Archaeomarasmius is an extinct genus of gilled fungus in the Agaricales family Tricholomataceae, containing the single species Archaeomarasmius leggetti. 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. The cap has a diameter ranging from 3.2 to 6 mm (0.13 to 0.24 in), while the stem is 0.5 mm (0.02 in) thick. Spores were also recovered from the amber, and are broadly ellipsoid to egg-shaped, measuring roughly 7.3 by 4.7 μm. The species, which resembles the extant genera Marasmius and Marasmiellus, is inferred to have been saprobic on plant litter or other forest debris.
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 (about 90–94 Mya) of the Upper Cretaceous.[1]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.
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Archaeomarasmius is an extinct genus of gilled fungus in the Agaricales family Tricholomataceae, containing the single species Archaeomarasmius leggetti...
that the earliest known mushroom-forming fungi (the extinct species Archaeomarasmius leggetti) appeared during the late Cretaceous, 90 Ma. Some time after...
fossil record. Others include Aureofungus, Protomycena, and Archaeomarasmius. Archaeomarasmius leggeti, from Atlantic Coastal Plain amber, is 90–94 Ma);...
that the earliest known mushroom-forming fungi (the extinct species Archaeomarasmius legletti) appeared during the mid-Cretaceous, 90 Ma. Some time after...
Burmese amber and the slightly younger Turonian New Jersey Amber species Archaeomarasmius leggeti. The three other species, Aureofungus yaniguaensis, Coprinites...
the amber mines of the Dominican Republic, while the third species Archaeomarasmius leggeti is from the older Cretaceous age New Jersey Amber. With the...
Apterostigma cultivate species of Tricholomataceae. The extinct genus Archaeomarasmius, described from Turonian-age New Jersey amber, is one of four known...
more evidence for the possible insect origin of the resin production. Archaeomarasmius leggeti Juniperus hypnoides? Fagales Genus and species indeterminate...
the amber mines of the Dominican Republic, while the fourth species Archaeomarasmius leggeti is from older Cretaceous age New Jersey Amber. With the 2007...
the amber mines of the Dominican Republic, while the fourth species Archaeomarasmius leggeti is from the older, Cretaceous age New Jersey Amber. With the...
Burdigalian amber mines of the Dominican Republic, while the fourth species Archaeomarasmius leggeti is from the slightly younger Turonian age New Jersey Amber...
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