David,
1) There's no results of your research at the link. Have you published this
research ? Has anyone else come to the same conclusions as you ?
1) Not on the internet and not in English, only in private communications
among colleagues, as my research is still in progress and probably will be
published next year. And no, this far all research on G. australe was done in
vitro (Schwartze), i.e. not in situ and not on living trees.
2) Your definition of 'biotrophic parasite' - "meaning the parasite dies once
the host is killed", from the link - doesn't fit with my experience of G.
adspersum/australe colonies dying once the tree dies, or my understanding of
the definition. I understood a biotroph to be something that required living
tissue to feed off, which is both at odds with my first point and with G.
adspersum/australe colonising heartwood or age-altered wood.
2) To produce FB's, all annual and perennial bracket fungi decompose (the
sugar polymere cellulose of) the heartwood and convert it to the sugar
polymere chitin (cell walls), in the process of which about 20 % of the in
the wood stored energy is lost. Biotrophic parasitic macrofungi produce FB's
in the same way, but they - other than necrotrophic parasites - need contact
with living tissues to facilitate the process. Biotrophic fungal parasites
only or predominantly feeding off living tissues would have an extremely
short life cycle and would never be able to produce annual or perennial FB's
of some magnitude, because they would kill the tree before the reproductive
cycle of the mycelium could come to its full development.
And a question : Did you microscopically check and identify all specimen of
G. australe and G. lipsiense documented from all tree species you found
either one of these Ganoderma's on to be 100 % sure which one of both species
you found on what tree species and if so, did you ever assess G. australe
fruiting on/from dead wood alone ?
3) Has your research established that G. adspersum/australe invades and
colonises functional living xylem?
3) Yes, just as all in situ research on living trees shows that all
Ganoderma's and all other necrotrophic and biotrophic parasites do.
4) From my own field research on the effects on the stability and condition
of different deciduous tree species of the biotrophic parasitic G. australe,
of which the mycelium causes a white rot with selective delignification, that
is most detrimental to Acer, Platanus, Populus, Salix, Tilia, Aesculus (Anne
Frank tree) and Quercus rubra.
4) See 1)
5) And, in your first posting on this thread you said G. adspersum/australe
was fatal to Acer. Is that what you meant, or are you qualifying it by saying
it is more 'detrimental' to your listed genus above than the genus not listed.
5) Both times yes, with the addition, that it's even more detrimental/fatal
to Acer saccharinum.
Regards,
Gerrit
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