UKTC Archive

RE: Ganoderma applanatum/australe on n.maple - implications

Subject: RE: Ganoderma applanatum/australe on n.maple - implications
From: Rupert Baker
Date: Dec 30 2011 18:50:47
It is a very useful book, Luke - I found it in a 2nd hand bookshop.
In it, the authors say, in relation to F hepatica:
A trunk and branch rot; microscopic details: simple clamp connections are
present but scarce; penetration of cell walls - usually through pits; in
form, wide hyphae constricted at Septa occur along with normal ones; often
with red-brown contents and invested in a dark brown gummy material.
optimum temp for growth 26 degrees C. It grows readily on agar with 5% malt,
and 0.5% malic acid; It grows hardly at all on sterilised oak blocks under
lab conditions and causes but little decay even after a year (at optimum
temp). Somwhat more vigorous growth develops on heartwood rather than on
sapwood blocks. Cartwright (1937) found that it grows rather better on media
containing upto 1.25% oak tannins - a conc. That checks the growth of many
wood-rotting fungi; and suggests that the fungus can break down tannins and
utilise the sugar thereby released.  The Cartwright ref is from Transactions
of the British Mycological Society, Vol 21, 68-83 titled 'A reinvestigation
into the cause of 'brown oak' - F. Hepatica'

As you say, this strongly suggests a heartwood specialist.

All the best


-----Original Message-----
From: luke steer [] 
Sent: 30 December 2011 12:09
To: UK Tree Care
Subject: RE: Ganoderma applanatum/australe on n.maple - implications

Dear Tony and Gerrit,
As all the published references I've found to date indicate that F. Hepatica
is primarily a heartwood decay fungus, they provide substantial credibility
for that notion.  I suggest that to disprove that concept will require
scientific method and rigour and publication in a peer reviewed Journal such
as The New Phytologist. 

Since I sent my previous email I've been told that Cartwright (1937, cited
in Cartwright & Findlay 1946, "Decay of timber and its prevention") found
that F. hepatica grew better on heartwood than on sapwood blocks.  I don't
have a copy of that publication so I'm unaware whether or not the sapwood
contained live cells and, if so, whether the hyphae were able to colonise
these or were restricted to physiologically dysfunctional cells, aerated or

Finally, many of the concepts you suggest are interesting but, for me at
least, I consider that additional evidence is required to prove them,
ideally reviewed by established experts.  Keep up the good work and one day
you may get there.  

All the best for the New Year celebrations.


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