Following the interest of told stool, here some mushy infos and contribution form growers or pickers most welcome...
I just found out by googling around that if:
There is a cup head and one ring at foot, DO NOT PICK THOSE...
Here some infos taken on the website of national mycology laboratories of Thailand...
-Mushrooms-
(Various textures of caps and stalks for mushroom)
Mushrooms (sometimes called agarics) are also club fungi (Basidiomycetes). As with 'coral fungi' and 'braket-fungi', 'mushroom-fungi' is used here for convenience and not to designate a formal scientific group. Most of the members of this group have fruiting bodies with a central stalk and a cap, much like those illustrated below. However, there are some with laterally attached stalks and some with no stalks at all.
The mushrooms can also be divided roughly into four subgroups on the basis of the spore forming surface on the underside of the cap. This may be comprised of spores, fold-like ridges, teeth or knife-like plates called gills or lamellae. These are important features in identification. Also important for indentification are the outer features of the cap and stalk, as illustrated below. Most of the commercial fungi we eat come from this group.
For wild fungi, there is no easy or simple test to know which are edible and which are not. The only certain way to know is to identify them to species and find from the literature whether they are safe to eat.
Amanita hemibapha
This brilliant Amanita is edible, and many willage people in Thailand collect the sporocarps to eat or sell. However, for those who are uncertain, it is probably best to avoid eating any mushroom which possesses both a ring and a cup.
Amanita (mira)?
This may be a light yellow variety of Amanita close to temperate Amanita muscaria. However, having no firm identification, and seeing both a volva and a ring, we are very well advised not to eat it.
Amanita (tibidjensis)?
The edibility of the mushroom is unknown, but it resembles soem of the most poisonous mushrooms known, one sponful may be enough to cause a painful death. White mushrooms with both a basal cup (volva) and a ring (annulus) should not be eaten.
Amanita sculpta
This is a very young sporocarp. If fully mature it would expand to a gigantic, shaggy structure (over 30 cm. high); an impressive sight in the forest. It is not known whether it is edible or not.
Boletellus emodensis
One would not miss this large, bright mushroom during a walk in the forest. The underside of the cap shows pores that are covered by a veil in young specimens. When the cap expands, the veil tears remaining attached to the edge of the cap, rather than forming a ring on the stalk.
Hygrocybe sp.
This is a small but very brilliantly colored mushroom having gills with a waxy texture. In spite of its small size, it is usually not overlooked because it tends to come up in troops. The genus has a large number of species and it has not been well studied in thailand.
Rusula sp.
This a bright representative of another large genus that has not been well studied in Thailand. These are important fungi because many from close and specific partnerships with the roots of forest trees. With their fungus partners, trees are not only stronger but able to survive in nature.
Strobilomyces velutipes
This is a young fruiting body. When expanded, the spore bearing surface on the underside of the cap will be arranged as pores. They are white, at first, but soon change to dark grey and they bruise blace. Although the black color may not look very appetizing, this mushroom is edible.
Coprinus disseminatus
Sporocarps of this mushroom genus usually occur on the ground or on dung and the caps usually undergo rapid auto-digestion to form a black inky mass. Thus, they are often called 'inky-caps'. However, the species shown here is growing on buried wood and does not have an inky cap.
Marasmius purpureostiatus
The genus Marasmius is another very large genus in Thailand. Mushrooms in this genus tend to be small and delicate. Many dry well and tend to reassume their original shape when moistened. Another dedicated specialist is needed to study this group.
Pleurotus eugrammus
Resembling its familiar oyster mushroom relatives from supermarket trays, this pleurotus is seen here in its natural setting. Usually ot attacjes doredt;u tp tje wooden substrate with or without a very short lateral stock, but some specimens on the top of a fallen log can have a short central stalk.
Filoboletus manupularis
This mushroom arises in clusters on decaying logs. It has pores on the underside of its cap rather than gills. On a very dark night, the patient and adventures some can see this mushroom glow in the dark with an eeie, greenish light.
Dictyopanus gloeocystidiatus
Although this fungus looks like a tiny bracket fungus, it is actually a mushroom type fungus with pores insted of gills. This unusually large crop was found on a decaying stump at Nam Nao National Park.
Gomphus floccosus
Looking like a horn of plenty, this mushroom has ridge like folds on the underside of its cap. This specimen was photographed at Nam Nao National Park near the Headquarters. Although it looks rather appetizing, it is poisonous for some people.
Trogia infundibuliformis
Like clusters of transluscent pink petals, the fruiting bodies of this mushroom decorated a decaying tree branch at Kaeng Krachang National Park. The underside of the cap is arranged into fold-like ridges instead of gills, and old caps often split into a number of petal-like lobes.
Anthracophyllum nigritum
The plain pinkish-orange top of this small mushroom contrasts starkly with its brilliantly colored gills. These become darker, almost black with age, and hence the name. Like the oyster mushroom, it is attached directly to the substrate and lacks a stalk.
© 2002 Mycology Laboratory, The National Center for Genetic Engineering and Biotechnology, Thailand