The International Institute of Species Exploration (Arizona State University) each year publishes a list of the ten most astonishing species described during the year. For the 2011 list, two fungi were included: Mycena luxaeterne and Psathyrella aquatica.
Mycena luxaeterna Desjardin, B.A. Perry & Stevani is a strongly bioluminescent agaric described from Brazil (Desjardin, D.E., B.A. Perry, D.J. Lodge, C.V. Stevani, and E. Nagasawa. 2010. Luminescent Mycena: new and noteworthy species. Mycologia 102(2):459- 477. LINK).
Psathyrella aquatica R.A. Coffan, J.L. Frank & D. Southw. is a species of Psathyrella apparently growing under water in a river i Oregon (Aquatic gilled mushrooms: Psathyrella fruiting in the Rogue River in southern Oregon. Mycologia 102(1): 93-107 LINK. -- alas, behind a paywall).
Candidates for the next list can be nominated here.