hypha; fungal filament
Biological term for the thread-like structures that make up the mycelium of a fungus. Used in both singular (hypha) and plural (hyphae) contexts.
The hyphae have spread throughout the culture medium.
このキノコの菌糸は白くて細い。
The hyphae of this mushroom are white and thin.
mycelium
Compound of 菌 (kin, 'fungus') and 糸 (shi, 'thread'). The reading is on'yomi for both characters.