Abstract
Seventy-one isolates of D. umbrinella (the anamorph of Apiognomonia errabunda ), derived from beech, chestnut and oak, were examined by microscopy and electronic spore sizing. There were two distinct spore-size groups among these isolates, corresponding largely with their host origin. The group with the larger spore-size originated from Fagus sylvatica and from one isolate derived from Quercus petraea . A smaller-spored group included isolates from Castanea as well as the remaining Quercus isolates. Overall results obtained with direct microscopic measurements were confirmed by the electronic particle sizing method. Analysis of large spore populations by electronic sizing evidenced a bi-modal distribution in most isolates studied. In addition, in four Fagus isolates microconidia were also evident as a third peak that coincided exactly with the main peak of the Quercus and Castanea isolates. The use of electronic particle sizing methods to replace the more cumbersome light microscopy measurements in fungal taxonomy and ecology is discussed briefly.
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