Leptosphaeria acuta (Moug. & Nestl.) P. Karst., a.k.a. the Nettle Rash. It's a pathogen of nettle (Urtica). You can find it almost anywhere where nettle grows - if you look close enough :)This particular colony grew on a last year's nettle stalk right near prospekt Lavrentieva, one of the main streets of Akademgorodok.