Trip to Chondrostereum & Poplar Polder (Flevoland, Netherlands)
meindert de jong <^_^>
vlinders at rcl.wau.nl
Sun Oct 3 14:46:48 EST 1993
Past Friday I visited an amateur mycologist at Flevoland. I
would like to know something about the natural occurrence of
Chondrostereum pupureum in this Dutch polders.
There appears to be an overwhelming abundance of carpophores
of Chondrostereum purpureum in this newly formed Dutch polder
due to many clearcuttings of poplar forests and logging. I saw
for instance a heap of more than hundred poplar stems of one
year old with on each sawing area (2) more than A=100 cm2 area
of fructifications. Due to the very fast fungal succession (and
a few nights with frost) all basidiocarps had turned brown and
There appears to be an unusual rapid fungal succession on wood
stumps and wood logs in this new Dutch polder. On one year old
poplar logs, I already noted toadstools of Ozonium coprinus,
Pholiota destruens, the so-called "wimperzwammetje" (Scutelli-
nia scutellata), many Nectria spp. etc.
Cylindrobasidium evolvens and C. purpureum is an often found
association on poplar logs and stumps (For a description with
photo you should consult Jahn (1979); Pilze die an Holz wach-
sen, pp.88-89) I saw many resprouting poplar logs laying onto
the ground. Most poplar forests happen to be about 20 years
old. The coming years many clearcuts are to be expected. This
will be followed by a long clearcut break.
Besides we notified leaves of maple with a leaf spot disease:
dark leaf spots surrounded by a light green zone (caused by
the "inktvlekkenzwam" (Rhytisma acerinum)). It is an ascomy-
cete which sporulates in April and May. This is an indication
of clean air (less air pollution).
Back home we isolated a few cultures from the spore shedding of
Sincerely Yours, dr Meindert D. de Jong | seeking a
E-mail: Vlinders at RCL.WAU.NL | telejob
Voice: (+31) 8370 21937 FAX: (+31) 8370 23110
Photo:de Jong e.a.'90. Risk Analysis for Biological Control.
A Dutch case study in biocontrol.. Plant Disease 74: 189-194.
Letter to the Editor '92: Risk Assessment for the Application
Biological Control of Forest Weed by Fungus.Risk Analysis 12:
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