growing on oak? the woodland was mostly beech. I think I saw this on 4th September 2012 on this walk: http://www.projectnoah.org/spottings/141... When I saw it in September it was at a distance. it must have been orange or yellowish because I thought it was Chicken of the Woods. Unfortunately I didn't investigate closer though.

C. majalis is a herbaceous perennial plant that forms extensive colonies by spreading underground stems called rhizomes. New upright shoots are formed at the ends of stolons in summer,[5] these upright dormant stems are often called pips.[6] These grow in the spring into new leafy shoots that still remain connected to the other shoots under ground, often forming extensive colonies. The stems grow to 15–30 cm tall, with one or two leaves 10–25 cm long, flowering stems have two leaves and a raceme of 5–15 flowers on the stem apex. The flowers are white tepals (rarely pink), bell-shaped, 5–10 mm diameter, and sweetly scented; flowering is in late spring, in mild winters in the Northern Hemisphere it is in early March. The fruit is a small orange-red berry 5–7 mm diameter that contains a few large whitish to brownish colored seeds that dry to a clear translucent round bead 1–3 mm wide. Plants are self-sterile, and colonies consisting of a single clone do not set seed.[7]

Species of leaf beetles from the subfamily Cryptocephalinae.

It was very clear that the ants had differens tasks during the movement and they were very organized.