If Chlorophyllum molybdites (and in Texas it could be), just add them
to the compost pile. Be sure to wash your hands afterwards, or at least
wear gloves when picking them. C.m. is poisonous to many people.

If Agaricus (or a volva-less Amanita) the same caveats apply. An
Amanita is far more problematic than an Agaricus. In Oregon Amanitas
can be anything from 2 inches tall to 24 inches across; in Texas they
would probably be smaller. (Contrary to many Texan's belief, not
_everything_ is bigger in Texas. Except tales, maybe.G)

Check out Google images for photos of above possibilities.

But you are right that the mushrooms would not be Marasmius oreades
(fairy-ring mushroom) if they have white stems or caps. A. mellea is
better known as "Honey Mushroom", and typically has a golden-brown cap
and stem. Also, A. mellea is almost always found in clusters/clumps.
Single mushrooms are possible on ground, but are less common in my
experience.

Daniel B. Wheeler
www.oregonwhitetruffles.com