Soak all the fungus until fully expand for 1 hour and cut them in pieces for later use;
Peel off and wash the zucchinis then cut them in thick slices;
Add 750ml water to boil in a wok, add the seasonings and zucchini and turn to simmer with medium heat to soften the zucchini. Get the soften zucchini out of the wok on a serving plate;
Put all the fungus in the same wok and cook for 5 minutes with low heat. Put in the potato starch mixture to thicken the soup. Pour the fungus and soup on the zucchini then finish.