Key to the Telia
Telia appearing on galls. Galls globoid or reniform. Telia somewhat conical, chestnut-brown (pg 509-10)

Telia scattered on globose or reniform galls, conical or cylindrical-acuminate, becoming 3-10 mm. long, 1-1.5 mm. wide, chestnut-brown becoming yellowish and pulverulent by germination, surrounded by the ruptured epidermis; teliospores 2-celled, narrowly ellipsoid, 15-I9 μ by 39-50 μ, rounded both at apex andbase, slightly or not constricted at the septum; wall pale cinnamon-brown, 1-1.5 μ thick, smooth; pedicel hyaline, very long, 3-6 μ in diameter; germ pores 2, near the septum. (pg 503)

This species is morphologically very similar to Gymnosporangium juniperi-virginianae, but there are some constant differences in the shape of the spore masses and galls. The spore masses are darker, shorter, and more conical, while the galls have a peculiar brownish luster. (pg 504)