112 MurRRILL: POLYPORACEAE OF NORTH AMERICA 
Hampshire (Miss Minns) and New York (Underwood). Klotsch’s 
collections from Scotland are Polyporus fomentarius L. of advanced 
age and indurated. This is the conception of /. migricans at 
Berlin (see Sydow, Myc. Mar. No. 2604). At Kew, F. nigricans 
has been considered “rare the world over.” A tiny specimen 
2X 3 X 2 cm. in the herbarium of Berkeley sent from Upsala 
presumably by Fries himself has the external appearance of F. 
nigricans (see Fries, Icon. f/. 184), but its size would indicate that 
it is Porta levigata Fries, in its pileate form, a state of this fungus 
not known to Fries and easily confused with depauperate forms of 
F. nigricans. The other specimens at Kew are all old hardened 
forms of P. fomentarius L. 
2. Pyropolyporus fulvus (Scop.) 
Boletus fulvus Scop. Fl. Carn. Ed. 2. 2: 469. 1772. 
Polyporus igniarius 6. minor, subperpendicularis Fries, Syst. 1: 
275. toeti 
Polyporus fulvus Fries, Hym. Eur. 559; Icon. p/. 784, f. 3. 
Fomes fulvus Gill. Champ. Fr. 1: 687. 1878. 
Phellinus fulvus Quel. Ench. Fung. 172. 1886. 
Fries at first considered Boletus pomaceus Pers. synonymous 
with B. fulvus Scop., but later decided, and correctly so, that it is 
only a form of P. igmiarius L. In Micheli’s no. 9, p. 119, of his 
genus Agaricum, the two forms are confused, though his figure, 
pl. 61, ordo II, doubtless represents P. fulvus growing on Prunus 
and not P. iguiarius growing on Malus. This confusion still exists 
in European herbaria and it is impossible to determine in them 
what is meant by Polyporus fulvus Fries. In the following descrip- 
tion Scopoli very plainly characterizes the plant under discussion : 
“Totus fulvus ; poris difformibus, non adeo profundis. Habitat 
in cerasis recens detruncatis. Junior integerrimus, adultus vero 
margine sinuatus. Fulvus color in margine et subtus evidentior. 
Poruli obsoleti, totum fungum subtus non semper occupant.” 
Pl. Crypt. France par Desmaziéres no. 5157. ‘Sur les pru- 
niers et les cerisiers.’ Fung. Selec. Exsic. par Roumeguére No. 
6963. ‘‘ Forma Cerasi, sur un vieux cerisier.” Trienti (Bresa- 
dola) on Persica, Eisenach and Thuringen (Underwood) on Pre 
nus, Sweden (Murrill) on Prunus, and on Prunus both wild and 
