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346
äfven utan blótning i vatten tillräckligt fuktig och klibbig för att
kunna liksom fastlimma sporerna vid de fasta föremål, hvarmed de
komma 1 beröring.
FROM WHERE ORIGINATES THE BROWN POWDER ON THE SURFACE
OF POLYPORUS APPLANATUS, POL. LUCIDUS ETC.?
Summary.
The opinion or theory set forth by ScHuLzer in Flora, 1878: 11,
and Oesterr. bot. Zeitschrift, 1880: 321, and endorsed by several
other mycologists, viz. that the powder often occurring on the sur-
face of Hymenomycetes, for instance the chocolate-brown powder
on Polyporus applanatus, Pol. lucidus etc., consists of conidia which
_originate on the surface where they lie, is not to be upheld, be-
cause it seems to be incompatible with the following facts:
1. Said powder is not restricted to the fungus surface itself, it
occurs also on leaves, bark-pieces, sand-grains and other objects
accidentally adhering to said surface. A
2. It occurs not only on the fresh and living surface but
also on laccate and resinous surfaces and even on old and dead
ones which can not be considered adapted to generate spores or
conidia.
3. Some pieces of card-board pinned on the surface of Polypo-
rus applanatus in May proved in July to be covered with a layer
of the brown powder, and so was the surface of the fungus also
except the spots, which had been protected by the card-board pie-
ces. Moreover the upper surface of the leaves of a small plant of
Acer overshadowing the fungus also proved to be covered with the
brown powder, though these leaves were situated 10—20 cm. above
the fungus, and no fungus was growing above.
These facts show that the powder must have been suspended in
the air before it accumulated. And the uniformity of the layer
suggests the opinion that it was deposited in calm weather. This
being admitted, we are obliged to believe that the powder origina-
tes from the pores and thus consists of basidio-spores.
But how can the spores be lifted and suspended in the air,
though they are heavier than the air and thus should fall instead
of rise?
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