Acarospora mayrhoferi(Acarosporaceae), a New Species from the European Alps (Italian Part) and the French Massif Central

Abstract

Knudsen K. & Kocourková J. 2018: Acarospora mayrhoferi (Acarosporaceae), a new species from the European Alps (Italian part) and the French Massif Central. – Herzogia 31: 510–517.Acarospora mayrhoferi is described from the Italian parts of the Alps and from the French Massif Central. It is a lichenicolous lichen, an obligate parasite on Dimeleana oreina, eventually forming its own independent brown thallus of flat black-edged areoles. The simple ascospores are sometimes globose 2 × 2 µm, often broadly ellipsoid 3 × 2µm or ellipsoid 4–5 × 2 µm. The hymenial gel is I+ blue. It belongs to the morphological Acarospora anatolica group. A key is supplied for six similar parasitic species of Acarospora.