Objective: To observe the external morphology of Histiostoma feroniarum hypopus under light microscope.
Methods: The samples were collected in a mushroom cultivation base, and the Histiostoma feroniarum hypopus was isolated and purified. The slide samples were prepared and observed under an optical microscope.
Results: The back body of the Histiostoma feroniarum hypopus was flat with tiny bristles, the epidermis was of significant ossification, the ventral had four pairs of slender feet stretched, the sucker plate was prosperous in the end of the body, and the sucker plate had eight suckers. The gnathosoma was thin, long and highly specialized.
Conclusion: The light microscopy shows the morphological characteristics of Histiostomaferoniarum hypopus, providing the basis for identifying the hypopus.