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Ascomycota. 
 Sordariomycetes. Hypocreales Calcarisporium arbuscula Q (anamorph) On Hypoxylon fragiforme. Identification uncertain - possibly just the anamorph of Hypoxylon fragiforme Microscope photographs of conidia below.  | 
	
 
Microscope photographs
Calcarisporium arbuscula
On Hypoxylon fragiforme. Badbury Rings, Dorset. January 2017