figured and described by Dillenius, Catalogus 
Plantarum circa Gissam nascentium, 188, M. Г. 1719, upon 
which he founded the genus Avinaceus, the prototype of Hydnum. 
When, in 1753, Linnaeus adopted his binomial system of nomen- 
clature, this species, although not placed first in his list, repre- 
sents the nomenclatorial type of his genus Hydnum, according to 
the interpretation of the principle of generic types by the code here 
followed 
Hypothele Paulet was the first genus actually carved out of the 
Linnaean Hydnum, but was founded on the same type, А. repan- 
dum L. Paulet's original work* does not appear to have had a very 
wide distribution or to have been’ very generally known ; not until 
after its republication by Leveille in 1855 do we find the European 
mycologists apparently acquainted with it. In 1821 S. Е. Gray, 
in his Natural Arrangement of British Plants 1: 650, evidently 
unaware of the work of Paulet, founded the genus Dentinum оп 
Н. repandum L. апа H. rufescens Pers., making an exact dupli- 
cate of Hypothele Paulet. Gray’s work, following as it did the 
natural system of Jussieu, did not meet with an enthusiastic recep- 
tion by his fellow-countrymen, and thus failed to receive the recog- 
nition and circulation that it deserved, so that as late as 1881 
Karsten, in the Revue Mycologique 3': 19, apparently ignorant 
of the work both of Paulet and of Gray, separated the species- 
H. тералаит L. апа Н. rufescens Pers. again as a genus and gave 
to it the name Zyrodoz. The plants thus distingished stand in 
marked contrast with other members of the family and seem to 
fully justify the opinion of these three eminent botanists who so 
` * The text of Paulet’s Icones des Champignons was oe in 1793 but does not 
contain a reference to H/yfothele. This name appears only on the plate cited. Тһе 
plates were issued later than the text in a series of ала Bk last twelve of which 
appeared after Paulet’s death, which occurred in 1826. 
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