The hymenium is located beneath the cap and contains the spore-forming organs of the fruiting body, i.e. spore sacs (asci) or microstructures (basidia).
Sources
Britannica – Hymenium 
Natur & Kultur – Unusual Edible Mushrooms …
Hymenium
Knowledge
Veil
Hyphae
Hyphae are the thin, thread-like underground structure of the fungi. The mycelium consists of a network of hyphae. The hyphae absorb nutrients from the Soil and are used for propagation by forming fruiting bodies.
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Cap Scales
Cap scales are the structure on the hat or cap characteristic of many species. The scales form a hard-shelled protection for the fungi and appear in various shapes and sizes. They also give mushrooms in the wild …
Poisonous Fungi
Poisonous mushrooms include all harmful or deadly species to consume. Most people know that Red Fly Agaric is poisonous; other poisonous mushrooms include the Brown Fly Agaric, the Insidious fly agaric, and the False Morel …
Colorful Fungi
Many fungi, which we call dye fungi, can be used to dye fabrics or yarn. Examples include the Blue Pinkgill mushroom(New Zealand), which gives a …
