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Colonized (dark) and noncolonized ryegrass roots observed by stereo microscope with a relatively low magnification. The colonized root is easily distinguishable from the noncolonized root. Bar = 25 µm.	Individual hyphae in both heavily and partially colonized sections of a bean root are clearly visible. The diffuse dark spots are arbuscules. Bar = 20 µm.	You see the brown central cylinder of a ryegrass root, with the more yellowish root cells beside. In some of the root cells you can clearly distinguish the dark stained arbuscules. Bar = 20 µm.
Again you see the brown central cylinder of a ryegrass root with fungal vesicles and internal hyphae. Bar = 20 µm.	Arbuscules (e.g. in the right upper corner) and internal hyphae in bean root tissue. Bar = 5 µm.	Penetration unit (appressorium) of Glomus mosseae in a ryegrass root stained with blue ink (Pelikan). Bar = 20 µm.