28 ARKIV FÖR BOTANIK. BAND Il. N:o 3. 
On bark of Abies. Though this species has hitherto been 
found only at Umeå (by J. VLEUGEL) I insert it here because 
its occurence also in Lappland proper seems not improbable. 
M. himantioides — Fig. 19. 
Though I did not find this species in Lappland I do not 
doubt that it occurs there also as it grew abundantly at Laka- 
träsk and Selsjön. 
Spore powder umber. Spores umber-yellow, ellipsoidal, 
8s—12x5—7 y. Subiculum at first bombycinous, then collap- 
sed, sericeous and often fibrous. Hyphae soft, collapsing, 
fibulate, 2—6 w broad, often united into threads of 7—100 v. 
thickness or more. These threads or fibres often contain 
also some hyphae of another kind, viz. turgid (non collapsing), 
elastic, non fibulate, 3—4 u broad. 
That this species is the true M. himantioides of Pills can 
scarcely be doubted, as it agrees well both with his Icon. t. 193. 
f. l. and with an authentic specimen in the Kew herbarium. 
The wrong placing (in the section »Leptospori » instead of »Coni- 
ophori») is a great obstacle indeed but must be due to oversight 
or mistake of some kind. 
The collection from Lakaträsk may just as well be referred 
to Mer. umbrinus, which in fact seems to be the old state of M. 
himantioides. 
What in Germany is called M. silvester must probably also 
belong here. In his work »Der Hausschwamm » MEz seems to 
be inclined to consider this species as a »wild form» of Merulius 
lacrymans. In fact there is much analogy between them, and 
with regard to the spores the difference is scarcely perceivable. 
Nevertheless I think the two are distinct. Not only is M. hi- 
mantioides always comparatively thin, even when it extends half 
a meter or more along the trunk, but it is also always totally 
resupinate, while M. lacrymans is thick and very often pileate. 
The latter species is not restricted to houses. Some years re- 
cently it covered the whole underside of a big fallen trunk of 
Abies in a wood near Stockholm and formed thick pilei along 
the whole margin. 
Merul. himantioides BRES. Fungi Pol. pag. 83 belongs to 
Merul. hydnoides Henn. (Hydnum pinastri FR.) and is quite 
distinct from the true M. himantioides. 
