Constrictolumina

Constrictolumina is a genus of lichen-forming fungi in the family Trypetheliaceae. These tropical lichens form crusty growths that lack a protective outer layer and merge directly with their growing surface. They produce cone-shaped fruiting bodies that push up through the crust and release spores through a tiny opening at the tip. The genus gets its name from the distinctive spores, which have internal walls that fold inward and create narrowed, constricted spaces inside each spore. ...read more on Wikipedia.