| eyespot [`ī´spät] BOTANY 1. A small photosensitive pigment body in certain unicellular algae. 2. A dark area around the hilum of certain seeds, as some beans. INVERTEBRATE ZOOLOGY A simple organ of vision in many invertebrates consisting of pigmented cells overlying a sensory termination. PLANT PATHOLOGY A fungus disease of sugarcane and certain other grasses which is caused by Helminthosporium sacchari and characterized by yellowish oval lesions on the stems and leaves. |