30 ARKIV FOR BOTANIK. BAND Il. w:o 3. 
appears rather dubious in this instance. And this not only from 
the recedent description in FRIES” works but also from the syno- 
nyms given by him, especially the citation of Xylomyzon pulch- 
rum PERS. Myc. Eur. t. 14. f. 1—2 which does not at all belong 
here but is quite identical with Pol. haematodus RostxK. (Polyp. 
incarnatus KARST.). On the authority of this citation, the 
said Pol. haematodus was in fact considered as »Merul. molluscus 
FR.» by BERKELEY and others, and is so interpreted to this very 
day, I think, by many English and American mycologists. 
Another obstacle is the statement of a variety »pileo bre- 
viter reflexo», which I have never seen', and the comparison 
with Mer. corium, with which my plant has no resemblance. 
There exists no authentic specimen of Mer. molluscus FR. 
as far as I know. But authentic specimens of Merulius fugax 
Fr. both in Upsala and in Christiania seem to be the present 
plant. An authentic specimen of Merul. porinoides in Kew is 
also identical with it. It should be investigated, however, 
what that Merulius porinoides really is which FRIES in a manu- 
script still existing states as growing on a certain place at Femsj6 
while in the same manuscript he states, that Mer. molluscus 
is frequent at Femsjó. I tried to solve the problem last winter 
but could not find any other Merulius on the place cited than 
Mer. serpens. The low part of that place was, however, cove- 
red with ice and snow and thus was not accessible. Mer. mollus- 
cus as here understood I found in Femsjö on two places at least. 
The present plant is described by BERKELEY under the 
name Mer. laeticolor, and a specimen received from The United 
States named Mer. subaurantiacus appears to be the same. — 
Merul. aureus Fr. (see my Fungi Exs. No. 119), which is iden- 
tical with Xylomyzon croceum PERS., has some resemblance 
also, but is easily distinguished by its thick obtuse (not cob- 
webby) margin and by its slender, suballantoid spores (4—5 x 
11/,—2^). 
M. serpens. — Fig. 17. 
On rotten trunks of Betula and Sorbus at Stordalen, Torne- 
trásk and Bergfors. 
Spores hyaline, ellipsoidal, 2-guttate, 4—5X2—2!, w. 
Basidia 15—20 x4—4'/,w. Hyphae 2—3 y. broad, fibulate. 
! Since this was written I have seen such a variety at Bygget in 
Halland. 
