Aeciospores measure:
(22.3) 22.9 - 26 (26.5) × (19.8) 20 - 21.8 µm
Q = 1.1 - 1.27 (1.3) ; N = 9
Me = 24.3 × 20.7 µm ; Qe = 1.2
Urediniospores measure:
(40.3) 40.33 - 48.09 (48.1) × 19.6 - 23.66 (23.7) µm
Q = 1.9 - 2.1 ; N = 4
Me = 43.4 × 21.9 µm ; Qe = 2
Growing on fallen birch tree
Not certain on ID, will return soon at night to check bioluminescence.