Friesia III, 5

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in carnata på rips og eple ; vide re har vi Cyphella punctijormis) Peniophora
cinerea og Inonotus radiatus på rips og Phellinus ribis
på rips og stikkelsbær.
SU M MARY
Lignicolous and Corticolous Hetero basidiomycetae an d Aphyllophoraceae
on F ruit Trees and Small Fruits in Norway
Of t he 41 fungus species liste d (t able p. 374) t he following produce
stem rots on liv ing fruit trees, viz. Stereum purpureum particularly
on plums (also parasitic on Rubus idaeus ), further Laetiporus
sul phureus and Phaeolus Schweinitzii on che rries, Phellinus igniarius
on apples and its subsp. pomaceus chiefly on plums, Ph . ribis on red
currants and gooseberries, and probably also Ph . conchatus, which
latter has rarely been found on che r ry, possibly also on apple. Most
of the other fungus species were in part found on living trees, but
then chiefly saprophytically on dead parts; some however appeared
occasionally to be weak parasites.
Phellinus igniarius on apples and its subsp. pomaceus on plums
occur chiefly in the eastern part of the country; of the first one
only very few finds have been made in the western, fruit-growing
districts, and of the second one none (except one case on cherry).
Fomes piniool a, which occurs in the east on fruit trees as asaprophyte
or as a weak parasite, has never been found in the west on
such hosts; this may be explained by the faet, that its chief substratum
is spruce, which only to a very small extent grows indigenously
in the west.
The finds listed were all made in Southern Norway (south of
Trøndelag), with one exception, viz. Phellinus ribis , which has also
been found in the north. Only in Southern Norway fruit trees are
commonly cultivated.
Hirschioporus abietinus, which is a common saprophyte on conifers,
was once found on a living cherry tree.
Of the largely saprophytic fungi under consideration, those which
were comparatively common occurred on various fruit trees, except
Polyporus »ariu», the only fruit host of which was apple.