Pythium Root Dysfunction of Creeping Bentgrass

Fig. 14. Pythium volutum oogonia in grass-leaf blade culture at 400x magnification showing an antheridium coiling around the oogonial stalk. This is an important diagnostic feature for P. volutum because it is one of three Pythium species that display this trait.



Image from Plant Health Progress article:
Pythium Root Dysfunction of Creeping Bentgrass