The cap is 42 mm wide, yellow to brownish yellow over disc, with a white margin, and not umbonate. Its margin is striate for about 40-45% of the pileus radius). The volva is often present on the cap as an easily removed small white patch or patches.
The gills are crowded, and cream in mass. The short gills are truncate to subtrucate, unevenly distributed, of diverse lengths, and plentiful.
The stem is 98 × 8 mm, off-white, pinkish-brownish in age, subfloccose to subfibrillose, finely striate lengthwise, and lacks a ring. At the stem's base the volva is sack-like, membranous, white on the outer surface, white above and yellow below on the inner surface, and attached only at the stem's very base.
The spores of this species measure (9.5-) 10.3 - 13.2 (-13.7) × 6.0 - 8.0 μm and are ellipsoid to elongate to (infrequently) cylindric and inamyloid. Clamps are probably present on bases of basidia.
??.—R. E. Tulloss
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The following material is based on original research of R. E. Tulloss.
41 mm wide, yellow to brownish yellow over disc, thence white to margin, planar, without notable umbo, subviscid, shiny; context ??; margin striate (0.4-0.45R), nonappendiculate; universal veil as small membranous patches, white, detersile.
??, lacking decurrent line on upper stipe, crowded, cream in mass, ?? in side view; lamellulae truncate to subtruncate, unevenly distributed, of diverse lengths, plentiful.
98 × 8 mm, off-white, staining pinkish brown in age, narrowing upward, flaring at apexi, subfloccose, fibrillose, longitudinally striatulate; context cream, unchanging, hollow, with central cylinder 2.5 mm wide; partial veil superior, small, membranous, persistent, white, faintly striate above, smooth below; universal veil saccate, 30 × 18 mm, membranous, sturdy, exterior smooth, white on both surfaces except for some yellow tint on lower part of inner surface, attached only to stipe base (which is rather broad for a species of the “A. hemibapha group”).
RET: [20/1/1] (9.5-) 10.3 - 13.2 (-13.7) × 6.0 - 8.0 μm, (L = 11.8 μm; W = 6.9 μm; Q = (1.44-) 1.47 - 2.01 (-2.20); Q = 1.71), ??, smooth, inamyloid, ellipsoid to elongate to (infrequently) cylindric, dominantly adaxially flattened, occasionally constricted, of very irregular form in the material examined to date; apiculus sublateral, cylindric, moderately large proportionately; contents ??; ?? in deposit.
Solitary. In sand with organic material.
U.S.A.: TEXAS—Jasper Co. - Martin Dies St. Pk., ca. Jasper, 9.vi.2000 NAMA2000 participant s.n. [Tulloss 6-9-00-A, NAMA2000 #171] (F; RET 312-9).
The following diagram provides sporograph comparisons of the present species with A. cokeriana (a poorly known species) and A. murrilliana, a species known to occur in the Gulf Coast/east Texas region.
Since the single specimen known to us was considered to be beyond maturity at the time it was collected and dried, it is possible that it represents such a specimen of A. cokeriana, which is at present known to us only from the protolog despite searches for type material in FH and FLAS. Singer did not provide the place of deposit of his type material for cokeriana.
—R. E. Tulloss
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