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evidence: Archaeomarasmius is an extinct genus of gilled fungus in the Agaricales family Tricholomataceae , containing the single species Archaeomarasmius leggetti .. Agaricales. Agaricales. Tricholomataceae. Tricholomataceae. genus. genus. fungus. fungus. species. species. It is known from two fruit bodies recovered from amber , one consisting of a complete cap with a broken stem , the other consisting of a fragment of a cap .. fruit bodies. basidiocarp. amber. amber. cap. pileus ( mycology ). stem. stipe ( mycology ). The cap has a diameter ranging from 3.2 to , while the stem is 0.5 mm thick .. cap. pileus ( mycology ). stem. stipe ( mycology ). Spores were also recovered from the amber , and are broadly ellipsoid to egg-shaped , measuring roughly 7.3 by 4.7 μm .. amber. amber. micrometre. The species , which resembles the extant genera Marasmius and Marasmiellus , is inferred to have been saprobic on plant litter or other forest debris .. species. species. Marasmius. Marasmius. Marasmiellus. Marasmiellus. saprobic. saprobic. plant litter. plant litter. forest debris. forest floor. The genus is solely known from the New Jersey amber deposits along the Atlantic coastal plain in New Jersey , United States , which date from the Turonian stage -LRB- about 90 -- 94 Mya -RRB- of the Upper Cretaceous .. genus. genus. amber. amber. New Jersey amber. New Jersey amber. Atlantic coastal plain. Atlantic coastal plain. New Jersey. New Jersey. Turonian. Turonian. Mya. Mya ( unit ). Upper Cretaceous. Upper Cretaceous. Archaeomarasmius is one of only five known agaric fungus species known in the fossil record , and the only one to be described from New Jersey amber .. fungus. fungus. species. species. amber. amber. New Jersey amber. New Jersey amber. New Jersey. New Jersey