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Mucor plumbeus
・ Mucor racemosus
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Mucor plumbeus : ウィキペディア英語版
Mucor plumbeus

''Mucor plumbeus'' is a fungus in the family Mucoraceae (subphylum Mucoromycotina) that is very common, abundant and distributed worldwide.〔〔 ''Mucor plumbeus'' is not known to be a plant or animal pathogen; however it is able to elicit an immune response in humans by activating the complement system.〔 This species is commonly found in various types of soils over a range of pH, although alkaline soils seem more conducive to its growth.〔 It is also known from the roots of wheat, oat and barley.〔 In addition, ''M. plumbeus'' is a common fungal contaminant of indoor built environments.〔 This species shares many similarities with ''M. racemosus'', another fungus that belongs to the family Mucoraceae which is known to cause mucormycosis.〔 ''Mucor plumbeus'' is a common spoilage agent of cheese, apples, apple cider and yogurt.〔〔
==Morphology and reproduction==
''Mucor plumbeus'' produces columella with distinctive, darkly pigmented, finger-like apical projections.〔〔 Sporangiophores (structures bearing asexual spores) exhibit sympodial and monopodial branching.〔 The appearance of sporangia of ''M. plumbeus'' changes throughout development from hyaline at first becoming dark brown colour at maturity.〔 Sporangiospores are spherical, ranging from 5–7 to 8–10 µm in diameter.〔 Zygospores are also darkly coloured, though much larger than sporangiospores with an average diameter of approximately 85 µm.〔 Zygospores are ornamented with short star-shaped spines (length of 3 µm).〔 The mating system is heterothallic.〔
Growth on Czapek Yeast Extract Agar (CYA) and Malt Extract Agar (MEA) produces colonies at least 50 mm in diameter, often spreading across the petri dish. The mycelium appear colourless with an overall colour of pale to deep grey from the sporangia.〔 Growth on G25N medium produces colonies 20–35 mm in diameter, which appear white to pale yellow brown.〔 ''Mucor plumbeus'' spores are commonly airborne, which could explain their vast distribution.〔 Chlamydospores have at times been found within sporangiophores.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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