Meripulus on London plane,

[Tony Croft aka hamadryad]

Not like the one with the caliper, this is a reiterative root, but It is not one of the ones I was describing which look more like this. here we can see Meripilus doing its thing, and decaying the underside of the bigger main root into a horsheo like form with 45 degree approx re iterative roots coming from the occlusion rolls. Thes act as shear kill in the root plate. I would want personaly to see as many of these as possible going down into the soil at 45 degrees approx, I guess there would be an optimum number per square metre of shear root ball area I can only at this stage guess as to the number required and I would want at least half a dozen in a few square feet of rooting area, indicating good vigour and vitality, and making good adjustments to loads.