Small white colonial tubular mushroom, unidentified (genus " Henningsomyces " , marasmiaceae family? or more probably Ceratiomyxa fruticulosa), Growing on a substrate of dead-wood (tree trunk lying on the ground) observed august 2015 in Touvérac (France), near the old quarries of Touvérac (site run in 2015 by the regional conservatory for natural spaces of Poitou-Charentes)