Technical description not yet available.

BRIEF DESCRIPTION: The original description (Corner & Bas, 1962) is the source of the following. The cap of A. xanthomargaros is 45 mm wide, plano-convex, dry, with a nonstriate margin. The cap is fuscous-brown to olivaceous brown, fuscous over the disc, yellowish near the margin, with innate, dark, radiating fibrils. The cap is set with numerous, friable, soft, conical umber-brown warts with yellow tips.

The gills are free, crowded, and white.

The stem is 55 x 3 - 8 mm, attenuate upward, solid, pale grayish brown, and yellowish at the apex. The flesh is white, becoming pale brownish or grayish-brownish on cutting, especially in the stem.

Spores from dried material measure 5.4 - 6.4 x 4.4 - 5.3 µm (from fresh material, 6 - 7 x 5 - 6 µm wide) and are subglobose to broadly ellipsoid and amyloid. Clamps were not observed at the bases of basidia.

This species was described from Singapore. For comparison, see A. pausiaca Corner & Bas. Small taxa in section Validae with friable yellow volvas are listed for purposes of comparison under A. flavoconia G. F. Atk. var. flavoconia. -- R. E. Tulloss

Watercolor: Prof. E. J. H. Corner (Singapore, illustration from original description (Corner & Bas, 1962) reproduced by courtesy of Persoonia, Leiden, the Netherlands.)

Return to Section Validae page.

Last change 9 October 2004.
This page is maintained by R. E. Tulloss
Copyright 2003, 2004 by R. E. Tulloss
Watercolors copyright 1962 by Persoonia)