No strong seasonality has been detected in death of twigs which subsequently bear T. pinastri , though there may be a slight peak in the autumn. In much of southern Sweden the fungus is so abundant that virtually all dead attached twigs subsequently develop fruitbodies of the fungus. By mid-July most ascomata are opened and some contain empty asci. Exact opening time seems weather dependent. Tryblidiopsis pinastri may thus be an endophyte.
Evidence is, however, no more than circumstantial.
The fungus has not been recorded in the UK despite frequent searches. By air-borne ascospores in humid conditions. The distinctive 1-septate ascospores of the present fungus make it unlikely to be confused with any other species known from twigs of the Pinaceae . Cech, Mitteilungsband Forstl.