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Scorias spongiosa : ウィキペディア英語版 | Scorias spongiosa
''Scorias spongiosa'' is a sooty mould fungus that grows on aphid honeydew. It is a member of the Capnodiaceae family of ascomycete fungi. It is found only on American beech trees, ''Fagus grandifolia''. ==Overview== ''Scorias spongiosa'' is a specialist and grows exclusively on the honeydew formed by colonies of the beech blight aphid, ''Grylloprociphilus imbricator''. This aphid is found only on one host plant, the American beech tree, ''Fagus grandifolia'', where it congregates on branches and twigs, creating copious amounts of honeydew that drip onto vegetation below.〔(UMass Extension: The Beech Blight Aphid )〕 The large quantity of honeydew enables this fungus to grow to a large size, much bigger than other sooty mould fungi, which produce only a thin black layer on the surface of leaves. On tree trunks this fungus has been known to grow into a mass of hyphae as big as a football, but it is more usual for the agglomeration on branches or twigs to reach a diameter of about fifteen centimetres.〔(Tom Volk's Fungus of the Month )〕
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