Angles of less than 90 degrees are called acute angles.

小于90度的叫。

The characteristic of hyphae are regular width and septation with typical branching in acute angle (about 45 degrees) in PAS stain.

病理切片经由PAS染色清楚可见麴菌菌丝，具有分隔，且分枝状，45度，特徵。