Explanation

In endophytic mycorrhiza, fungal hyphae present inside or between the cells of cortex, act as biofertilizer. In many grasses and some other crops, the fungal hyphae penetrate to the cortical cells, which swell to from vesicles or arbuscules. This is called Vesicular Arbuscular Mycorrhiza (VAM). It has significant role in phosphate nutrition in plants.