It seems that staining could be helpful in this picture (Figure 4.5A in Brundrett et al. 1996) but I am not sure, since many people didn't stain the roots when quantifying ectomycorrhizal colonizations.
References:
Brundrett M, Bougher N, Dell B, Grove T, Malajczuk N (1996) Working with Mycorrhizas in Forestry and Agriculture. ACIAR Monograph 32. Australian Centre for International Agricultural Research, Canberra.
https://www.aciar.gov.au/publication/working-mycorrhizas-forestry-and-agriculture
https://mycorrhizas.info/method.html