No. 18. V. d. Lek, Persoon’s types of Polyporus [1913.] 5 
PersooN. In the Mycologia Europaea (pag. 90) PerRSOON gives a 
deseription of this species under the group „Poria.” 
The specimens found under this name in PersOON’s herbarium 
are exclusively resupinate forms, and in my opinion the well-pre- 
served specimens are only forms of Fomes conchatus. This seems 
to be also BRESADOLA’s opinion, to judge from his notes added to 
some specimens collected by me in Holland.t) To one of them Bre- 
SADOLA ?) gave this note: 
— Fomes salicinus Pers. 1791. 
Fomes conchatus Pers. 1796. 
— Fomes loricatus Pers. 1825. 
— Fomes salicinus et conchatus FR. 
We may however remark, that this opinion does not agree with 
Fries, Hym. Eur. p. 560 (Ed. Alt): 
„Polyporus conchatus ……. variat totus resupinatus, qualis a P. 
salicino probe distinguendus” and „Polyporus salicinus …… Hic a 
praeeedentibus distinctissimus, P. fomentario 1. ignario affinis, 
crusta ebenea.” 
IL think therefore, that it is rather doubtful, whether Fries and 
PERSOON meant the same thing by Polyporus salicinus. Fries?) does 
not mention Persoon; he only says: „Hujus loci videtur P. plicatus 
Pers. Myce. Eur. 2 p. 212 (var. pilei margine striato-plicato) et Poly- 
porus loricatus p. Pers. Myce. Eur. 2 p. 87.” 
Yet we find in Fries’ Icones select. Hym. (p. 84): „Polyporus 
salicinus (Pers.) Fr. Syst. Myce. 1 376. Epier. ed II p. 560.” For me 
tbese illustrations are those of resupinate forms of Fomes conchatus. 
It appears to me that this species needs to be observed more 
exactly in nature, especially the variations shown under the in- 
fluence of different conditions (host, direction of the substrate etc): 
as well as the alterations shown during the life time of individual 
plants. 
Fomes Evonymi see Homes scoriatus. 
Fomes fomentarius. 
Under this name we find in boxes 415 and 417 two great speci- 
mens, both attributed to Persoon, though neither labelled by him. 
1) See plate and explanation. 
2) See also BRESADOLA, Hym. Hung. Kmet. p. 11: 
„Fomes salicinus Pers. in Gmeu. Syst. Nat. II p. 1473 (1791) sub Boleto! Boletus 
conchatus Pers. Obs. I, p. 24 (1796)! Polyporus conchatus et salicinus FR. „Speci- 
mina authentica, persooniana tam Foruti salicini quam Fomiti conchati vidi, at 
tantum formas plus minus resupinatus unius speciei sistunt” 
3) Hym. Eur. Ed. Alt. p. 561. 
