Like tubes, lamellae, or gills are structures on the fruiting bodies of many fungi. They aim to provide a large surface area to spread spores quickly. Their different shapes, such as downward-facing or upturned lamellae, are usually used to identify fungal species.
Sources
Mushroom-appreciation – Identify Mushrooms: Learn About Gills, Pores, and Teeth 
Natur & Kultur – Unusual Edible Mushrooms by Oliver Karlöf
April 2023, TÄNKOM | Revised February 2024 RETHINK
