May 1903] Review of Ge?iera of Poly for aceae 
89 
by Humboldt, the genus name referring to its branched appear¬ 
ance. The normal form, common in Europe, was probably un¬ 
known to Humboldt at this time since it is not listed in his work. 
13. Xylometron Paulet, Icon. Champ, pi. 3. f. 1-4. 1793. 
—Based on X. lobatum and two other species, none of which are 
determinate. 
14. Pyreium Paul. Icon. Champ, pi. 5. f. 1-3. 1793.— 
Based on P. giganteum Paul. [Xylostroma giganteum (Paul.) 
Tode] and some doubtful species of the Polyporacese. Since the 
first species is determinate, it stands as the type. 
15. Polyporus (Mich.) Paul. Icon. Champ, pi. 13. 1793. 
— The genus Polyporus as established by Micheli in Nov. PI. 
Gen. 129. pi. 70-71. 1729, was such a natural division and so 
clearly distinguished that it remained intact for over a century. 
Its nomenclatorial type was P. leptocephalus (Jacq.) Fr. and as¬ 
sociated with this species were some of the most common and 
well known members of the family. Unfortunately, however, 
Linnseus retained the name Boletus for all pore-bearing fungi 
and those mycologists who adopted Micheli’s genus failed to es¬ 
tablish it according to modern ideas. Adansofi, for example, only 
cited Micheli’s figures and listed no properly named species, Hal¬ 
ler used polynomials, and Scopoli in his introduction listed no 
species at all under Polyporus. It is not until the publication of 
Paulet’s work in 1793 that the genus is securely established. 
This work, written twenty or more years before its publication, 
contains descriptions and figures of six species of Polyporus; P. 
ulmi, P. frondosus, P. umbilicatus, P. carbonarius, P. fasciatus 
and P. tuberaster, four of which belong to Micheli’s genus in the 
strictest sense. The first species, P. ulmi, is the very common 
and well known P. squamosus (Huds.), synonymous with P. cau- 
dicinus (Scop.), and must be considered the nomenclatorial type 
of Polyporus according to principles now in vogue. The general 
use of Polyporus instead of Boletus is due to Fries, who, know¬ 
ing nothing of Paulet’s work, “restored” the name in 1815 and 
popularized it in spite of the influence of Linnseus. 
16. Scutiger Paul. Icon. Champ, pi. 31. f. 1-3. 1793.— 
Based on S. tuberosus Paul, and a few other species which are 
now placed in different genera. 
17. Poria Pers. Neues Mag. Bot. 1:109. I 794 -—Based 
on P. medulla-panis (Jacq.) and two other species now consid¬ 
ered generically distinct. See Poria of Adanson. 
18. Mucilago Hoffm. Bot. Taschenb. pi. 12. f. 2. 1795. 
— Preoccupied by Mucilago Scop, belonging to another family 
of plants. Synonymous with Xylophagus Link. 
19. Daedalea Pers. Syn. Fung. 499. 1801.— Founded 
on D. quercina (L.) and four other species. Before listing 
these species, Persoon quotes Battarra at some length and iden¬ 
tifies most of the figures on his pi. 38. No mention is made of 
