L. ROMELL, HYMENOMYCETES OF LAPPLAND. 15 
In Lappland this species occurs not only in the common 
ungulate form but also quite frequently in a more or less resupi- 
nate state. — Cf. Pol. laevigatus, pag. 16. 
That this species, at least the ungulate form, is Boletus 
igniarius of LINNÉ seems to be beyond a doubt. The plant is 
quite common in Lappland as in other parts of the country, 
and LINNÉ described it already in his Flora lapponica, though 
he there seems to have included also Pol. fomentarius, which 
was separated, however, in Flora suecica. (In the second edi- 
tion of the latter work the description of Hydnum imbricatum 
has, from wrong imposition, been placed under Boletus igniarius.) 
— BoOUDIER'S Pol. nigricans (t. 98) belongs here, and the form 
on Betula is KARSTEN'S Pol. nigricans. Also FRIES” original 
Pol. nigricans in Syst. Myc. I p. 375 is the Betula-form of Polyp. 
igniarius (»Ad truncos Betulae, nec alibi»). I have myself 
collected it at Femsjö, Stockholm, Upsala etc., and it is quite 
identical with the lapponian plant. Though the specimens 
on Betula, at least of the ungulate form, seem often to have a 
trifle larger spores than those on Salix, I should not consider 
it convenient to separate them as a distinct species as it seems 
to be quite impossible to trace any constant difference in other 
respects. — The Klotzschian plant from Scotland cited by 
Fries in Hym. Eur. pag. 558 is, according to the specimen in 
Berlin, only the old, blackened state of Polyp. fomentarius, 
which has nothing to do with Pol. igniarius. 
P. lacteus. 
On rotten log of Betula at Björkliden. 
Pileus under the lens roughly or reticularly tomentose at 
least behind, towards the margin more evenly pubescent, at 
last becoming glabrous. Spores allantoid, 31/,—5x1!/, wv. 
Hyphae intricate, very ramose, 3—9 u broad. 
This species seems to be identical with one known in Ame- 
rica as Polyporus chioneus. Whether P. chioneus of FRIES is 
really the same plant I do not know. My specimens agree 
with the authentic Pol. lacteus at Kew. In FRIES” herbarium 
neither P. lacteus nor P. chioneus is represented by authentic 
specimens, as far as I know. There is, however, a collection from 
hymenial spines but the form and size and color etc. of the plant which distin- 
guishes Polyp. pomaceus PERS. from Pol. igniarius. 
