Kam’a, Dessert Truffles, cure for eyes, where can I get this stuff?

After reading this hadith, I’ve been wondering if this stuff is available in South Africa? :

Sahih Bukhari, Book 60

Volume 6, Book 60, Number 5:

Narrated Said bin Zaid:

Allah’s Apostle said, “The Kam’a (i.e. a kind of edible fungus) is like the Manna (in that it is obtained without effort) and its water is a (medicine) cure for eye trouble.”