On Mucronella rickii and Pterula gracilis

Among the minute clavarioid fungi, my attention was drawn to Ceratellopsis and the tiny Pterula gracilis of which the last one has been collected several times in the Netherlands. Pterula gracilis is a species not always easily recognized as a Pterula and more often identified as a Typhula, although the hyphae are too thick-walled for that genus. Typhula, inclusive of Cnazonaria, Pistillaria and several other closely related genera, is characterized by a monomitic hyphal system, and so is the genus Ceratellopsis, which differs from Typhula mainly in the distinct sterile, apex of the basidiocarp and the absence of sclerotia.