On dead fallen branch of Acer spicatum growing at edge of a forest of Picea rubens and Abies balsamea

Basidiospores 5.0-6.1 x 2.7-3.5 µm, Q = 1.64-1.94

New Brunswick Museum (NBM)

Photos:

1. Basidioma on dead branch of mountain maple
2. Cross section of the basidioma in KOH showing the gloeocystidia embedded below the hymenium
3. Gloeocystidia in KOH + Congo Red
4. Clamp connections in KOH + Congo Red
5. Basidiospores from spore print in Melzer's Solution

Collected during the Ohio Mushroom Society’s 2019 summer foray. Growing on a Fagus grandifolia (?) stick with Loweomyces fractipes. Associated with a white rot. Monomitic with clamped generartive hyphae. Large, smooth gloeocystidia present. Hyphidia absent. Basidia terminal and cylindrical to clavate. Sterigmata difficult to view. Spores amyloid, smooth and thin-walled. Spore measurements: (4.3) 4.6 – 5.7 (6.8) × (2.3) 2.4 – 3 (3.4) µm, Q = (1.6) 1.8 – 2.1 (2.2); N = 30, Me = 5.2 × 2.7 µm; Qe = 1.9