Abstract
Microscopic examination of horse cecum contents revealed vegetative growth of phycomycete fungi on particles of digesta, and uniflagellated cells similar to fungal zoospores in the liquid phase. Three morphologically distinct isolates of strictly anaerobic phycomycete fungi were obtained from the cecum contents and cultured in vitro. Two isolates utilized a wide range of plant carbohydrates for growth, including .alpha.-cellulose, xylan and particulate starch, and extensively digested water-insoluble plant tissues.