NAME Palaeosclerotium pusillum
AGE Middle Pennsylvanian   AGE span: 311.7...307.2 mya
K&J CLASSIFICATION (2000) Ascomycetes, Erysiphales.
FIGURE(S)
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FIGURE REFERENCE Rothwell GW. 1972. Paleosclerotium pusillum gen. & sp. nov., a fossil eumycete from the Pennsylvanian of Illinois; Canadian Journal of Botany, v. 50, p. 2353-2356.
SPECIES, AUTHORITY P. pusillum Rothwell 1972, p. 2354, pl. 1, figs. 1 (at right), 3; pl. 2, figs. 4-5, 7-8.
LOCATION Harrisburg Quadrangle, Williamson County, Illinois, USA.
ORIG DESCRIPTION* Characteristics of the species those of the genus. Oval-spherical sclerotium measuring 0.75-1.20 mm in diameter. Hyphae of medulla much branched and septate, measuring 2-4 µm in diameter. Hyphae often exhibit short, bud-like branches. Spherical cavities present in medulla, containing amorphous contents, and measuring about 40 µm in diameter. Cells of cortex isodiametric or slightly radially elongated, measuring up to 26 x 14 µm. Rind 1-5 cells thick, cells exhibiting thickened walls, and measuring about 10 µm in diameter. External hyphae or fruiting structures unknown.
COMMENTS* As for the genus.
PUBLICATION REFERENCE Rothwell GW. 1972. Paleosclerotium pusillum gen. & sp. nov., a fossil eumycete from the Pennsylvanian of Illinois; Canadian Journal of Botany, v. 50, p. 2353-2356.
K&J REMARKS As for the genus.
TYPE
ALL NAMES (Including synonyms) Palaeosclerotium pusillum
SERIAL NUMBER 1229
PUBLIC COMMENTS
 *For source, see Publication Reference.