Phytophthora cambivora (Petri) Buisman (1927) causes root rot and stem canker on several forest species in Europe and North America. It causes ink disease of chestnut (Day 1938, Vannini & Vettraino 2001, Vettraino et al. 2005). Other hardwoods, especially members of the Fagaceae, such as European beech, chinquapin, and tanoak (rarely), are affected (Belisario & Maccaroni 2006, Nelson et al. 2010, Orlikowski et al. 2006, Reeser et al. 2007, Saavedra et al. 2007, Schmitz et al. 2007).
Etymology: combining the Latin for "cambium" and “devouring.”
Phytophthora cambivora is heterothallic, forming characteristic warty, or bullate oogonia with 2-celled antheridia when paired with the opposite mating type. Sporangia are nonpapillate, about 55–65 μm by 40–45 μm, and broadly ellipsoid or ovoid. They are persistent, on simple, unbranched sporangiophores and exhibit internal, often nested proliferation as well as external extension of the sporangiophore. Chlamydospores are absent. Hyphal swellings are rare.