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found growing gregariously on wood chips

spores and cystidia shown at 400X magnification. spores are globose asymmetric to ovate asymmetric to lemon shaped and 8 to 9 microns tall and 7.5 to 8 microns wide. cystidia are about 15 microns tall and distinctly ovoid shaped.

rationale for identification: aborted pins are blue and more mature fruiting bodies bruise blue when damaged. brown color and staining indicate that it is the genus Psilocybe, and the thin cortina present on individuals with unopened caps as well as ovoid cystidia indicate that it is P. ovoideocystidiata.

Micro done by: Scott Ostuni

Basidia N=12
22.81 x 8.67
23.73 x 8.48
20.74 x 7.34
22.65 x 10.48
28.63 x 9.86
28.64 x 9.14
26.01 x 8.42
29.46 x 7.39
23.87 x 9.12
18.65 x 9.71
27.52 x 11.12
17.11 x 8.18

Pleurocystidia N=12

44.37 x 22.60
53.07 x 26.74
49.33 x 23.16
71.69 x 26.85
61.53 x 28.06
53.85 x 33.44
57.34 x 22.58
68.56 x 29.36
54.49 x 32.36
47.77 x 23.24
60.79 x 28.57
56.41 x 24.91

Cheilocystidia N=12

51.35 x 19.28
47.02 x 18.46
50.68 x 18.71
45.73 x 13.82
47.43 x 20.56
50.70 x 17.46
63.05 x 17.87
48.61 x 16.91
69.51 x 23.36
51.54 x 13.47
54.98 x 19.74
52.90 x 15.94

Collected by Bill Sheehan. Growing on wood in mixed forest. Surfaces slowly bruising yellow-brown. Associated with a white rot. Spines up to 2.2 mm long. Odor not distinctive. No reaction with 10% FeSO4 on surfaces. Monomitic with clamps. Fusiform gloeocystidia present. Basidia 4-sterigmate. Spores amyloid. hyaline and smooth. Spore measurements: (3.6) 3.7 – 4.8 (5.4) × (2.9) 3.1 – 3.8 (3.9) µm; Q = (1) 1.1 – 1.3 (1.4); N = 30; Me = 4.2 × 3.4 µm; Qe = 1.2

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Additional notes for sequences (bases on the right):

ITS:

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Originally posted to Mushroom Observer on Oct. 30, 2021.