A spore assemblage associated with Psilophyton and Hostimella is described from the Witney (Apley Barn) Borehole, Oxfordshire, England. Miospore genera include Punctatisporites, Retusotriletes, Cyclogranisporites, Acanthotriletes and Emphanisporites; megaspores of up to 400 μ diameter are assigned to Trileites Erdtman. The whole assemblage is regarded as representing a Middle or, more probably, Lower Devonian age.
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William G. Chaloner (1963) studied this question.
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